{"id":96,"date":"2026-09-14T11:56:21","date_gmt":"2026-09-14T02:56:21","guid":{"rendered":"https:\/\/kbeautyledger.com\/?p=96"},"modified":"2026-10-15T12:54:18","modified_gmt":"2026-10-15T03:54:18","slug":"retinol-vs-retinal-evidence-how-to-choose","status":"publish","type":"post","link":"https:\/\/kbeautyledger.com\/ko\/retinol-vs-retinal-evidence-how-to-choose\/","title":{"rendered":"\ub808\ud2f0\ub180 vs \ub808\ud2f0\ub0a0: \ucc28\uc774\uc640 \uc120\ud0dd \uae30\uc900"},"content":{"rendered":"<p><script>document.body.classList.toggle(\"kbl-ko\",\/^\\\/ko(?:\\\/|$)\/.test(location.pathname));<\/script><\/p>\n<style>\nbody.postid-96 .entry-header,body.postid-96 .article-post-thumbnail{display:none}body.postid-96 #primary{margin-top:0;margin-bottom:0}body.postid-96 .content-container.site-container{max-width:none!important;padding:0!important}body.postid-96 .content-wrap,body.postid-96 #post-96{width:100%;max-width:none;background:transparent}body.postid-96 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.rr-market,.rr .rr-outcome-grid,.rr .rr-use-grid,.rr .rr-people{grid-template-columns:1fr}.rr .rr-path{grid-template-columns:1fr 34px 1fr 34px 1fr}.rr .rr-path.retinal{grid-template-columns:1fr 34px 1fr}.rr .rr-pathway{padding:22px 16px}.rr .rr-node{padding:12px 6px;font-size:12px}.rr .rr-bar-row{grid-template-columns:108px 1fr 58px;gap:8px}.rr .rr-axis{margin-left:116px;margin-right:66px}.rr .rr-chart{padding:18px 14px}.rr .rr-chart-head{display:block}.rr .rr-chart-note{text-align:left;margin-top:5px}}\n    @media(max-width:480px){.rr-brand{font-size:19px}.rr-lang button{padding:6px 8px;font-size:11px}.rr .rr-dek{font-size:17px}.rr .rr-lead{font-size:22px}.rr .rr-pathway-head{display:block}.rr .rr-motion-toggle{margin-top:12px}.rr .rr-reg-row{grid-template-columns:1fr;gap:3px}.rr .rr-bar-row{grid-template-columns:90px 1fr 52px;font-size:12px}.rr .rr-axis{margin-left:98px;margin-right:60px}}\n    @media(prefers-reduced-motion:reduce){.rr .rr-pulse{animation:none}}\n<\/style>\n<div class=\"kbl-post-main rr\">\n<section class=\"rr-hero\">\n<div class=\"rr-shell rr-hero-grid\">\n<div>\n<div class=\"rr-eyebrow\">\n<span class=\"inline\" data-lang=\"en\">Ingredient evidence report<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc131\ubd84 \uadfc\uac70 \ub9ac\ud3ec\ud2b8<\/span>\n<\/div>\n<h1><span data-lang=\"en\">Retinol vs retinal:<br \/>differences &amp; how to choose<\/span><span data-lang=\"ko\">\ub808\ud2f0\ub180 vs \ub808\ud2f0\ub0a0,<br \/>\ucc28\uc774\uc640 \uc120\ud0dd \uae30\uc900<\/span><\/h1>\n<p class=\"rr-dek\" data-lang=\"en\">Retinol has the broader human evidence base; retinal is not automatically stronger or gentler. Compare tested concentrations, irritation and the finished formula before choosing.<\/p>\n<p class=\"rr-dek\" data-lang=\"ko\">\ub808\ud2f0\ub180\uc740 \ub354 \ud3ed\ub113\uc740 \uc778\uccb4\uc2dc\ud5d8 \uadfc\uac70\uac00 \uc788\uace0, \ub808\ud2f0\ub0a0\uc774 \uc5b8\uc81c\ub098 \ub354 \uac15\ud558\uac70\ub098 \uc21c\ud55c \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4. \uc5f0\uad6c \ub18d\ub3c4, \uc790\uadf9 \uac00\ub2a5\uc131\uacfc \uc644\uc81c\ud488\uc758 \uc81c\ud615\uc744 \ube44\uad50\ud574 \uc120\ud0dd\ud558\uc138\uc694.<\/p>\n<p class=\"rr-dek\" data-lang=\"en\">Put the comparison into practice: <a href=\"https:\/\/kbeautyledger.com\/dr-different-retinal-1000-signature-cream-review\/\">Dr. Different Retinal 1000 formula report<\/a> \u00b7 <a href=\"https:\/\/kbeautyledger.com\/retinol-moisturizer-sandwich-method-evidence\/\">Retinol and moisturizer order<\/a>.<\/p>\n<p class=\"rr-dek\" data-lang=\"ko\">\uc81c\ud488\uacfc \uc0ac\uc6a9 \uc21c\uc11c\uae4c\uc9c0 \ud655\uc778\ud558\ub824\uba74: <a href=\"https:\/\/kbeautyledger.com\/ko\/dr-different-retinal-1000-signature-cream-review\/\">\ub2e5\ud130\ub514\ud37c\ub7f0\ud2b8 \ub808\ud2f0\ub0a0 1000 \ucc98\ubc29 \ub9ac\ud3ec\ud2b8<\/a> \u00b7 <a href=\"https:\/\/kbeautyledger.com\/ko\/retinol-moisturizer-sandwich-method-evidence\/\">\ub808\ud2f0\ub180\u00b7\ubcf4\uc2b5\uc81c \uc0ac\uc6a9 \uc21c\uc11c<\/a>.<\/p>\n<div class=\"rr-keywords\">\n<span class=\"rr-keyword\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Fine lines<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc794\uc8fc\ub984<\/span><br \/>\n<\/span><br \/>\n<span class=\"rr-keyword\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Texture<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud53c\ubd80\uacb0<\/span><br \/>\n<\/span><br \/>\n<span class=\"rr-keyword\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Pigment marks<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc0c9\uc18c \ud754\uc801<\/span><br \/>\n<\/span><br \/>\n<span class=\"rr-keyword\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Tolerance<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc790\uadf9\u00b7\uc801\uc751<\/span><br \/>\n<\/span><br \/>\n<span class=\"rr-keyword\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Night routine<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc800\ub141 \ub8e8\ud2f4<\/span><br \/>\n<\/span>\n<\/div>\n<\/div>\n<figure class=\"rr-hero-visual\">\n<div>\n<img src=\"https:\/\/kbeautyledger.com\/wp-content\/uploads\/2026\/09\/retinol-retinal-evidence-featured.jpg\" width=\"1536\" height=\"1024\" loading=\"eager\" fetchpriority=\"high\" decoding=\"async\" alt=\"Balanced scientific editorial illustration comparing retinol and retinal pathways above a skin cross-section\">\n<\/div>\n<\/figure>\n<\/div>\n<\/section>\n<div class=\"rr-strip\">\n<div class=\"rr-shell rr-strip-grid\">\n<div class=\"rr-strip-item\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Evidence scope<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uac80\ud1a0 \ubc94\uc704<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Human trials + official regulation<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc778\uccb4\uc2dc\ud5d8\uacfc \uacf5\uc2dd \uaddc\uc815<\/span><br \/>\n<\/strong>\n<\/div>\n<div class=\"rr-strip-item\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Direct comparison<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc9c1\uc811 \ube44\uad50<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">One small 8-week split-face study<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc18c\uaddc\ubaa8 8\uc8fc \ubd84\ud560 \uc548\uba74 \uc5f0\uad6c 1\uac74<\/span><br \/>\n<\/strong>\n<\/div>\n<div class=\"rr-strip-item\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Important<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\uc758<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Cosmetic information\u2014not medical advice<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud654\uc7a5\ud488 \uc815\ubcf4\uc774\uba70 \uc758\ud559\uc801 \uc870\uc5b8\uc774 \uc544\ub2d8<\/span><br \/>\n<\/strong>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-shell rr-layout\">\n<aside class=\"rr-toc\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">On this page<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubaa9\ucc28<\/span><br \/>\n<\/strong><br \/>\n<a href=\"#summary\"><br \/>\n<span class=\"inline\" data-lang=\"en\">30-second answer<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">30\ucd08 \ud575\uc2ec \uc694\uc57d<\/span><br \/>\n<\/a><br \/>\n<a href=\"#choose\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Which should I choose?