Ingredient evidence report
์„ฑ๋ถ„ ๊ทผ๊ฑฐ ๋ฆฌํฌํŠธ

Retinol vs retinal:
differences & how to choose
๋ ˆํ‹ฐ๋†€ vs ๋ ˆํ‹ฐ๋‚ ,
์ฐจ์ด์™€ ์„ ํƒ ๊ธฐ์ค€

Retinol has the broader human evidence base; retinal is not automatically stronger or gentler. Compare tested concentrations, irritation and the finished formula before choosing.

๋ ˆํ‹ฐ๋†€์€ ๋” ํญ๋„“์€ ์ธ์ฒด์‹œํ—˜ ๊ทผ๊ฑฐ๊ฐ€ ์žˆ๊ณ , ๋ ˆํ‹ฐ๋‚ ์ด ์–ธ์ œ๋‚˜ ๋” ๊ฐ•ํ•˜๊ฑฐ๋‚˜ ์ˆœํ•œ ๊ฒƒ์€ ์•„๋‹™๋‹ˆ๋‹ค. ์—ฐ๊ตฌ ๋†๋„, ์ž๊ทน ๊ฐ€๋Šฅ์„ฑ๊ณผ ์™„์ œํ’ˆ์˜ ์ œํ˜•์„ ๋น„๊ตํ•ด ์„ ํƒํ•˜์„ธ์š”.

Put the comparison into practice: Dr. Different Retinal 1000 formula report ยท Retinol and moisturizer order.

์ œํ’ˆ๊ณผ ์‚ฌ์šฉ ์ˆœ์„œ๊นŒ์ง€ ํ™•์ธํ•˜๋ ค๋ฉด: ๋‹ฅํ„ฐ๋””ํผ๋ŸฐํŠธ ๋ ˆํ‹ฐ๋‚  1000 ์ฒ˜๋ฐฉ ๋ฆฌํฌํŠธ ยท ๋ ˆํ‹ฐ๋†€ยท๋ณด์Šต์ œ ์‚ฌ์šฉ ์ˆœ์„œ.


Fine lines
์ž”์ฃผ๋ฆ„


Texture
ํ”ผ๋ถ€๊ฒฐ


Pigment marks
์ƒ‰์†Œ ํ”์ 


Tolerance
์ž๊ทนยท์ ์‘


Night routine
์ €๋… ๋ฃจํ‹ด
Balanced scientific editorial illustration comparing retinol and retinal pathways above a skin cross-section

Evidence scope
๊ฒ€ํ†  ๋ฒ”์œ„


Human trials + official regulation
์ธ์ฒด์‹œํ—˜๊ณผ ๊ณต์‹ ๊ทœ์ •

Direct comparison
์ง์ ‘ ๋น„๊ต


One small 8-week split-face study
์†Œ๊ทœ๋ชจ 8์ฃผ ๋ถ„ํ•  ์•ˆ๋ฉด ์—ฐ๊ตฌ 1๊ฑด

Important
์ฃผ์˜


Cosmetic informationโ€”not medical advice
ํ™”์žฅํ’ˆ ์ •๋ณด์ด๋ฉฐ ์˜ํ•™์  ์กฐ์–ธ์ด ์•„๋‹˜
30-second answer
30์ดˆ ํ•ต์‹ฌ ์š”์•ฝ

The honest answer:
there is no universal winner

๊ฒฐ๋ก ๋ถ€ํ„ฐ ๋งํ•˜๋ฉด,
๋ฌด์กฐ๊ฑด ๋” ์ข‹์€ ์ชฝ์€ ์—†๋‹ค

Retinol has the broader and longer human evidence base. Retinal has promising trialsโ€”including one direct comparisonโ€”but the evidence is smaller and formulation-dependent.
๋ ˆํ‹ฐ๋†€์€ ๋” ์˜ค๋ž˜, ๋” ๋‹ค์–‘ํ•œ ์ธ์ฒด์‹œํ—˜์œผ๋กœ ์—ฐ๊ตฌ๋๋‹ค. ๋ ˆํ‹ฐ๋‚ ๋„ ๊ฐ€๋Šฅ์„ฑ์„ ๋ณด์—ฌ์ค€ ์‹œํ—˜์ด ์žˆ์ง€๋งŒ ์ž๋ฃŒ ์ˆ˜๊ฐ€ ์ ๊ณ  ์ œํ˜•์˜ ์˜ํ–ฅ์„ ๋งŽ์ด ๋ฐ›๋Š”๋‹ค.

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 consistentlyโ€”not the one with the louder potency claim.