<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubb34\uc5c7\uc744 \uace0\ub97c\uae4c<\/span><br \/>\n<\/a><br \/>\n<a href=\"#brands\"><br \/>\n<span class=\"inline\" data-lang=\"en\">How brands use them<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ube0c\ub79c\ub4dc\uac00 \uc4f0\ub294 \ubc29\uc2dd<\/span><br \/>\n<\/a><br \/>\n<a href=\"#mechanism\"><br \/>\n<span class=\"inline\" data-lang=\"en\">How conversion works<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud53c\ubd80\uc5d0\uc11c \ubc14\ub00c\ub294 \uacfc\uc815<\/span><br \/>\n<\/a><br \/>\n<a href=\"#evidence\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Human evidence<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc778\uccb4\uc2dc\ud5d8 \uadfc\uac70<\/span><br \/>\n<\/a><br \/>\n<a href=\"#change\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Before and after data<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc0ac\uc6a9 \uc804\ud6c4 \uc790\ub8cc<\/span><br \/>\n<\/a><br \/>\n<a href=\"#use\"><br \/>\n<span class=\"inline\" data-lang=\"en\">How to start<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc0ac\uc6a9 \uc2dc\uc791\ubc95<\/span><br \/>\n<\/a><br \/>\n<a href=\"#safety\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Safety &amp; pregnancy<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\uc758 \ub300\uc0c1<\/span><br \/>\n<\/a><br \/>\n<a href=\"#refs\"><br \/>\n<span class=\"inline\" data-lang=\"en\">References<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucc38\uace0\ubb38\ud5cc<\/span><br \/>\n<\/a><br \/>\n<\/aside>\n<article>\n<section id=\"summary\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">30-second answer<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">30\ucd08 \ud575\uc2ec \uc694\uc57d<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">The honest answer:<br \/>there is no universal winner<\/span><br \/>\n<span data-lang=\"ko\">\uacb0\ub860\ubd80\ud130 \ub9d0\ud558\uba74,<br \/>\ubb34\uc870\uac74 \ub354 \uc88b\uc740 \ucabd\uc740 \uc5c6\ub2e4<\/span><br \/>\n<\/h2>\n<div class=\"rr-summary\">\n<div class=\"rr-verdict\">\n<div class=\"rr-lead\" data-lang=\"en\">Retinol has the broader and longer human evidence base. Retinal has promising trials\u2014including one direct comparison\u2014but the evidence is smaller and formulation-dependent.<\/div>\n<div class=\"rr-lead\" data-lang=\"ko\">\ub808\ud2f0\ub180\uc740 \ub354 \uc624\ub798, \ub354 \ub2e4\uc591\ud55c \uc778\uccb4\uc2dc\ud5d8\uc73c\ub85c \uc5f0\uad6c\ub410\ub2e4. \ub808\ud2f0\ub0a0\ub3c4 \uac00\ub2a5\uc131\uc744 \ubcf4\uc5ec\uc900 \uc2dc\ud5d8\uc774 \uc788\uc9c0\ub9cc \uc790\ub8cc \uc218\uac00 \uc801\uace0 \uc81c\ud615\uc758 \uc601\ud5a5\uc744 \ub9ce\uc774 \ubc1b\ub294\ub2e4.<\/div>\n<p data-lang=\"en\">For visible fine lines, texture and uneven pigment, either can be a reasonable cosmetic option. The better purchase is usually the product with a disclosed concentration, protective packaging, clear instructions and a formula your skin can use consistently\u2014not the one with the louder potency claim.<\/p>\n<p data-lang=\"ko\">\uc794\uc8fc\ub984\uacfc \ud53c\ubd80\uacb0, \uace0\ub974\uc9c0 \ubabb\ud55c \uc0c9\uc18c \ud754\uc801\uc744 \uad00\ub9ac\ud558\ub824\uba74 \ub458 \ub2e4 \uc120\ud0dd\uc9c0\uac00 \ub420 \uc218 \uc788\ub2e4. \ub2e4\ub9cc \u2018\ub354 \uac15\ud558\ub2e4\u2019\ub294 \uad11\uace0\ubcf4\ub2e4 \ub18d\ub3c4\ub97c \uacf5\uac1c\ud588\ub294\uc9c0, \ube5b\uacfc \uacf5\uae30\ub97c \ub9c9\ub294 \uc6a9\uae30\uc778\uc9c0, \uc0ac\uc6a9\ubc95\uc774 \uad6c\uccb4\uc801\uc778\uc9c0, \ub0b4 \ud53c\ubd80\uac00 \uafb8\uc900\ud788 \uc4f8 \uc218 \uc788\ub294\uc9c0\ub97c \uba3c\uc800 \ubcf4\uc790.<\/p>\n<\/div>\n<div class=\"rr-facts\">\n<div class=\"rr-fact\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Retinol studied<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub808\ud2f0\ub180 \uc5f0\uad6c \ub18d\ub3c4<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">0.1%\u20130.4% in selected human trials<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc77c\ubd80 \uc778\uccb4\uc2dc\ud5d8\uc5d0\uc11c 0.1~0.4%<\/span><br \/>\n<\/strong>\n<\/div>\n<div class=\"rr-fact\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Retinal studied<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub808\ud2f0\ub0a0 \uc5f0\uad6c \ub18d\ub3c4<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">0.05%\u20130.1% in the most useful facial trials<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\uc694 \uc5bc\uad74 \uc2dc\ud5d8\uc5d0\uc11c 0.05~0.1%<\/span><br \/>\n<\/strong>\n<\/div>\n<div class=\"rr-fact\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">When assessed<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubcc0\ud654\ub97c \uc0b4\ud540 \uc2dc\uc810<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Mostly 8\u201324 weeks; one retinol study continued 52 weeks<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\ub85c 8~24\uc8fc, \ub808\ud2f0\ub180 \uc5f0\uad6c 1\uac74\uc740 52\uc8fc<\/span><br \/>\n<\/strong>\n<\/div>\n<div class=\"rr-fact\">\n<small><br \/>\n<span class=\"inline\" data-lang=\"en\">Not established<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud655\uc778\ub418\uc9c0 \uc54a\uc740 \uc8fc\uc7a5<\/span><br \/>\n<\/small><br \/>\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">No universal potency ratio or equivalent-dose table<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubcf4\ud3b8\uc801\uc778 \u2018\uba87 \ubc30 \uac15\ud568\u2019 \ub610\ub294 \ub3d9\ub4f1 \ub18d\ub3c4\ud45c<\/span><br \/>\n<\/strong>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-note\" data-lang=\"en\">\n<strong>Plain-language rule:<\/strong> If you are new to vitamin A skincare, do not choose by the biggest number. Choose one product, follow its label, start slowly and judge tolerability before frequency. Study concentrations and timepoints are descriptions of particular formulas\u2014not a personal dose or a promised deadline.<\/div>\n<div class=\"rr-note\" data-lang=\"ko\">\n<strong>\uc27d\uac8c \uae30\uc5b5\ud558\uba74:<\/strong> \ube44\ud0c0\ubbfc A \ud654\uc7a5\ud488\uc774 \ucc98\uc74c\uc774\ub77c\uba74 \uc22b\uc790\uac00 \ud070 \uc81c\ud488\ubd80\ud130 \uace0\ub974\uc9c0 \uc54a\ub294\ub2e4. \uc81c\ud488 \ud558\ub098\ub9cc \uc120\ud0dd\ud574 \ud45c\uc2dc\ub41c \uc0ac\uc6a9\ubc95\uc744 \ub530\ub974\uace0, \uc0ac\uc6a9 \ud69f\uc218\ub97c \ub298\ub9ac\uae30 \uc804\uc5d0 \ud53c\ubd80\uac00 \uacac\ub514\ub294\uc9c0 \uba3c\uc800 \ubcf8\ub2e4. \ub17c\ubb38 \uc18d \ub18d\ub3c4\uc640 \uae30\uac04\uc740 \uadf8 \uc81c\ud615\uc758 \uc2dc\ud5d8 \uc870\uac74\uc77c \ubfd0, \uac1c\uc778\uc5d0\uac8c \uad8c\ud558\ub294 \uc6a9\ub7c9\uc774\ub098 \ud6a8\uacfc \ubcf4\uc7a5 \uc2dc\uc810\uc774 \uc544\ub2c8\ub2e4.<\/div>\n<\/section>\n<section id=\"choose\" class=\"rr-section\">\n<h2>\n<span data-lang=\"en\">Choose by evidence,<br \/>formula and tolerance<\/span><br \/>\n<span data-lang=\"ko\">\uc131\ubd84 \uc774\ub984\ubcf4\ub2e4<br \/>\uadfc\uac70\u00b7\uc81c\ud615\u00b7\uc801\uc751\ub3c4\ub97c \ubcf4\uc790<\/span><br \/>\n<\/h2>\n<div class=\"rr-choice\">\n<div class=\"rr-choice-card\">\n<div class=\"rr-formula\">Retinol<\/div>\n<p data-lang=\"en\">A sensible first choice when you want the better-established cosmetic evidence base and a product that clearly states its strength and stability strategy.<\/p>\n<p data-lang=\"ko\">\uc778\uccb4\uc2dc\ud5d8\uc774 \ube44\uad50\uc801 \ub9ce\uc774 \ucd95\uc801\ub41c \uc131\ubd84\uc744 \uc6d0\ud558\uace0, \ub18d\ub3c4\uc640 \uc548\uc815\ud654 \ubc29\uc2dd\uc774 \uba85\ud655\ud55c \uc81c\ud488\uc744 \ucc3e\uc558\ub2e4\uba74 \uc6b0\uc120 \uace0\ub824\ud560 \uc218 \uc788\ub2e4.