์ž”์ฃผ๋ฆ„๊ณผ ํ”ผ๋ถ€๊ฒฐ, ๊ณ ๋ฅด์ง€ ๋ชปํ•œ ์ƒ‰์†Œ ํ”์ ์„ ๊ด€๋ฆฌํ•˜๋ ค๋ฉด ๋‘˜ ๋‹ค ์„ ํƒ์ง€๊ฐ€ ๋  ์ˆ˜ ์žˆ๋‹ค. ๋‹ค๋งŒ โ€˜๋” ๊ฐ•ํ•˜๋‹คโ€™๋Š” ๊ด‘๊ณ ๋ณด๋‹ค ๋†๋„๋ฅผ ๊ณต๊ฐœํ–ˆ๋Š”์ง€, ๋น›๊ณผ ๊ณต๊ธฐ๋ฅผ ๋ง‰๋Š” ์šฉ๊ธฐ์ธ์ง€, ์‚ฌ์šฉ๋ฒ•์ด ๊ตฌ์ฒด์ ์ธ์ง€, ๋‚ด ํ”ผ๋ถ€๊ฐ€ ๊พธ์ค€ํžˆ ์“ธ ์ˆ˜ ์žˆ๋Š”์ง€๋ฅผ ๋จผ์ € ๋ณด์ž.


Retinol studied
๋ ˆํ‹ฐ๋†€ ์—ฐ๊ตฌ ๋†๋„


0.1%โ€“0.4% in selected human trials
์ผ๋ถ€ ์ธ์ฒด์‹œํ—˜์—์„œ 0.1~0.4%

Retinal studied
๋ ˆํ‹ฐ๋‚  ์—ฐ๊ตฌ ๋†๋„


0.05%โ€“0.1% in the most useful facial trials
์ฃผ์š” ์–ผ๊ตด ์‹œํ—˜์—์„œ 0.05~0.1%

When assessed
๋ณ€ํ™”๋ฅผ ์‚ดํ•€ ์‹œ์ 


Mostly 8โ€“24 weeks; one retinol study continued 52 weeks
์ฃผ๋กœ 8~24์ฃผ, ๋ ˆํ‹ฐ๋†€ ์—ฐ๊ตฌ 1๊ฑด์€ 52์ฃผ

Not established
ํ™•์ธ๋˜์ง€ ์•Š์€ ์ฃผ์žฅ


No universal potency ratio or equivalent-dose table
๋ณดํŽธ์ ์ธ โ€˜๋ช‡ ๋ฐฐ ๊ฐ•ํ•จโ€™ ๋˜๋Š” ๋™๋“ฑ ๋†๋„ํ‘œ
Plain-language rule: 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 formulasโ€”not a personal dose or a promised deadline.
์‰ฝ๊ฒŒ ๊ธฐ์–ตํ•˜๋ฉด: ๋น„ํƒ€๋ฏผ A ํ™”์žฅํ’ˆ์ด ์ฒ˜์Œ์ด๋ผ๋ฉด ์ˆซ์ž๊ฐ€ ํฐ ์ œํ’ˆ๋ถ€ํ„ฐ ๊ณ ๋ฅด์ง€ ์•Š๋Š”๋‹ค. ์ œํ’ˆ ํ•˜๋‚˜๋งŒ ์„ ํƒํ•ด ํ‘œ์‹œ๋œ ์‚ฌ์šฉ๋ฒ•์„ ๋”ฐ๋ฅด๊ณ , ์‚ฌ์šฉ ํšŸ์ˆ˜๋ฅผ ๋Š˜๋ฆฌ๊ธฐ ์ „์— ํ”ผ๋ถ€๊ฐ€ ๊ฒฌ๋””๋Š”์ง€ ๋จผ์ € ๋ณธ๋‹ค. ๋…ผ๋ฌธ ์† ๋†๋„์™€ ๊ธฐ๊ฐ„์€ ๊ทธ ์ œํ˜•์˜ ์‹œํ—˜ ์กฐ๊ฑด์ผ ๋ฟ, ๊ฐœ์ธ์—๊ฒŒ ๊ถŒํ•˜๋Š” ์šฉ๋Ÿ‰์ด๋‚˜ ํšจ๊ณผ ๋ณด์žฅ ์‹œ์ ์ด ์•„๋‹ˆ๋‹ค.

Choose by evidence,
formula and tolerance

์„ฑ๋ถ„ ์ด๋ฆ„๋ณด๋‹ค
๊ทผ๊ฑฐยท์ œํ˜•ยท์ ์‘๋„๋ฅผ ๋ณด์ž

Retinol

A sensible first choice when you want the better-established cosmetic evidence base and a product that clearly states its strength and stability strategy.

์ธ์ฒด์‹œํ—˜์ด ๋น„๊ต์  ๋งŽ์ด ์ถ•์ ๋œ ์„ฑ๋ถ„์„ ์›ํ•˜๊ณ , ๋†๋„์™€ ์•ˆ์ •ํ™” ๋ฐฉ์‹์ด ๋ช…ํ™•ํ•œ ์ œํ’ˆ์„ ์ฐพ์•˜๋‹ค๋ฉด ์šฐ์„  ๊ณ ๋ คํ•  ์ˆ˜ ์žˆ๋‹ค.