<\/p>\n<dl>\n<dt>\n<span class=\"inline\" data-lang=\"en\">Evidence advantage<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uadfc\uac70\uc0c1\uc758 \uc7a5\uc810<\/span>\n<\/dt>\n<dd>\n<span class=\"inline\" data-lang=\"en\">Vehicle-controlled trials from 8 to 52 weeks<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">8~52\uc8fc \ub300\uc870\uc2dc\ud5d8 \uc790\ub8cc\uac00 \uc788\uc74c<\/span>\n<\/dd>\n<dt>\n<span class=\"inline\" data-lang=\"en\">Practical weakness<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc2e4\uc0ac\uc6a9 \uc57d\uc810<\/span>\n<\/dt>\n<dd>\n<span class=\"inline\" data-lang=\"en\">Unstable unless protected in the final formula<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc644\uc81c\ud488\uc5d0\uc11c \uc548\uc815\ud654\ud558\uc9c0 \uc54a\uc73c\uba74 \ud488\uc9c8 \uc720\uc9c0\uac00 \uc5b4\ub824\uc6c0<\/span>\n<\/dd>\n<\/dl>\n<\/div>\n<div class=\"rr-choice-card retinal\">\n<div class=\"rr-formula\">Retinal<\/div>\n<p data-lang=\"en\">A reasonable option when a well-described, protected formula is available and you accept that the human evidence base\u2014and independent replication\u2014is smaller.<\/p>\n<p data-lang=\"ko\">\ub18d\ub3c4\uc640 \uc804\ub2ec \uae30\uc220\uc774 \uad6c\uccb4\uc801\uc73c\ub85c \uacf5\uac1c\ub41c \uc81c\ud488\uc744 \ucc3e\uc558\uace0, \ub808\ud2f0\ub180\ubcf4\ub2e4 \ub3c5\ub9bd\uc801\uc778 \ubc18\ubcf5 \uc5f0\uad6c\uac00 \uc801\ub2e4\ub294 \ud55c\uacc4\ub97c \uc774\ud574\ud55c\ub2e4\uba74 \uc120\ud0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n<dl>\n<dt>\n<span class=\"inline\" data-lang=\"en\">Evidence advantage<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uadfc\uac70\uc0c1\uc758 \uc7a5\uc810<\/span>\n<\/dt>\n<dd>\n<span class=\"inline\" data-lang=\"en\">0.05% and 0.1% facial trials; one small direct study<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">0.05\u00b70.1% \uc5bc\uad74 \uc2dc\ud5d8\uacfc \uc18c\uaddc\ubaa8 \uc9c1\uc811 \ube44\uad50 1\uac74<\/span>\n<\/dd>\n<dt>\n<span class=\"inline\" data-lang=\"en\">Evidence weakness<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uadfc\uac70\uc0c1\uc758 \uc57d\uc810<\/span>\n<\/dt>\n<dd>\n<span class=\"inline\" data-lang=\"en\">Fewer trials; delivery systems confound comparison<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc5f0\uad6c \uc218\uac00 \uc801\uace0 \uc804\ub2ec \uc81c\ud615\uc758 \uc601\ud5a5\uc744 \ubd84\ub9ac\ud558\uae30 \uc5b4\ub824\uc6c0<\/span>\n<\/dd>\n<\/dl>\n<\/div>\n<\/div>\n<div class=\"rr-bottom-line\" data-lang=\"en\">If one option repeatedly causes burning, persistent redness or peeling, theoretical potency does not make it the better option for you.<\/div>\n<div class=\"rr-bottom-line\" data-lang=\"ko\">\ud654\ub048\uac70\ub9bc\uc774\ub098 \ubd89\uc5b4\uc9d0, \uac01\uc9c8\uc774 \uacc4\uc18d\ub41c\ub2e4\uba74 \uc774\ub860\uc0c1 \uac15\ud55c \uc131\ubd84\uc774\ub77c\ub3c4 \ub098\uc5d0\uac8c \ub354 \uc88b\uc740 \uc120\ud0dd\uc740 \uc544\ub2c8\ub2e4.<\/div>\n<\/section>\n<section id=\"brands\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Market and regulation<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc2dc\uc7a5\uacfc \uaddc\uc815<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">Why brands choose<br \/>one name over the other<\/span><br \/>\n<span data-lang=\"ko\">\ube0c\ub79c\ub4dc\ub294 \uc65c<br \/>\ub458 \uc911 \ud558\ub098\ub97c \ud0dd\ud560\uae4c?<\/span><br \/>\n<\/h2>\n<div class=\"rr-market\">\n<div class=\"rr-market-panel\">\n<h3>\n<span class=\"inline\" data-lang=\"en\">Common product-development logic<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc81c\ud488\uc744 \uc124\uacc4\ud560 \ub54c\uc758 \ud604\uc2e4\uc801\uc778 \uc774\uc720<\/span><br \/>\n<\/h3>\n<ol data-lang=\"en\">\n<li>\n<strong>Retinol:<\/strong> recognizable to consumers, backed by more human trials, and compatible with familiar strength ladders\u2014but it requires stabilization.<\/li>\n<li>\n<strong>Retinal:<\/strong> supports a \u201cone conversion step\u201d story and low-number positioning, but the formula and delivery system are part of the evidence\u2014not a footnote.<\/li>\n<li>\n<strong>Both:<\/strong> benefit from light- and air-protective packaging. A percentage alone cannot reveal how much active remains through shelf life.<\/li>\n<\/ol>\n<ol data-lang=\"ko\">\n<li>\n<strong>\ub808\ud2f0\ub180:<\/strong> \uc18c\ube44\uc790 \uc778\uc9c0\ub3c4\uac00 \ub192\uace0 \uc778\uccb4\uc2dc\ud5d8\uc774 \ub354 \ub9ce\uc544 \ub2e8\uacc4\ubcc4 \ub18d\ub3c4 \uc81c\ud488\uc744 \uad6c\uc131\ud558\uae30 \uc27d\ub2e4. \ub300\uc2e0 \uc548\uc815\ud654\uac00 \ud575\uc2ec \uacfc\uc81c\ub2e4.<\/li>\n<li>\n<strong>\ub808\ud2f0\ub0a0:<\/strong> \u2018\ud65c\uc131\ud615\uae4c\uc9c0 \ud55c \ub2e8\uacc4\u2019\ub77c\ub294 \uc124\uba85\uacfc \ub0ae\uc740 \uc22b\uc790\uc758 \ub18d\ub3c4\ub97c \ub0b4\uc138\uc6b0\uae30 \uc88b\ub2e4. \uadf8\ub7ec\ub098 \uc804\ub2ec \uae30\uc220\uc774 \uc2dc\ud5d8 \uacb0\uacfc\uc5d0 \uc601\ud5a5\uc744 \uc8fc\ubbc0\ub85c \uc131\ubd84 \uc774\ub984\ub9cc \ub5bc\uc5b4 \ube44\uad50\ud558\uba74 \uc548 \ub41c\ub2e4.<\/li>\n<li>\n<strong>\uacf5\ud1b5:<\/strong> \ube5b\uacfc \uacf5\uae30\ub97c \ub9c9\ub294 \uc6a9\uae30\uac00 \uc911\uc694\ud558\ub2e4. \ud45c\uc2dc \ub18d\ub3c4\ub9cc\uc73c\ub85c \uc720\ud1b5\uae30\ud55c \ub3d9\uc548 \uc2e4\uc81c \ud65c\uc131 \uc131\ubd84\uc774 \uc5bc\ub9c8\ub098 \ub0a8\ub294\uc9c0\ub294 \uc54c \uc218 \uc5c6\ub2e4.<\/li>\n<\/ol>\n<\/div>\n<div class=\"rr-reg\">\n<div class=\"rr-reg-row\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">South Korea<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud55c\uad6d<\/span><br \/>\n<\/strong><\/p>\n<div data-lang=\"en\">The current functional-cosmetics codex contains retinol raw-material and finished-product monographs. The notified wrinkle-improvement route commonly cited for retinol is 2,500 IU\/g. Retinal is not named in that codex list, so a retinal product&#8217;s claim route cannot be inferred from retinol&#8217;s entry.<\/div>\n<div data-lang=\"ko\">\ud604\ud589 \uae30\ub2a5\uc131\ud654\uc7a5\ud488 \uae30\uc900\uc5d0\ub294 \ub808\ud2f0\ub180 \uc6d0\ub8cc\uc640 \uc644\uc81c\ud488 \uac01\uc870\uac00 \uc788\ub2e4. \ub808\ud2f0\ub180\uc740 2,500 IU\/g\uc774 \uc8fc\ub984\uac1c\uc120 \uace0\uc2dc \ud568\ub7c9\uc73c\ub85c \uc4f0\uc778\ub2e4. \ub808\ud2f0\ub0a0\uc740 \uac19\uc740 \ubaa9\ub85d\uc5d0 \uba85\uc2dc\ub3fc \uc788\uc9c0 \uc54a\uc73c\ubbc0\ub85c, \ub808\ud2f0\ub180\uc758 \ubcf4\uace0 \uacbd\ub85c\ub97c \ub808\ud2f0\ub0a0 \uc81c\ud488\uc5d0 \uadf8\ub300\ub85c \uc801\uc6a9\ud560 \uc218 \uc788\ub2e4\uace0 \ub2e8\uc815\ud558\uba74 \uc548 \ub41c\ub2e4.<\/div>\n<\/div>\n<div class=\"rr-reg-row\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">European Union<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc720\ub7fd\uc5f0\ud569<\/span><br \/>\n<\/strong><\/p>\n<div data-lang=\"en\">Regulation (EU) 2024\/996 limits retinol and named retinyl esters to 0.3% retinol equivalent in most leave-on\/rinse-off products and 0.05% in body lotion, with transition dates. Retinal was not assessed in the SCCS vitamin A opinion because specific applicant data were not provided.<\/div>\n<div data-lang=\"ko\">EU \uaddc\uc815 2024\/996\uc740 \ub808\ud2f0\ub180\uacfc \uc77c\ubd80 \ub808\ud2f0\ub2d0 \uc5d0\uc2a4\ud130\ub97c \ub300\ubd80\ubd84\uc758 \ubc14\ub974\ub294\u00b7\uc53b\uc5b4\ub0b4\ub294 \uc81c\ud488\uc5d0\uc11c \ub808\ud2f0\ub180 \ud658\uc0b0 0.3%, \ubc14\ub514\ub85c\uc158\uc5d0\uc11c 0.05%\ub85c \uc81c\ud55c\ud558\uba70 \uacbd\uacfc\uae30\uac04\uc744 \ub450\uace0 \uc801\uc6a9\ud55c\ub2e4. \ub808\ud2f0\ub0a0\uc740 \uc2e0\uccad\uc790\uac00 \ubcc4\ub3c4 \uc790\ub8cc\ub97c \uc81c\ucd9c\ud558\uc9c0 \uc54a\uc544 SCCS \ube44\ud0c0\ubbfc A \ud3c9\uac00 \ub300\uc0c1\uc5d0 \ud3ec\ud568\ub418\uc9c0 \uc54a\uc558\ub2e4.