Evidence advantage
๊ทผ๊ฑฐ์ƒ์˜ ์žฅ์ 
Vehicle-controlled trials from 8 to 52 weeks
8~52์ฃผ ๋Œ€์กฐ์‹œํ—˜ ์ž๋ฃŒ๊ฐ€ ์žˆ์Œ
Practical weakness
์‹ค์‚ฌ์šฉ ์•ฝ์ 
Unstable unless protected in the final formula
์™„์ œํ’ˆ์—์„œ ์•ˆ์ •ํ™”ํ•˜์ง€ ์•Š์œผ๋ฉด ํ’ˆ์งˆ ์œ ์ง€๊ฐ€ ์–ด๋ ค์›€
Retinal

A reasonable option when a well-described, protected formula is available and you accept that the human evidence baseโ€”and independent replicationโ€”is smaller.

๋†๋„์™€ ์ „๋‹ฌ ๊ธฐ์ˆ ์ด ๊ตฌ์ฒด์ ์œผ๋กœ ๊ณต๊ฐœ๋œ ์ œํ’ˆ์„ ์ฐพ์•˜๊ณ , ๋ ˆํ‹ฐ๋†€๋ณด๋‹ค ๋…๋ฆฝ์ ์ธ ๋ฐ˜๋ณต ์—ฐ๊ตฌ๊ฐ€ ์ ๋‹ค๋Š” ํ•œ๊ณ„๋ฅผ ์ดํ•ดํ•œ๋‹ค๋ฉด ์„ ํƒํ•  ์ˆ˜ ์žˆ๋‹ค.

Evidence advantage
๊ทผ๊ฑฐ์ƒ์˜ ์žฅ์ 
0.05% and 0.1% facial trials; one small direct study
0.05ยท0.1% ์–ผ๊ตด ์‹œํ—˜๊ณผ ์†Œ๊ทœ๋ชจ ์ง์ ‘ ๋น„๊ต 1๊ฑด
Evidence weakness
๊ทผ๊ฑฐ์ƒ์˜ ์•ฝ์ 
Fewer trials; delivery systems confound comparison
์—ฐ๊ตฌ ์ˆ˜๊ฐ€ ์ ๊ณ  ์ „๋‹ฌ ์ œํ˜•์˜ ์˜ํ–ฅ์„ ๋ถ„๋ฆฌํ•˜๊ธฐ ์–ด๋ ค์›€
If one option repeatedly causes burning, persistent redness or peeling, theoretical potency does not make it the better option for you.
ํ™”๋ˆ๊ฑฐ๋ฆผ์ด๋‚˜ ๋ถ‰์–ด์ง, ๊ฐ์งˆ์ด ๊ณ„์†๋œ๋‹ค๋ฉด ์ด๋ก ์ƒ ๊ฐ•ํ•œ ์„ฑ๋ถ„์ด๋ผ๋„ ๋‚˜์—๊ฒŒ ๋” ์ข‹์€ ์„ ํƒ์€ ์•„๋‹ˆ๋‹ค.
Market and regulation
์‹œ์žฅ๊ณผ ๊ทœ์ •

Why brands choose
one name over the other

๋ธŒ๋žœ๋“œ๋Š” ์™œ
๋‘˜ ์ค‘ ํ•˜๋‚˜๋ฅผ ํƒํ• ๊นŒ?

Common product-development logic
์ œํ’ˆ์„ ์„ค๊ณ„ํ•  ๋•Œ์˜ ํ˜„์‹ค์ ์ธ ์ด์œ 

  1. Retinol: recognizable to consumers, backed by more human trials, and compatible with familiar strength laddersโ€”but it requires stabilization.
  2. Retinal: supports a โ€œone conversion stepโ€ story and low-number positioning, but the formula and delivery system are part of the evidenceโ€”not a footnote.
  3. Both: benefit from light- and air-protective packaging. A percentage alone cannot reveal how much active remains through shelf life.
  1. ๋ ˆํ‹ฐ๋†€: ์†Œ๋น„์ž ์ธ์ง€๋„๊ฐ€ ๋†’๊ณ  ์ธ์ฒด์‹œํ—˜์ด ๋” ๋งŽ์•„ ๋‹จ๊ณ„๋ณ„ ๋†๋„ ์ œํ’ˆ์„ ๊ตฌ์„ฑํ•˜๊ธฐ ์‰ฝ๋‹ค. ๋Œ€์‹  ์•ˆ์ •ํ™”๊ฐ€ ํ•ต์‹ฌ ๊ณผ์ œ๋‹ค.
  2. ๋ ˆํ‹ฐ๋‚ : โ€˜ํ™œ์„ฑํ˜•๊นŒ์ง€ ํ•œ ๋‹จ๊ณ„โ€™๋ผ๋Š” ์„ค๋ช…๊ณผ ๋‚ฎ์€ ์ˆซ์ž์˜ ๋†๋„๋ฅผ ๋‚ด์„ธ์šฐ๊ธฐ ์ข‹๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์ „๋‹ฌ ๊ธฐ์ˆ ์ด ์‹œํ—˜ ๊ฒฐ๊ณผ์— ์˜ํ–ฅ์„ ์ฃผ๋ฏ€๋กœ ์„ฑ๋ถ„ ์ด๋ฆ„๋งŒ ๋–ผ์–ด ๋น„๊ตํ•˜๋ฉด ์•ˆ ๋œ๋‹ค.
  3. ๊ณตํ†ต: ๋น›๊ณผ ๊ณต๊ธฐ๋ฅผ ๋ง‰๋Š” ์šฉ๊ธฐ๊ฐ€ ์ค‘์š”ํ•˜๋‹ค. ํ‘œ์‹œ ๋†๋„๋งŒ์œผ๋กœ ์œ ํ†ต๊ธฐํ•œ ๋™์•ˆ ์‹ค์ œ ํ™œ์„ฑ ์„ฑ๋ถ„์ด ์–ผ๋งˆ๋‚˜ ๋‚จ๋Š”์ง€๋Š” ์•Œ ์ˆ˜ ์—†๋‹ค.