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-warning\" data-lang=\"en\">\n<strong>Do not compare labels mechanically:<\/strong> using the NIH conversion of 1 IU retinol = 0.3 \u03bcg RAE, 2,500 IU\/g corresponds arithmetically to 0.075% retinol. That conversion alone does not establish equivalence between Korean functional-reporting criteria, an overseas percentage label, bioavailability or clinical performance.<\/div>\n<div class=\"rr-warning\" data-lang=\"ko\">\n<strong>\ub77c\ubca8 \uc22b\uc790\ub97c \uae30\uacc4\uc801\uc73c\ub85c \ube44\uad50\ud558\uba74 \uc548 \ub41c\ub2e4:<\/strong> \ubbf8\uad6d \uad6d\ub9bd\ubcf4\uac74\uc6d0 \ud658\uc0b0\uc2dd\uc778 \ub808\ud2f0\ub180 1 IU = 0.3 \u03bcg RAE\ub97c \uc801\uc6a9\ud558\uba74 2,500 IU\/g\uc740 \uacc4\uc0b0\uc0c1 \ub808\ud2f0\ub180 0.075%\uc5d0 \ud574\ub2f9\ud55c\ub2e4. \uadf8\ub7ec\ub098 \uc774 \uacc4\uc0b0\ub9cc\uc73c\ub85c \uad6d\ub0b4 \uae30\ub2a5\uc131 \ubcf4\uace0 \uae30\uc900\uacfc \ud574\uc678 \ud37c\uc13c\ud2b8 \ud45c\uae30, \ud761\uc218\uc728, \uc2e4\uc81c \ud6a8\ub2a5\uc774 \uc11c\ub85c \uac19\ub2e4\uace0 \ubcfc \uc218\ub294 \uc5c6\ub2e4.<\/div>\n<\/section>\n<section id=\"mechanism\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Mechanism without the hype<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uacfc\uc7a5 \uc5c6\uc774 \ubcf4\ub294 \uc791\ub3d9 \uacbd\ub85c<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">One fewer conversion step<br \/>is not a potency equation<\/span><br \/>\n<span data-lang=\"ko\">\uc804\ud658 \ub2e8\uacc4\uac00 \ud558\ub098 \uc801\ub2e4\uace0<br \/>\ud6a8\ub2a5 \ubc30\uc218\uac00 \uc815\ud574\uc9c0\uc9c4 \uc54a\ub294\ub2e4<\/span><br \/>\n<\/h2>\n<div class=\"rr-pathway\" aria-label=\"Retinol and retinal conversion pathways\">\n<div class=\"rr-pathway-head\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Simplified cutaneous conversion<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud53c\ubd80 \ub0b4 \uc804\ud658 \uacfc\uc815\uc744 \ub2e8\uc21c\ud654\ud55c \uadf8\ub9bc<\/span><br \/>\n<\/strong><br \/>\n<button class=\"rr-motion-toggle\" type=\"button\" aria-pressed=\"false\"><br \/>\n<span class=\"inline\" data-lang=\"en\">Pause motion<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubaa8\uc158 \uba48\ucda4<\/span><br \/>\n<\/button>\n<\/div>\n<div class=\"rr-paths\">\n<div class=\"rr-path\">\n<div class=\"rr-node\">\n<small><span class=\"inline\" data-lang=\"en\">Starting form<\/span><span class=\"inline\" data-lang=\"ko\">\uc2dc\uc791 \uc131\ubd84<\/span><\/small>Retinol<\/div>\n<div class=\"rr-arrow\">\n<span class=\"rr-pulse\"><br \/>\n<\/span>\n<\/div>\n<div class=\"rr-node\">\n<small><span class=\"inline\" data-lang=\"en\">Intermediate<\/span><span class=\"inline\" data-lang=\"ko\">\uc911\uac04 \ub2e8\uacc4<\/span><\/small>Retinaldehyde<\/div>\n<div class=\"rr-arrow\">\n<span class=\"rr-pulse\"><br \/>\n<\/span>\n<\/div>\n<div class=\"rr-node\">\n<small><span class=\"inline\" data-lang=\"en\">Receptor-active form<\/span><span class=\"inline\" data-lang=\"ko\">\uc218\uc6a9\uccb4 \ud65c\uc131\ud615<\/span><\/small>Retinoic acid<\/div>\n<\/div>\n<div class=\"rr-path retinal\">\n<div class=\"rr-node\">\n<small><span class=\"inline\" data-lang=\"en\">Starting form<\/span><span class=\"inline\" data-lang=\"ko\">\uc2dc\uc791 \uc131\ubd84<\/span><\/small>Retinaldehyde<\/div>\n<div class=\"rr-arrow\">\n<span class=\"rr-pulse\"><br \/>\n<\/span>\n<\/div>\n<div class=\"rr-node\">\n<small><span class=\"inline\" data-lang=\"en\">Receptor-active form<\/span><span class=\"inline\" data-lang=\"ko\">\uc218\uc6a9\uccb4 \ud65c\uc131\ud615<\/span><\/small>Retinoic acid<\/div>\n<\/div>\n<\/div>\n<p class=\"rr-path-caption\" data-lang=\"en\">This is a biochemical pathway, not a speedometer. Conversion depends on enzymes, concentration, vehicle, stability, delivery and skin condition. It cannot justify claims such as \u201cretinal is 10\u00d7 or 11\u00d7 stronger\u201d without a validated clinical dose-equivalence study.<\/p>\n<p class=\"rr-path-caption\" data-lang=\"ko\">\uc774 \uadf8\ub9bc\uc740 \uc0dd\ud654\ud559\uc801 \uacbd\ub85c\uc774\uc9c0 \uc18d\ub3c4\uacc4\uac00 \uc544\ub2c8\ub2e4. \uc2e4\uc81c \uc804\ud658\uc740 \ud6a8\uc18c, \ub18d\ub3c4, \ubc14\ud0d5 \uc81c\ud615, \uc548\uc815\uc131, \uc804\ub2ec \ubc29\uc2dd, \ud53c\ubd80 \uc0c1\ud0dc\uc758 \uc601\ud5a5\uc744 \ubc1b\ub294\ub2e4. \uc784\uc0c1\uc801\uc73c\ub85c \ub3d9\ub4f1\ud55c \ub18d\ub3c4\ub97c \uc9c1\uc811 \uac80\uc99d\ud558\uc9c0 \uc54a\uc740 \ucc44 \u2018\ub808\ud2f0\ub0a0\uc774 10\ubc30 \ub610\ub294 11\ubc30 \uac15\ud558\ub2e4\u2019\uace0 \uacb0\ub860 \ub0b4\ub9b4 \uadfc\uac70\ub294 \ub418\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n<\/div>\n<\/section>\n<section id=\"evidence\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Human studies first<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc778\uccb4\uc2dc\ud5d8\ubd80\ud130 \ud655\uc778<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">What was actually<br \/>tested on people<\/span><br \/>\n<span data-lang=\"ko\">\uc0ac\ub78c \ud53c\ubd80\uc5d0\uc11c\ub294<br \/>\ubb34\uc5c7\uc744 \uc2dc\ud5d8\ud588\uc744\uae4c?<\/span><br \/>\n<\/h2>\n<div class=\"rr-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\n<span class=\"inline\" data-lang=\"en\">Study<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc5f0\uad6c<\/span>\n<\/th>\n<th>\n<span class=\"inline\" data-lang=\"en\">Design<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc124\uacc4<\/span>\n<\/th>\n<th>\n<span class=\"inline\" data-lang=\"en\">Observed result<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uad00\ucc30\ub41c \uacb0\uacfc<\/span>\n<\/th>\n<th>\n<span class=\"inline\" data-lang=\"en\">Main limit<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\uc694 \ud55c\uacc4<\/span>\n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<span class=\"rr-badge\">Retinol<\/span><br \/>\n<br \/>Kafi 2007<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">0.4%, up to 3\u00d7 weekly, 24 weeks; randomized arm comparison; 36 very old adults<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">0.4%, \uc8fc 3\ud68c \uc774\ud558, 24\uc8fc; \ubb34\uc791\uc704 \ud314 \ube44\uad50; \uace0\ub839\uc790 36\uba85<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Fine-wrinkle score changed \u22121.64 vs \u22120.08 with vehicle<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc794\uc8fc\ub984 \uc810\uc218 \ubcc0\ud654 \u22121.64, \ubc14\ud0d5 \uc81c\ud615 \u22120.08<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Mean age 87; forearm, not face<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud3c9\uade0 87\uc138, \uc5bc\uad74\uc774 \uc544\ub2cc \ud314 \ud53c\ubd80<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<span class=\"rr-badge\">Retinol<\/span><br \/>\n<br \/>Tucker-Samaras 2009<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Stabilized 0.1%, daily, 8 weeks; double-blind split-face vehicle control<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc548\uc815\ud654 0.1%, \ub9e4\uc77c, 8\uc8fc; \uc774\uc911\ub208\uac00\ub9bc \ubd84\ud560 \uc548\uba74 \ub300\uc870<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Greater improvement than vehicle across assessed photoaging parameters at week 8<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">8\uc8fc\uc5d0 \uc5ec\ub7ec \uad11\ub178\ud654 \ud3c9\uac00 \ud56d\ubaa9\uc5d0\uc11c \ubc14\ud0d5 \uc81c\ud615\ubcf4\ub2e4 \ud070 \ubcc0\ud654<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Author affiliation includes J&amp;J Consumer Companies<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc800\uc790 \uc18c\uc18d\uc5d0 J&amp;J Consumer Companies \ud3ec\ud568<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<span class=\"rr-badge\">Retinal<\/span><br \/>\n<br \/>Kwon 2018<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">0.05% or 0.1%, twice daily, 3 months; randomized double-blind; 40 Korean women<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">0.05% \ub610\ub294 0.1%, \ud558\ub8e8 2\ud68c, 3\uac1c\uc6d4; \ubb34\uc791\uc704 \uc774\uc911\ub208\uac00\ub9bc; \ud55c\uad6d \uc5ec\uc131 40\uba85<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Texture, TEWL and hydration improved in both groups; no significant between-dose difference<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub450 \uad70 \ubaa8\ub450 \ud53c\ubd80\uacb0\u00b7TEWL\u00b7\uc218\ubd84 \uc9c0\ud45c\uac00 \uac1c\uc120\ub410\uc9c0\ub9cc \ub18d\ub3c4 \uac04 \uc720\uc758\ud55c \ucc28\uc774\ub294 \uc5c6\uc74c<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">No vehicle-only group in the abstract; small study<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucd08\ub85d\uc0c1 \ubc14\ud0d5 \uc81c\ud615 \ub2e8\ub3c5\uad70\uc774 \uc5c6\uace0 \ud45c\ubcf8\uc774 \uc791\uc74c<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<span class=\"rr-badge\">Retinal<\/span><br \/>\n<br \/>Deda 2026<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Stabilized 0.1% vs 0.05%, split face, 24 weeks; 56 women aged 30\u201358<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc548\uc815\ud654 \ub808\ud2f0\ub0a0 0.1%\uc640 0.05%, \ubd84\ud560 \uc548\uba74, 24\uc8fc; 30~58\uc138 \uc5ec\uc131 56\uba85<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Wrinkle, dermal-density and elasticity measures improved; several wrinkle measures favored 0.1%<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc8fc\ub984\u00b7\uc9c4\ud53c \ubc00\ub3c4\u00b7\ud0c4\ub825 \uc9c0\ud45c\uac00 \uac1c\uc120\ub410\uace0, \uc77c\ubd80 \uc8fc\ub984 \uc9c0\ud45c\ub294 0.1% \ucabd \ubcc0\ud654\uac00 \ub354 \ucef8\uc74c<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Fixed left\/right assignment; different co-ingredients; no vehicle-only side; one irritation withdrawal<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc88c\uc6b0 \ubc30\uc815\uc774 \uace0\uc815\ub410\uace0 \ubd80\uc131\ubd84\uc774 \ub2ec\ub790\uc73c\uba70 \ubc14\ud0d5 \uc81c\ud615 \ub300\uc870\uac00 \uc5c6\uace0 \uc790\uadf9\uc73c\ub85c 1\uba85\uc774 \uc911\ub2e8<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<span class=\"rr-badge\"><span class=\"inline\" data-lang=\"en\">Head-to-head<\/span><span class=\"inline\" data-lang=\"ko\">\uc9c1\uc811 \ube44\uad50<\/span><\/span><br \/>\n<br \/>Kim 2021<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">MLV-retinal 0.05%\/0.1% vs same-number retinol on opposite face; 8 weeks; 23 Korean volunteers<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub2e4\uce35\uc18c\ud3ec \ub808\ud2f0\ub0a0 0.05%\u00b70.1%\uc640 \uac19\uc740 \uc22b\uc790\uc758 \ub808\ud2f0\ub180\uc744 \uc5bc\uad74 \uc591\ucabd\uc5d0 \uc0ac\uc6a9; 8\uc8fc; \ud55c\uad6d\uc778 23\uba85<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Both sides improved; MLV-retinal side improved more objective measures except dermal density<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc591\ucabd \ubaa8\ub450 \ubcc0\ud654\uac00 \uc788\uc5c8\uace0, \uc9c4\ud53c \ubc00\ub3c4\ub97c \uc81c\uc678\ud55c \uac1d\uad00 \uc9c0\ud45c\ub294 \ub2e4\uce35\uc18c\ud3ec \ub808\ud2f0\ub0a0 \ucabd \ubcc0\ud654\uac00 \ub354 \ud07c<\/span>\n<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Delivery system differs; n=23; equal percentages are not proven equivalent doses<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc804\ub2ec \uc81c\ud615\uc774 \ub2e4\ub974\uace0 23\uba85\ubfd0\uc774\uba70, \uac19\uc740 \ud37c\uc13c\ud2b8\uac00 \ub3d9\ub4f1 \uc6a9\ub7c9\uc778\uc9c0 \uc785\uc99d\ub418\uc9c0 \uc54a\uc74c<\/span>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"rr-note\" data-lang=\"en\">\n<strong>Interpretation:<\/strong> the direct trial supports that one specific multilamellar-vesicle retinal formula performed well against one retinol formula over eight weeks. It does not prove every retinal product is stronger than every retinol product.<\/div>\n<div class=\"rr-note\" data-lang=\"ko\">\n<strong>\ud574\uc11d:<\/strong> \uc9c1\uc811 \ube44\uad50 \uc5f0\uad6c\ub294 \ud2b9\uc815 \ub2e4\uce35\uc18c\ud3ec \ub808\ud2f0\ub0a0 \uc81c\ud615\uc774 \ube44\uad50 \ub300\uc0c1 \ub808\ud2f0\ub180 \uc81c\ud615\ubcf4\ub2e4 8\uc8fc \ub3d9\uc548 \uc77c\ubd80 \uc9c0\ud45c\uc5d0\uc11c \ub354 \ud070 \ubcc0\ud654\ub97c \ubcf4\uc600\ub2e4\ub294 \ub73b\uc774\ub2e4. \ubaa8\ub4e0 \ub808\ud2f0\ub0a0 \uc81c\ud488\uc774 \ubaa8\ub4e0 \ub808\ud2f0\ub180 \uc81c\ud488\ubcf4\ub2e4 \uac15\ud558\ub2e4\ub294 \uc99d\uac70\ub294 \uc544\ub2c8\ub2e4.<\/div>\n<\/section>\n<section id=\"change\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Before-and-after data<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc0ac\uc6a9 \uc804\ud6c4 \uc790\ub8cc<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">Read change as study data,<br \/>not as a personal forecast<\/span><br \/>\n<span data-lang=\"ko\">\uc5f0\uad6c \uc18d \ubcc0\ud654\uc640<br \/>\ub0b4 \uacb0\uacfc\ub97c \uad6c\ubd84\ud574\uc57c \ud55c\ub2e4<\/span><br \/>\n<\/h2>\n<div class=\"rr-chart\" role=\"img\" aria-label=\"Absolute reduction in fine-wrinkle score after 24 weeks in the Kafi 2007 retinol study\">\n<div class=\"rr-chart-head\">\n<div class=\"rr-chart-title\">\n<span class=\"inline\" data-lang=\"en\">24-week fine-wrinkle score reduction<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">24\uc8fc \ud6c4 \uc794\uc8fc\ub984 \uc810\uc218 \uac10\uc18c\ud3ed<\/span>\n<\/div>\n<div class=\"rr-chart-note\">\n<span class=\"inline\" data-lang=\"en\">0\u20139 clinical scale \u00b7 n=36 \u00b7 forearm<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">0~9 \uc784\uc0c1 \ucc99\ub3c4 \u00b7 36\uba85 \u00b7 \ud314 \ud53c\ubd80<\/span>\n<\/div>\n<\/div>\n<div class=\"rr-bar-row\">\n<span><br \/>\n<span class=\"inline\" data-lang=\"en\">0.4% retinol<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub808\ud2f0\ub180 0.4%<\/span><br \/>\n<\/span><\/p>\n<div class=\"rr-bar\">\n<span style=\"width:82%\"><br \/>\n<\/span>\n<\/div>\n<p><span class=\"rr-value\">1.64<\/span>\n<\/div>\n<div class=\"rr-bar-row\">\n<span><br \/>\n<span class=\"inline\" data-lang=\"en\">Vehicle<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubc14\ud0d5 \uc81c\ud615<\/span><br \/>\n<\/span><\/p>\n<div class=\"rr-bar amber\">\n<span style=\"width:4%\"><br \/>\n<\/span>\n<\/div>\n<p><span class=\"rr-value\">0.08<\/span>\n<\/div>\n<div class=\"rr-axis\">\n<span>0<\/span><br \/>\n<span>1.0<\/span><br \/>\n<span>2.0<\/span>\n<\/div>\n<p class=\"rr-caption\" data-lang=\"en\">Absolute score decrease reconstructed from the published abstract: \u22121.64 (95% CI \u22122.06 to \u22121.22) for retinol and \u22120.08 (95% CI \u22120.17 to 0.01) for vehicle, P&lt;.001. Participants had a mean age of 87 and treatment was on the arms. This is not a predicted facial result.<\/p>\n<p class=\"rr-caption\" data-lang=\"ko\">\ub17c\ubb38 \ucd08\ub85d\uc758 \uc810\uc218 \ubcc0\ud654\ub97c \uc808\ub313\uac12\uc73c\ub85c \ub2e4\uc2dc \uadf8\ub838\ub2e4. \ub808\ud2f0\ub180 \u22121.64(95% \uc2e0\ub8b0\uad6c\uac04 \u22122.06~\u22121.22), \ubc14\ud0d5 \uc81c\ud615 \u22120.08(\u22120.17~0.01), P&lt;.001\uc774\uc5c8\ub2e4. \ucc38\uc5ec\uc790\uc758 \ud3c9\uade0 \ub098\uc774\ub294 87\uc138\uc600\uace0 \ud314\uc5d0 \uc0ac\uc6a9\ud55c \uacb0\uacfc\ub2e4. \uac1c\uc778\uc758 \uc5bc\uad74 \ubcc0\ud654\ub97c \uc608\uce21\ud558\ub294 \uc790\ub8cc\uac00 \uc544\ub2c8\ub2e4.