South Korea
ํ•œ๊ตญ

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’s claim route cannot be inferred from retinol’s entry.
ํ˜„ํ–‰ ๊ธฐ๋Šฅ์„ฑํ™”์žฅํ’ˆ ๊ธฐ์ค€์—๋Š” ๋ ˆํ‹ฐ๋†€ ์›๋ฃŒ์™€ ์™„์ œํ’ˆ ๊ฐ์กฐ๊ฐ€ ์žˆ๋‹ค. ๋ ˆํ‹ฐ๋†€์€ 2,500 IU/g์ด ์ฃผ๋ฆ„๊ฐœ์„  ๊ณ ์‹œ ํ•จ๋Ÿ‰์œผ๋กœ ์“ฐ์ธ๋‹ค. ๋ ˆํ‹ฐ๋‚ ์€ ๊ฐ™์€ ๋ชฉ๋ก์— ๋ช…์‹œ๋ผ ์žˆ์ง€ ์•Š์œผ๋ฏ€๋กœ, ๋ ˆํ‹ฐ๋†€์˜ ๋ณด๊ณ  ๊ฒฝ๋กœ๋ฅผ ๋ ˆํ‹ฐ๋‚  ์ œํ’ˆ์— ๊ทธ๋Œ€๋กœ ์ ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค๊ณ  ๋‹จ์ •ํ•˜๋ฉด ์•ˆ ๋œ๋‹ค.

European Union
์œ ๋Ÿฝ์—ฐํ•ฉ

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.
EU ๊ทœ์ • 2024/996์€ ๋ ˆํ‹ฐ๋†€๊ณผ ์ผ๋ถ€ ๋ ˆํ‹ฐ๋‹ ์—์Šคํ„ฐ๋ฅผ ๋Œ€๋ถ€๋ถ„์˜ ๋ฐ”๋ฅด๋Š”ยท์”ป์–ด๋‚ด๋Š” ์ œํ’ˆ์—์„œ ๋ ˆํ‹ฐ๋†€ ํ™˜์‚ฐ 0.3%, ๋ฐ”๋””๋กœ์…˜์—์„œ 0.05%๋กœ ์ œํ•œํ•˜๋ฉฐ ๊ฒฝ๊ณผ๊ธฐ๊ฐ„์„ ๋‘๊ณ  ์ ์šฉํ•œ๋‹ค. ๋ ˆํ‹ฐ๋‚ ์€ ์‹ ์ฒญ์ž๊ฐ€ ๋ณ„๋„ ์ž๋ฃŒ๋ฅผ ์ œ์ถœํ•˜์ง€ ์•Š์•„ SCCS ๋น„ํƒ€๋ฏผ A ํ‰๊ฐ€ ๋Œ€์ƒ์— ํฌํ•จ๋˜์ง€ ์•Š์•˜๋‹ค.
Do not compare labels mechanically: using the NIH conversion of 1 IU retinol = 0.3 ฮผg 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.
๋ผ๋ฒจ ์ˆซ์ž๋ฅผ ๊ธฐ๊ณ„์ ์œผ๋กœ ๋น„๊ตํ•˜๋ฉด ์•ˆ ๋œ๋‹ค: ๋ฏธ๊ตญ ๊ตญ๋ฆฝ๋ณด๊ฑด์› ํ™˜์‚ฐ์‹์ธ ๋ ˆํ‹ฐ๋†€ 1 IU = 0.3 ฮผg RAE๋ฅผ ์ ์šฉํ•˜๋ฉด 2,500 IU/g์€ ๊ณ„์‚ฐ์ƒ ๋ ˆํ‹ฐ๋†€ 0.075%์— ํ•ด๋‹นํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์ด ๊ณ„์‚ฐ๋งŒ์œผ๋กœ ๊ตญ๋‚ด ๊ธฐ๋Šฅ์„ฑ ๋ณด๊ณ  ๊ธฐ์ค€๊ณผ ํ•ด์™ธ ํผ์„ผํŠธ ํ‘œ๊ธฐ, ํก์ˆ˜์œจ, ์‹ค์ œ ํšจ๋Šฅ์ด ์„œ๋กœ ๊ฐ™๋‹ค๊ณ  ๋ณผ ์ˆ˜๋Š” ์—†๋‹ค.
Mechanism without the hype
๊ณผ์žฅ ์—†์ด ๋ณด๋Š” ์ž‘๋™ ๊ฒฝ๋กœ