<\/p>\n<\/div>\n<div class=\"rr-chart\">\n<div class=\"rr-chart-head\">\n<div class=\"rr-chart-title\">\n<span class=\"inline\" data-lang=\"en\">Retinal 0.05% vs 0.1% after 3 months<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub808\ud2f0\ub0a0 0.05%\uc640 0.1%, 3\uac1c\uc6d4 \ud6c4<\/span>\n<\/div>\n<div class=\"rr-chart-note\">\n<span class=\"inline\" data-lang=\"en\">Published group changes \u00b7 Korean women, n=40 total<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ub17c\ubb38\uc5d0 \uc81c\uc2dc\ub41c \uc9d1\ub2e8 \ubcc0\ud654\uc728 \u00b7 \ud55c\uad6d \uc5ec\uc131 \ucd1d 40\uba85<\/span>\n<\/div>\n<\/div>\n<div class=\"rr-outcome-grid\">\n<div class=\"rr-outcome\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Texture improvement<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud53c\ubd80\uacb0 \uac1c\uc120<\/span><br \/>\n<\/strong><\/p>\n<div class=\"rr-mini-bars\">\n<div class=\"rr-mini\">\n<span>0.05%<\/span><br \/>\n<span style=\"width:92%\"><br \/>\n<\/span><br \/>\n<b>12.6%<\/b>\n<\/div>\n<div class=\"rr-mini alt\">\n<span>0.1%<\/span><br \/>\n<span style=\"width:100%\"><br \/>\n<\/span><br \/>\n<b>13.7%<\/b>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-outcome\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">TEWL reduction<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">TEWL \uac10\uc18c<\/span><br \/>\n<\/strong><\/p>\n<div class=\"rr-mini-bars\">\n<div class=\"rr-mini\">\n<span>0.05%<\/span><br \/>\n<span style=\"width:100%\"><br \/>\n<\/span><br \/>\n<b>17.9%<\/b>\n<\/div>\n<div class=\"rr-mini alt\">\n<span>0.1%<\/span><br \/>\n<span style=\"width:81%\"><br \/>\n<\/span><br \/>\n<b>14.5%<\/b>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-outcome\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Hydration increase<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc218\ubd84 \uc99d\uac00<\/span><br \/>\n<\/strong><\/p>\n<div class=\"rr-mini-bars\">\n<div class=\"rr-mini\">\n<span>0.05%<\/span><br \/>\n<span style=\"width:59%\"><br \/>\n<\/span><br \/>\n<b>6.0%<\/b>\n<\/div>\n<div class=\"rr-mini alt\">\n<span>0.1%<\/span><br \/>\n<span style=\"width:100%\"><br \/>\n<\/span><br \/>\n<b>10.2%<\/b>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"rr-outcome\">\n<strong><br \/>\n<span class=\"inline\" data-lang=\"en\">Melanin index<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uba5c\ub77c\ub2cc \uc9c0\uc218<\/span><br \/>\n<\/strong><\/p>\n<div class=\"rr-mini-bars\">\n<div class=\"rr-mini\">\n<span>0.05%<\/span><br \/>\n<span style=\"width:0\"><br \/>\n<\/span><br \/>\n<b>NS<\/b>\n<\/div>\n<div class=\"rr-mini alt\">\n<span>0.1%<\/span><br \/>\n<span style=\"width:100%\"><br \/>\n<\/span><br \/>\n<b>\u22126.5%<\/b>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"rr-caption\" data-lang=\"en\">The paper reported no significant between-group difference for the main biophysical outcomes; only the 0.1% group showed a significant melanin-index change. \u201cNS\u201d means the reported change was not statistically significant, not that the value was zero. Different outcomes use different scales, so bar lengths are normalized only within each box.<\/p>\n<p class=\"rr-caption\" data-lang=\"ko\">\uc8fc\uc694 \uc0dd\uccb4\ubb3c\ub9ac \uc9c0\ud45c\uc5d0\uc11c\ub294 \ub450 \ub18d\ub3c4 \uc0ac\uc774\uc5d0 \uc720\uc758\ud55c \ucc28\uc774\uac00 \uc5c6\uc5c8\ub2e4. \uba5c\ub77c\ub2cc \uc9c0\uc218\ub294 0.1%\uad70\uc5d0\uc11c\ub9cc \uc720\uc758\ud558\uac8c \ubcc0\ud588\ub2e4. \u2018NS\u2019\ub294 \ubcc0\ud654\ub7c9\uc774 0\uc774\ub77c\ub294 \ub73b\uc774 \uc544\ub2c8\ub77c \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ud558\uc9c0 \uc54a\uc558\ub2e4\ub294 \uc758\ubbf8\ub2e4. \uc9c0\ud45c\ub9c8\ub2e4 \ucc99\ub3c4\uac00 \ub2ec\ub77c \ub9c9\ub300 \uae38\uc774\ub294 \uac01 \uc0c1\uc790 \uc548\uc5d0\uc11c\ub9cc \ube44\uad50\ud560 \uc218 \uc788\ub2e4.<\/p>\n<\/div>\n<\/section>\n<section id=\"use\" class=\"rr-section\">\n<h2>\n<span data-lang=\"en\">How to introduce one<br \/>without overloading the routine<\/span><br \/>\n<span data-lang=\"ko\">\ub8e8\ud2f4\uc744 \ubb34\ub9ac\ud558\uac8c \ub298\ub9ac\uc9c0 \uc54a\uace0<br \/>\uc2dc\uc791\ud558\ub294 \ubc29\ubc95<\/span><br \/>\n<\/h2>\n<div class=\"rr-use-grid\">\n<div class=\"rr-use-box\">\n<h3>\n<span class=\"inline\" data-lang=\"en\">A conservative start<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ubcf4\uc218\uc801\uc73c\ub85c \uc2dc\uc791\ud558\uae30<\/span><br \/>\n<\/h3>\n<ul data-lang=\"en\">\n<li>Use one vitamin A product, not retinol and retinal together.<\/li>\n<li>Follow its label; a common clinical starting approach is alternate evenings, then adjust only if tolerated.<\/li>\n<li>Apply moisturizer as needed and use broad-spectrum sunscreen during the day.<\/li>\n<li>Do not increase concentration and frequency at the same time.<\/li>\n<\/ul>\n<ul data-lang=\"ko\">\n<li>\ub808\ud2f0\ub180\uacfc \ub808\ud2f0\ub0a0\uc744 \ub3d9\uc2dc\uc5d0 \uacb9\uccd0 \ubc14\ub974\uc9c0 \ub9d0\uace0 \ud558\ub098\ub9cc \uc120\ud0dd\ud55c\ub2e4.<\/li>\n<li>\uc81c\ud488 \ud45c\uc2dc\uc0ac\ud56d\uc744 \uc6b0\uc120 \ub530\ub978\ub2e4. \ucc98\uc74c\uc5d0\ub294 \uaca9\uc77c \uc800\ub141\ucc98\ub7fc \uac04\uaca9\uc744 \ub450\uace0, \ud53c\ubd80\uac00 \uacac\ub51c \ub54c\ub9cc \ud69f\uc218\ub97c \uc870\uc808\ud55c\ub2e4.<\/li>\n<li>\ud544\uc694\ud558\uba74 \ubcf4\uc2b5\uc81c\ub97c \ud568\uaed8 \uc4f0\uace0 \ub0ae\uc5d0\ub294 \uc790\uc678\uc120 \ucc28\ub2e8\uc81c\ub97c \ubc14\ub978\ub2e4.<\/li>\n<li>\ub18d\ub3c4\uc640 \uc0ac\uc6a9 \ud69f\uc218\ub97c \ud55c\uaebc\ubc88\uc5d0 \uc62c\ub9ac\uc9c0 \uc54a\ub294\ub2e4.<\/li>\n<\/ul>\n<\/div>\n<div class=\"rr-use-box\">\n<h3>\n<span class=\"inline\" data-lang=\"en\">What \u201c8\u201312 weeks\u201d means<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\u20188~12\uc8fc\u2019\uc758 \uc815\ud655\ud55c \uc758\ubbf8<\/span><br \/>\n<\/h3>\n<p data-lang=\"en\">It is a common assessment window in selected trials\u2014not a guaranteed onset time. Some retinol outcomes were assessed at four and eight weeks; other studies continued for 24 or 52 weeks. Retinal trials assessed outcomes at eight weeks or three months. Early irritation is not proof that the product is working.<\/p>\n<p data-lang=\"ko\">\uc77c\ubd80 \uc2dc\ud5d8\uc774 \uacb0\uacfc\ub97c \ud655\uc778\ud55c \uc2dc\uc810\uc774\uc9c0, \ub204\uad6c\uc5d0\uac8c\ub098 \uadf8\ub54c \ud6a8\uacfc\uac00 \uc2dc\uc791\ub41c\ub2e4\ub294 \ub73b\uc740 \uc544\ub2c8\ub2e4. \ub808\ud2f0\ub180 \uc5f0\uad6c\ub294 4\u00b78\uc8fc \ub610\ub294 24\u00b752\uc8fc\ub97c \uc0b4\ud3c8\uace0, \ub808\ud2f0\ub0a0 \uc5f0\uad6c\ub294 8\uc8fc\ub098 3\uac1c\uc6d4 \uc2dc\uc810\uc5d0 \ud3c9\uac00\ud588\ub2e4. \ucd08\ubc18\uc5d0 \ub530\uac11\uace0 \ubc97\uaca8\uc9c4\ub2e4\uace0 \ud574\uc11c \ud6a8\uacfc\uac00 \uc798 \ub098\ud0c0\ub098\ub294 \uac83\ub3c4 \uc544\ub2c8\ub2e4.