One fewer conversion step
is not a potency equation

์ „ํ™˜ ๋‹จ๊ณ„๊ฐ€ ํ•˜๋‚˜ ์ ๋‹ค๊ณ 
ํšจ๋Šฅ ๋ฐฐ์ˆ˜๊ฐ€ ์ •ํ•ด์ง€์ง„ ์•Š๋Š”๋‹ค


Simplified cutaneous conversion
ํ”ผ๋ถ€ ๋‚ด ์ „ํ™˜ ๊ณผ์ •์„ ๋‹จ์ˆœํ™”ํ•œ ๊ทธ๋ฆผ

Starting form์‹œ์ž‘ ์„ฑ๋ถ„Retinol

Intermediate์ค‘๊ฐ„ ๋‹จ๊ณ„Retinaldehyde

Receptor-active form์ˆ˜์šฉ์ฒด ํ™œ์„ฑํ˜•Retinoic acid
Starting form์‹œ์ž‘ ์„ฑ๋ถ„Retinaldehyde

Receptor-active form์ˆ˜์šฉ์ฒด ํ™œ์„ฑํ˜•Retinoic acid

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 โ€œretinal is 10ร— or 11ร— strongerโ€ without a validated clinical dose-equivalence study.

์ด ๊ทธ๋ฆผ์€ ์ƒํ™”ํ•™์  ๊ฒฝ๋กœ์ด์ง€ ์†๋„๊ณ„๊ฐ€ ์•„๋‹ˆ๋‹ค. ์‹ค์ œ ์ „ํ™˜์€ ํšจ์†Œ, ๋†๋„, ๋ฐ”ํƒ• ์ œํ˜•, ์•ˆ์ •์„ฑ, ์ „๋‹ฌ ๋ฐฉ์‹, ํ”ผ๋ถ€ ์ƒํƒœ์˜ ์˜ํ–ฅ์„ ๋ฐ›๋Š”๋‹ค. ์ž„์ƒ์ ์œผ๋กœ ๋™๋“ฑํ•œ ๋†๋„๋ฅผ ์ง์ ‘ ๊ฒ€์ฆํ•˜์ง€ ์•Š์€ ์ฑ„ โ€˜๋ ˆํ‹ฐ๋‚ ์ด 10๋ฐฐ ๋˜๋Š” 11๋ฐฐ ๊ฐ•ํ•˜๋‹คโ€™๊ณ  ๊ฒฐ๋ก  ๋‚ด๋ฆด ๊ทผ๊ฑฐ๋Š” ๋˜์ง€ ์•Š๋Š”๋‹ค.

Human studies first
์ธ์ฒด์‹œํ—˜๋ถ€ํ„ฐ ํ™•์ธ

What was actually
tested on people

์‚ฌ๋žŒ ํ”ผ๋ถ€์—์„œ๋Š”
๋ฌด์—‡์„ ์‹œํ—˜ํ–ˆ์„๊นŒ?

Study
์—ฐ๊ตฌ
Design
์„ค๊ณ„
Observed result
๊ด€์ฐฐ๋œ ๊ฒฐ๊ณผ
Main limit
์ฃผ์š” ํ•œ๊ณ„
Retinol

Kafi 2007
0.4%, up to 3ร— weekly, 24 weeks; randomized arm comparison; 36 very old adults
0.4%, ์ฃผ 3ํšŒ ์ดํ•˜, 24์ฃผ; ๋ฌด์ž‘์œ„ ํŒ” ๋น„๊ต; ๊ณ ๋ น์ž 36๋ช…
Fine-wrinkle score changed โˆ’1.64 vs โˆ’0.08 with vehicle
์ž”์ฃผ๋ฆ„ ์ ์ˆ˜ ๋ณ€ํ™” โˆ’1.64, ๋ฐ”ํƒ• ์ œํ˜• โˆ’0.08
Mean age 87; forearm, not face
ํ‰๊ท  87์„ธ, ์–ผ๊ตด์ด ์•„๋‹Œ ํŒ” ํ”ผ๋ถ€
Retinol

Tucker-Samaras 2009
Stabilized 0.1%, daily, 8 weeks; double-blind split-face vehicle control
์•ˆ์ •ํ™” 0.1%, ๋งค์ผ, 8์ฃผ; ์ด์ค‘๋ˆˆ๊ฐ€๋ฆผ ๋ถ„ํ•  ์•ˆ๋ฉด ๋Œ€์กฐ
Greater improvement than vehicle across assessed photoaging parameters at week 8
8์ฃผ์— ์—ฌ๋Ÿฌ ๊ด‘๋…ธํ™” ํ‰๊ฐ€ ํ•ญ๋ชฉ์—์„œ ๋ฐ”ํƒ• ์ œํ˜•๋ณด๋‹ค ํฐ ๋ณ€ํ™”
Author affiliation includes J&J Consumer Companies
์ €์ž ์†Œ์†์— J&J Consumer Companies ํฌํ•จ
Retinal

Kwon 2018
0.05% or 0.1%, twice daily, 3 months; randomized double-blind; 40 Korean women
0.05% ๋˜๋Š” 0.1%, ํ•˜๋ฃจ 2ํšŒ, 3๊ฐœ์›”; ๋ฌด์ž‘์œ„ ์ด์ค‘๋ˆˆ๊ฐ€๋ฆผ; ํ•œ๊ตญ ์—ฌ์„ฑ 40๋ช…
Texture, TEWL and hydration improved in both groups; no significant between-dose difference
๋‘ ๊ตฐ ๋ชจ๋‘ ํ”ผ๋ถ€๊ฒฐยทTEWLยท์ˆ˜๋ถ„ ์ง€ํ‘œ๊ฐ€ ๊ฐœ์„ ๋์ง€๋งŒ ๋†๋„ ๊ฐ„ ์œ ์˜ํ•œ ์ฐจ์ด๋Š” ์—†์Œ
No vehicle-only group in the abstract; small study
์ดˆ๋ก์ƒ ๋ฐ”ํƒ• ์ œํ˜• ๋‹จ๋…๊ตฐ์ด ์—†๊ณ  ํ‘œ๋ณธ์ด ์ž‘์Œ
Retinal

Deda 2026
Stabilized 0.1% vs 0.05%, split face, 24 weeks; 56 women aged 30โ€“58
์•ˆ์ •ํ™” ๋ ˆํ‹ฐ๋‚  0.1%์™€ 0.05%, ๋ถ„ํ•  ์•ˆ๋ฉด, 24์ฃผ; 30~58์„ธ ์—ฌ์„ฑ 56๋ช…
Wrinkle, dermal-density and elasticity measures improved; several wrinkle measures favored 0.1%
์ฃผ๋ฆ„ยท์ง„ํ”ผ ๋ฐ€๋„ยทํƒ„๋ ฅ ์ง€ํ‘œ๊ฐ€ ๊ฐœ์„ ๋๊ณ , ์ผ๋ถ€ ์ฃผ๋ฆ„ ์ง€ํ‘œ๋Š” 0.1% ์ชฝ ๋ณ€ํ™”๊ฐ€ ๋” ์ปธ์Œ
Fixed left/right assignment; different co-ingredients; no vehicle-only side; one irritation withdrawal
์ขŒ์šฐ ๋ฐฐ์ •์ด ๊ณ ์ •๋๊ณ  ๋ถ€์„ฑ๋ถ„์ด ๋‹ฌ๋ž์œผ๋ฉฐ ๋ฐ”ํƒ• ์ œํ˜• ๋Œ€์กฐ๊ฐ€ ์—†๊ณ  ์ž๊ทน์œผ๋กœ 1๋ช…์ด ์ค‘๋‹จ
Head-to-head์ง์ ‘ ๋น„๊ต