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"safety\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Who should be cautious<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucd94\ucc9c\u00b7\uc8fc\uc758 \ub300\uc0c1<\/span>\n<\/div>\n<h2>\n<span data-lang=\"en\">Useful for some concerns,<br \/>not suitable for every moment<\/span><br \/>\n<span data-lang=\"ko\">\uace0\ubbfc\uc5d0\ub294 \ub9de\uc544\ub3c4<br \/>\uc9c0\uae08 \ub0b4 \ud53c\ubd80\uc5d0\ub294 \uc548 \ub9de\uc744 \uc218 \uc788\ub2e4<\/span><br \/>\n<\/h2>\n<div class=\"rr-people\">\n<div>\n<h3>\n<span class=\"inline\" data-lang=\"en\">Closest to studied users<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc5f0\uad6c \ub300\uc0c1\uacfc \ube44\uad50\uc801 \uac00\uae4c\uc6b4 \uc0ac\ub78c<\/span><br \/>\n<\/h3>\n<ul data-lang=\"en\">\n<li>Adults concerned about visible fine lines, rough texture or mottled pigmentation<\/li>\n<li>People who can introduce one active slowly and maintain daytime sun protection<\/li>\n<li>People choosing cosmetic appearance care\u2014not treatment of acne, eczema or pigment disease<\/li>\n<\/ul>\n<ul data-lang=\"ko\">\n<li>\ub208\uc5d0 \ubcf4\uc774\ub294 \uc794\uc8fc\ub984, \uac70\uce5c \ud53c\ubd80\uacb0, \uc5bc\ub8e9\ub35c\ub8e9\ud55c \uc0c9\uc18c \ud754\uc801\uc744 \uad00\ub9ac\ud558\ub824\ub294 \uc131\uc778<\/li>\n<li>\uae30\ub2a5\uc131 \uc81c\ud488\uc744 \ud558\ub098\uc529 \ucc9c\ucc9c\ud788 \ucd94\uac00\ud558\uace0 \ub0ae \uc790\uc678\uc120 \ucc28\ub2e8\uc744 \ubcd1\ud589\ud560 \uc0ac\ub78c<\/li>\n<li>\uc5ec\ub4dc\ub984\u00b7\uc2b5\uc9c4\u00b7\uc0c9\uc18c\uc9c8\ud658 \uce58\ub8cc\uac00 \uc544\ub2c8\ub77c \ud654\uc7a5\ud488 \ubc94\uc704\uc758 \uc678\uad00 \uad00\ub9ac\ub97c \uc6d0\ud558\ub294 \uc0ac\ub78c<\/li>\n<\/ul>\n<\/div>\n<div>\n<h3>\n<span class=\"inline\" data-lang=\"en\">Avoid or seek individual advice<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ud53c\ud558\uac70\ub098 \uc804\ubb38\uac00\uc640 \uba3c\uc800 \uc0c1\uc758\ud560 \uc0ac\ub78c<\/span><br \/>\n<\/h3>\n<ul data-lang=\"en\">\n<li>Pregnant people or those planning pregnancy: avoid retinoid products as a precaution and ask a clinician<\/li>\n<li>Active dermatitis, damaged skin barrier or recent procedures: wait and obtain professional guidance<\/li>\n<li>Persistent burning, swelling, marked redness or peeling: stop rather than \u201cpush through\u201d<\/li>\n<li>Prescription retinoid users: do not add a cosmetic retinoid without the prescriber&#8217;s advice<\/li>\n<\/ul>\n<ul data-lang=\"ko\">\n<li>\uc784\uc2e0 \uc911\uc774\uac70\ub098 \uc784\uc2e0\uc744 \uc900\ube44 \uc911\uc774\ub77c\uba74 \uc608\ubc29 \uc6d0\uce59\uc0c1 \ub808\ud2f0\ub178\uc774\ub4dc \uc81c\ud488\uc744 \ud53c\ud558\uace0 \uc758\ub8cc\uc9c4\uacfc \uc0c1\uc758\ud55c\ub2e4.<\/li>\n<li>\ud53c\ubd80\uc5fc\uc774 \uc2ec\ud558\uac70\ub098 \uc7a5\ubcbd\uc774 \uc190\uc0c1\ub410\uac70\ub098 \ucd5c\uadfc \uc2dc\uc220\uc744 \ubc1b\uc558\ub2e4\uba74 \ud68c\ubcf5 \ud6c4 \uc804\ubb38\uac00\uc758 \uc548\ub0b4\ub97c \ubc1b\ub294\ub2e4.<\/li>\n<li>\ud654\ub048\uac70\ub9bc, \ubd80\uae30, \uc2ec\ud55c \ubd89\uc5b4\uc9d0\uc774\ub098 \ubc97\uaca8\uc9d0\uc774 \uacc4\uc18d\ub418\uba74 \u2018\uc801\uc751 \uacfc\uc815\u2019\uc774\ub77c \ubc84\ud2f0\uc9c0 \ub9d0\uace0 \uc911\ub2e8\ud55c\ub2e4.<\/li>\n<li>\ucc98\ubc29 \ub808\ud2f0\ub178\uc774\ub4dc\ub97c \uc4f0\ub294 \uc911\uc774\ub77c\uba74 \ucc98\ubc29 \uc758\ub8cc\uc9c4\uacfc \uc0c1\uc758 \uc5c6\uc774 \ud654\uc7a5\ud488 \ub808\ud2f0\ub178\uc774\ub4dc\ub97c \ub354\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"rr-warning\" data-lang=\"en\">The EMA pregnancy warning directly covers medicinal topical retinoids such as tretinoin and adapalene; the AAD also advises avoiding over-the-counter retinol during pregnancy. Cosmetic retinal-specific pregnancy trials are not available to establish safety. The cautious recommendation is therefore avoidance during pregnancy or pregnancy planning, not a claim that topical cosmetic exposure has been proven to cause harm.<\/div>\n<div class=\"rr-warning\" data-lang=\"ko\">EMA\uc758 \uc784\uc2e0 \uacbd\uace0\ub294 \ud2b8\ub808\ud2f0\ub178\uc778\u00b7\uc544\ub2e4\ud314\ub80c \uac19\uc740 \uc758\uc57d\ud488 \uad6d\uc18c \ub808\ud2f0\ub178\uc774\ub4dc\ub97c \uc9c1\uc811 \ub2e4\ub8e8\uba70, \ubbf8\uad6d\ud53c\ubd80\uacfc\ud559\ud68c\ub294 \uc77c\ubc18 \ud654\uc7a5\ud488\uc758 \ub808\ud2f0\ub180\ub3c4 \uc784\uc2e0 \uc911 \ud53c\ud558\ub77c\uace0 \uc548\ub0b4\ud55c\ub2e4. \ud654\uc7a5\ud488 \ub808\ud2f0\ub0a0\ub9cc \ub530\ub85c \uc784\uc2e0\ubd80\uc5d0\uac8c \uc2dc\ud5d8\ud574 \uc548\uc804\uc131\uc744 \ud655\uc778\ud55c \uc790\ub8cc\ub294 \uc5c6\ub2e4. \ub530\ub77c\uc11c \uc784\uc2e0\u00b7\uc784\uc2e0 \uc900\ube44 \uc911 \ud53c\ud558\ub77c\ub294 \uac83\uc740 \uc608\ubc29\uc801 \uad8c\uace0\uc774\uc9c0, \ud654\uc7a5\ud488\uc758 \uad6d\uc18c \ub178\ucd9c\uc774 \uc704\ud574\ub97c \uc77c\uc73c\ud0a8\ub2e4\uace0 \uc785\uc99d\ub410\ub2e4\ub294 \uc758\ubbf8\ub294 \uc544\ub2c8\ub2e4.<\/div>\n<\/section>\n<section id=\"funding\" class=\"rr-section\">\n<h2>\n<span data-lang=\"en\">The conflict check<br \/>changes how we read certainty<\/span><br \/>\n<span data-lang=\"ko\">\ub204\uac00 \uc5f0\uad6c\ud588\ub294\uc9c0\uae4c\uc9c0 \ubd10\uc57c<br \/>\ud655\uc2e0\uc758 \uc815\ub3c4\uac00 \ubcf4\uc778\ub2e4<\/span><br \/>\n<\/h2>\n<div class=\"rr-table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\n<span class=\"inline\" data-lang=\"en\">Study<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc5f0\uad6c<\/span>\n<\/th>\n<th>\n<span class=\"inline\" data-lang=\"en\">Disclosed context<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uacf5\uac1c\ub41c \ubc30\uacbd<\/span>\n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kafi 2007<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Indexed as NIH and non-U.S. government supported; some investigators were applicants on related skin-aging treatment patents.<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">NIH \ubc0f \ubbf8\uad6d \uc678 \uc815\ubd80 \uc9c0\uc6d0 \uc5f0\uad6c\ub85c \uc0c9\uc778\ub418\uc5b4 \uc788\uc73c\uba70, \uc77c\ubd80 \uc5f0\uad6c\uc790\ub294 \uad00\ub828 \ud53c\ubd80 \ub178\ud654 \uce58\ub8cc \ud2b9\ud5c8\uc758 \ucd9c\uc6d0\uc790\uc600\ub2e4.<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>Tucker-Samaras 2009<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">The author affiliation includes Johnson &amp; Johnson Consumer Companies, so product-development involvement should be considered.<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc800\uc790 \uc18c\uc18d\uc5d0 Johnson &amp; Johnson Consumer Companies\uac00 \ud3ec\ud568\ub3fc \uc788\uc5b4 \uc81c\ud488 \uac1c\ubc1c\uc0ac\uc758 \uad00\uc5ec \uac00\ub2a5\uc131\uc744 \ud568\uaed8 \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>Kwon 2018<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">The abstract alone is insufficient to verify all funding and conflict statements.<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucd08\ub85d\ub9cc\uc73c\ub85c\ub294 \uc5f0\uad6c\ube44\uc640 \uc774\ud574\uad00\uacc4 \uacf5\uac1c \ub0b4\uc6a9\uc744 \ubaa8\ub450 \ud655\uc778\ud558\uae30 \uc5b4\ub835\ub2e4.<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>Deda 2026<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">Supported by the Medical University of Silesia and product company PH Doctor; a company employee was a co-author. The authors state that the sponsor did not influence data collection, interpretation or writing.<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc2e4\ub808\uc2dc\uc544 \uc758\uacfc\ub300\ud559\uacfc \uc81c\ud488\uc0ac PH Doctor\uc758 \uc9c0\uc6d0\uc744 \ubc1b\uc558\uace0 \uc81c\ud488\uc0ac \uc9c1\uc6d0\uc774 \uacf5\uc800\uc790\ub85c \ucc38\uc5ec\ud588\ub2e4. \uc800\uc790\ub4e4\uc740 \ud6c4\uc6d0\uc0ac\uac00 \uc790\ub8cc \uc218\uc9d1\u00b7\ud574\uc11d\u00b7\uc6d0\uace0 \uc791\uc131\uc5d0 \uad00\uc5ec\ud558\uc9c0 \uc54a\uc558\ub2e4\uace0 \ubc1d\ud614\ub2e4.<\/span>\n<\/td>\n<\/tr>\n<tr>\n<td>Kim 2021<\/td>\n<td>\n<span class=\"inline\" data-lang=\"en\">The authors reported no conflict of interest. Funding was not verifiable from the public abstract; this remains a formula-level comparison, not a molecule-only test.<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\uc800\uc790\ub4e4\uc740 \uc774\ud574\uad00\uacc4\uac00 \uc5c6\ub2e4\uace0 \ubcf4\uace0\ud588\ub2e4. \uacf5\uac1c \ucd08\ub85d\ub9cc\uc73c\ub85c \uc5f0\uad6c\ube44\ub294 \ud655\uc778\ub418\uc9c0 \uc54a\uc558\uc73c\uba70, \uc131\ubd84 \ub2e8\ub3c5\uc774 \uc544\ub2c8\ub77c \uc644\uc81c\ud488 \uc81c\ud615\ub07c\ub9ac\uc758 \ube44\uad50\ub77c\ub294 \ud55c\uacc4\uac00 \ub0a8\ub294\ub2e4.<\/span>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"rr-caption\" data-lang=\"en\">Industry involvement does not make a result false. It does lower confidence when methods, complete numerical results or independent replications are limited.<\/p>\n<p class=\"rr-caption\" data-lang=\"ko\">\uae30\uc5c5\uc774 \uad00\uc5ec\ud588\ub2e4\uace0 \uacb0\uacfc\uac00 \uace7\ubc14\ub85c \ud2c0\ub9b0 \uac83\uc740 \uc544\ub2c8\ub2e4. \ub2e4\ub9cc \ubc29\ubc95\uacfc \uc804\uccb4 \uc218\uce58\uac00 \ucda9\ubd84\ud788 \uacf5\uac1c\ub418\uc9c0 \uc54a\uc558\uac70\ub098 \ub3c5\ub9bd \uc5f0\uad6c\uc9c4\uc758 \ubc18\ubcf5 \uac80\uc99d\uc774 \ubd80\uc871\ud558\uba74 \ud655\uc2e0\uc758 \uc218\uc900\uc744 \ub0ae\ucdb0 \uc77d\uc5b4\uc57c \ud55c\ub2e4.<\/p>\n<\/section>\n<section id=\"refs\" class=\"rr-section\">\n<div class=\"rr-kicker\">\n<span class=\"inline\" data-lang=\"en\">Traceable sources<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucd94\uc801 \uac00\ub2a5\ud55c \ucd9c\ucc98<\/span>\n<\/div>\n<h2>\n<span class=\"inline\" data-lang=\"en\">References<\/span><br \/>\n<span class=\"inline\" data-lang=\"ko\">\ucc38\uace0\ubb38\ud5cc<\/span><br \/>\n<\/h2>\n<ol class=\"rr-refs\">\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/17515510\/\" target=\"_blank\" rel=\"noopener\">Kafi R, et al.<\/a> Improvement of naturally aged skin with vitamin A (retinol). Arch Dermatol. 2007;143(5):606-612. doi:10.1001\/archderm.143.5.606.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/19852122\/\" target=\"_blank\" rel=\"noopener\">Tucker-Samaras S, et al.<\/a> A stabilized 0.1% retinol facial moisturizer improves the appearance of photodamaged skin. J Drugs Dermatol. 2009;8(10):932-936.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25738849\/\" target=\"_blank\" rel=\"noopener\">Randhawa M, et al.<\/a> One-year topical stabilized retinol treatment improves photodamaged skin. J Drugs Dermatol. 2015;14(3):271-280.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/7798613\/\" target=\"_blank\" rel=\"noopener\">Saurat JH, et al.<\/a> Topical retinaldehyde on human skin: biologic effects and tolerance. J Invest Dermatol. 1994;103(6):770-774. doi:10.1111\/1523-1747.ep12412861.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10473961\/\" target=\"_blank\" rel=\"noopener\">Creidi P, Humbert P.<\/a> Clinical use of topical retinaldehyde on photoaged skin. Dermatology. 1999;199 Suppl 1:49-52. doi:10.1159\/000051379.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10473963\/\" target=\"_blank\" rel=\"noopener\">Fluhr JW, et al.<\/a> Tolerance profile of retinol, retinaldehyde and retinoic acid. Dermatology. 1999;199 Suppl 1:57-60. doi:10.1159\/000051381.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/29663701\/\" target=\"_blank\" rel=\"noopener\">Kwon HS, et al.<\/a> Efficacy and safety of retinaldehyde 0.1% and 0.05% creams used to treat photoaged skin. J Cosmet Dermatol. 2018;17(3):471-476. doi:10.1111\/jocd.12551.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41729119\/\" target=\"_blank\" rel=\"noopener\">Deda A, et al.<\/a> Comparative evaluation of topical stabilized retinaldehyde 0.1% vs. 0.05% on skin biophysical and biomechanical parameters. Skin Res Technol. 2026;32(2):e70326. doi:10.1111\/srt.70326.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/33569865\/\" target=\"_blank\" rel=\"noopener\">Kim J, et al.<\/a> Efficacy and safety of multilamellar vesicle containing retinaldehyde. J Cosmet Dermatol. 2021;20(9):2874-2879. doi:10.1111\/jocd.13993.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/health.ec.europa.eu\/publications\/vitamin-retinol-retinyl-acetate-retinyl-palmitate_en\" target=\"_blank\" rel=\"noopener\">Scientific Committee on Consumer Safety.<\/a> Opinion on Vitamin A. SCCS\/1576\/16.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/eur-lex.europa.eu\/eli\/reg\/2024\/996\/oj\/eng\" target=\"_blank\" rel=\"noopener\">European Commission.<\/a> Commission Regulation (EU) 2024\/996.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/www.ema.europa.eu\/en\/medicines\/human\/referrals\/retinoid-containing-medicinal-products\" target=\"_blank\" rel=\"noopener\">European Medicines Agency.<\/a> Retinoid-containing medicinal products: pregnancy-prevention measures.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/www.aad.org\/public\/everyday-care\/skin-care-secrets\/routine\/pregnancy-skin-care\" target=\"_blank\" rel=\"noopener\">American Academy of Dermatology.<\/a> Dermatologist-approved pregnancy skin care.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/www.law.go.kr\/LSW\/flDownload.do?bylClsCd=200201&amp;flNm=%5B%EB%B3%84%ED%91%9C+3%5D+%ED%94%BC%EB%B6%80%EC%9D%98+%EC%A3%BC%EB%A6%84%EA%B0%9C%EC%84%A0%EC%97%90+%EB%8F%84%EC%9B%80%EC%9D%84+%EC%A3%BC%EB%8A%94+%EA%B8%B0%EB%8A%A5%EC%84%B1%ED%99%94%EC%9E%A5%ED%92%88+%EA%B0%81%EC%A1%B0+%28%EC%A0%9C2%EC%A1%B0%EC%A0%9C3%ED%98%B8+%EA%B4%80%EB%A0%A8%29&amp;flSeq=160449851\" target=\"_blank\" rel=\"noopener\">\uc2dd\ud488\uc758\uc57d\ud488\uc548\uc804\ucc98.<\/a> \uae30\ub2a5\uc131\ud654\uc7a5\ud488 \uae30\uc900 \ubc0f \uc2dc\ud5d8\ubc29\ubc95 \ubcc4\ud45c 3.<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/www.law.go.kr\/LSW\/lsInfoP.do?lsiSeq=269987\" target=\"_blank\" rel=\"noopener\">\uc2dd\ud488\uc758\uc57d\ud488\uc548\uc804\ucc98.<\/a> \uae30\ub2a5\uc131\ud654\uc7a5\ud488 \uc2ec\uc0ac \uaddc\uc815: \uc790\ub8cc \uc81c\ucd9c\uc774 \uc0dd\ub7b5\ub418\ub294 \uae30\ub2a5\uc131\ud654\uc7a5\ud488\uc758 \uc885\ub958(\ubcc4\ud45c 4).<\/li>\n<li>\n<a class=\"rr-source\" href=\"https:\/\/ods.od.nih.gov\/factsheets\/VitaminA-HealthProfessional\/\" target=\"_blank\" rel=\"noopener\">NIH Office of Dietary Supplements.<\/a> Vitamin A and Carotenoids: Health Professional Fact Sheet.<\/li>\n<\/ol>\n<\/section>\n<\/article><\/div>\n<\/p><\/div>\n<p><script>(()=>{const path=document.querySelector(\".rr-pathway\"),toggle=document.querySelector(\".rr-motion-toggle\"),hero=document.querySelector(\".rr-hero-visual img\"),ko=document.body.classList.contains(\"kbl-ko\");const chart=document.querySelector(\".rr-chart[role=img]\");if(chart)chart.setAttribute(\"aria-label\",ko?\"Kafi 2007 \ub808\ud2f0\ub180 \uc5f0\uad6c\uc5d0\uc11c 24\uc8fc \ud6c4 \uad00\ucc30\ub41c \uc794\uc8fc\ub984 \uc810\uc218 \uac10\uc18c\ud3ed\":\"Absolute reduction in fine-wrinkle score after 24 weeks in the Kafi 2007 retinol study\");if(hero)hero.alt=ko?\"\ub808\ud2f0\ub180\uacfc \ub808\ud2f0\ub0a0\uc758 \uc804\ud658 \uacbd\ub85c\ub97c \ud53c\ubd80 \ub2e8\uba74\uacfc \ud568\uaed8 \uade0\ud615 \uc788\uac8c \ud45c\ud604\ud55c \uacfc\ud559 \ud3b8\uc9d1 \uc774\ubbf8\uc9c0\":\"Balanced scientific editorial illustration comparing retinol and retinal pathways above a skin cross-section\";if(path)path.setAttribute(\"aria-label\",ko?\"\ub808\ud2f0\ub180\uacfc \ub808\ud2f0\ub0a0\uc758 \uc804\ud658 \uacfc\uc815\uc744 \ub2e8\uc21c\ud654\ud55c \uadf8\ub9bc\":\"Simplified retinol and retinal conversion pathways\");if(toggle&&path)toggle.addEventListener(\"click\",()=>{const paused=path.classList.toggle(\"paused\");toggle.setAttribute(\"aria-pressed\",String(paused));toggle.querySelector(\"[data-lang=en]\").textContent=paused?\"Play motion\":\"Pause motion\";toggle.querySelector(\"[data-lang=ko]\").textContent=paused?\"\ubaa8\uc158 \uc7ac\uc0dd\":\"\ubaa8\uc158 \uba48\ucda4\"})})()<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ub808\ud2f0\ub180\uacfc \ub808\ud2f0\ub0a0 \uc911 \ubb34\uc5c7\uc744 \uace0\ub97c\uae4c\uc694? 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