Kim 2021
MLV-retinal 0.05%/0.1% vs same-number retinol on opposite face; 8 weeks; 23 Korean volunteers
๋‹ค์ธต์†Œํฌ ๋ ˆํ‹ฐ๋‚  0.05%ยท0.1%์™€ ๊ฐ™์€ ์ˆซ์ž์˜ ๋ ˆํ‹ฐ๋†€์„ ์–ผ๊ตด ์–‘์ชฝ์— ์‚ฌ์šฉ; 8์ฃผ; ํ•œ๊ตญ์ธ 23๋ช…
Both sides improved; MLV-retinal side improved more objective measures except dermal density
์–‘์ชฝ ๋ชจ๋‘ ๋ณ€ํ™”๊ฐ€ ์žˆ์—ˆ๊ณ , ์ง„ํ”ผ ๋ฐ€๋„๋ฅผ ์ œ์™ธํ•œ ๊ฐ๊ด€ ์ง€ํ‘œ๋Š” ๋‹ค์ธต์†Œํฌ ๋ ˆํ‹ฐ๋‚  ์ชฝ ๋ณ€ํ™”๊ฐ€ ๋” ํผ
Delivery system differs; n=23; equal percentages are not proven equivalent doses
์ „๋‹ฌ ์ œํ˜•์ด ๋‹ค๋ฅด๊ณ  23๋ช…๋ฟ์ด๋ฉฐ, ๊ฐ™์€ ํผ์„ผํŠธ๊ฐ€ ๋™๋“ฑ ์šฉ๋Ÿ‰์ธ์ง€ ์ž…์ฆ๋˜์ง€ ์•Š์Œ
Interpretation: 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.
ํ•ด์„: ์ง์ ‘ ๋น„๊ต ์—ฐ๊ตฌ๋Š” ํŠน์ • ๋‹ค์ธต์†Œํฌ ๋ ˆํ‹ฐ๋‚  ์ œํ˜•์ด ๋น„๊ต ๋Œ€์ƒ ๋ ˆํ‹ฐ๋†€ ์ œํ˜•๋ณด๋‹ค 8์ฃผ ๋™์•ˆ ์ผ๋ถ€ ์ง€ํ‘œ์—์„œ ๋” ํฐ ๋ณ€ํ™”๋ฅผ ๋ณด์˜€๋‹ค๋Š” ๋œป์ด๋‹ค. ๋ชจ๋“  ๋ ˆํ‹ฐ๋‚  ์ œํ’ˆ์ด ๋ชจ๋“  ๋ ˆํ‹ฐ๋†€ ์ œํ’ˆ๋ณด๋‹ค ๊ฐ•ํ•˜๋‹ค๋Š” ์ฆ๊ฑฐ๋Š” ์•„๋‹ˆ๋‹ค.
Before-and-after data
์‚ฌ์šฉ ์ „ํ›„ ์ž๋ฃŒ

Read change as study data,
not as a personal forecast

์—ฐ๊ตฌ ์† ๋ณ€ํ™”์™€
๋‚ด ๊ฒฐ๊ณผ๋ฅผ ๊ตฌ๋ถ„ํ•ด์•ผ ํ•œ๋‹ค

Retinal 0.05% vs 0.1% after 3 months
๋ ˆํ‹ฐ๋‚  0.05%์™€ 0.1%, 3๊ฐœ์›” ํ›„
Published group changes ยท Korean women, n=40 total
๋…ผ๋ฌธ์— ์ œ์‹œ๋œ ์ง‘๋‹จ ๋ณ€ํ™”์œจ ยท ํ•œ๊ตญ ์—ฌ์„ฑ ์ด 40๋ช…

Texture improvement
ํ”ผ๋ถ€๊ฒฐ ๊ฐœ์„ 

0.05%


12.6%
0.1%


13.7%

TEWL reduction
TEWL ๊ฐ์†Œ

0.05%


17.9%
0.1%


14.5%

Hydration increase
์ˆ˜๋ถ„ ์ฆ๊ฐ€

0.05%


6.0%
0.1%


10.2%

Melanin index
๋ฉœ๋ผ๋‹Œ ์ง€์ˆ˜

0.05%


NS
0.1%


โˆ’6.5%

The paper reported no significant between-group difference for the main biophysical outcomes; only the 0.1% group showed a significant melanin-index change. โ€œNSโ€ 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.

์ฃผ์š” ์ƒ์ฒด๋ฌผ๋ฆฌ ์ง€ํ‘œ์—์„œ๋Š” ๋‘ ๋†๋„ ์‚ฌ์ด์— ์œ ์˜ํ•œ ์ฐจ์ด๊ฐ€ ์—†์—ˆ๋‹ค. ๋ฉœ๋ผ๋‹Œ ์ง€์ˆ˜๋Š” 0.1%๊ตฐ์—์„œ๋งŒ ์œ ์˜ํ•˜๊ฒŒ ๋ณ€ํ–ˆ๋‹ค. โ€˜NSโ€™๋Š” ๋ณ€ํ™”๋Ÿ‰์ด 0์ด๋ผ๋Š” ๋œป์ด ์•„๋‹ˆ๋ผ ํ†ต๊ณ„์ ์œผ๋กœ ์œ ์˜ํ•˜์ง€ ์•Š์•˜๋‹ค๋Š” ์˜๋ฏธ๋‹ค. ์ง€ํ‘œ๋งˆ๋‹ค ์ฒ™๋„๊ฐ€ ๋‹ฌ๋ผ ๋ง‰๋Œ€ ๊ธธ์ด๋Š” ๊ฐ ์ƒ์ž ์•ˆ์—์„œ๋งŒ ๋น„๊ตํ•  ์ˆ˜ ์žˆ๋‹ค.

How to introduce one
without overloading the routine

๋ฃจํ‹ด์„ ๋ฌด๋ฆฌํ•˜๊ฒŒ ๋Š˜๋ฆฌ์ง€ ์•Š๊ณ 
์‹œ์ž‘ํ•˜๋Š” ๋ฐฉ๋ฒ•

A conservative start
๋ณด์ˆ˜์ ์œผ๋กœ ์‹œ์ž‘ํ•˜๊ธฐ

  • Use one vitamin A product, not retinol and retinal together.
  • Follow its label; a common clinical starting approach is alternate evenings, then adjust only if tolerated.
  • Apply moisturizer as needed and use broad-spectrum sunscreen during the day.
  • Do not increase concentration and frequency at the same time.
  • ๋ ˆํ‹ฐ๋†€๊ณผ ๋ ˆํ‹ฐ๋‚ ์„ ๋™์‹œ์— ๊ฒน์ณ ๋ฐ”๋ฅด์ง€ ๋ง๊ณ  ํ•˜๋‚˜๋งŒ ์„ ํƒํ•œ๋‹ค.
  • ์ œํ’ˆ ํ‘œ์‹œ์‚ฌํ•ญ์„ ์šฐ์„  ๋”ฐ๋ฅธ๋‹ค. ์ฒ˜์Œ์—๋Š” ๊ฒฉ์ผ ์ €๋…์ฒ˜๋Ÿผ ๊ฐ„๊ฒฉ์„ ๋‘๊ณ , ํ”ผ๋ถ€๊ฐ€ ๊ฒฌ๋”œ ๋•Œ๋งŒ ํšŸ์ˆ˜๋ฅผ ์กฐ์ ˆํ•œ๋‹ค.
  • ํ•„์š”ํ•˜๋ฉด ๋ณด์Šต์ œ๋ฅผ ํ•จ๊ป˜ ์“ฐ๊ณ  ๋‚ฎ์—๋Š” ์ž์™ธ์„  ์ฐจ๋‹จ์ œ๋ฅผ ๋ฐ”๋ฅธ๋‹ค.
  • ๋†๋„์™€ ์‚ฌ์šฉ ํšŸ์ˆ˜๋ฅผ ํ•œ๊บผ๋ฒˆ์— ์˜ฌ๋ฆฌ์ง€ ์•Š๋Š”๋‹ค.

What โ€œ8โ€“12 weeksโ€ means
โ€˜8~12์ฃผโ€™์˜ ์ •ํ™•ํ•œ ์˜๋ฏธ

It is a common assessment window in selected trialsโ€”not 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.

์ผ๋ถ€ ์‹œํ—˜์ด ๊ฒฐ๊ณผ๋ฅผ ํ™•์ธํ•œ ์‹œ์ ์ด์ง€, ๋ˆ„๊ตฌ์—๊ฒŒ๋‚˜ ๊ทธ๋•Œ ํšจ๊ณผ๊ฐ€ ์‹œ์ž‘๋œ๋‹ค๋Š” ๋œป์€ ์•„๋‹ˆ๋‹ค. ๋ ˆํ‹ฐ๋†€ ์—ฐ๊ตฌ๋Š” 4ยท8์ฃผ ๋˜๋Š” 24ยท52์ฃผ๋ฅผ ์‚ดํˆ๊ณ , ๋ ˆํ‹ฐ๋‚  ์—ฐ๊ตฌ๋Š” 8์ฃผ๋‚˜ 3๊ฐœ์›” ์‹œ์ ์— ํ‰๊ฐ€ํ–ˆ๋‹ค. ์ดˆ๋ฐ˜์— ๋”ฐ๊ฐ‘๊ณ  ๋ฒ—๊ฒจ์ง„๋‹ค๊ณ  ํ•ด์„œ ํšจ๊ณผ๊ฐ€ ์ž˜ ๋‚˜ํƒ€๋‚˜๋Š” ๊ฒƒ๋„ ์•„๋‹ˆ๋‹ค.

Who should be cautious
์ถ”์ฒœยท์ฃผ์˜ ๋Œ€์ƒ

Useful for some concerns,
not suitable for every moment

๊ณ ๋ฏผ์—๋Š” ๋งž์•„๋„
์ง€๊ธˆ ๋‚ด ํ”ผ๋ถ€์—๋Š” ์•ˆ ๋งž์„ ์ˆ˜ ์žˆ๋‹ค

Closest to studied users
์—ฐ๊ตฌ ๋Œ€์ƒ๊ณผ ๋น„๊ต์  ๊ฐ€๊นŒ์šด ์‚ฌ๋žŒ

  • Adults concerned about visible fine lines, rough texture or mottled pigmentation
  • People who can introduce one active slowly and maintain daytime sun protection
  • People choosing cosmetic appearance careโ€”not treatment of acne, eczema or pigment disease
  • ๋ˆˆ์— ๋ณด์ด๋Š” ์ž”์ฃผ๋ฆ„, ๊ฑฐ์นœ ํ”ผ๋ถ€๊ฒฐ, ์–ผ๋ฃฉ๋œ๋ฃฉํ•œ ์ƒ‰์†Œ ํ”์ ์„ ๊ด€๋ฆฌํ•˜๋ ค๋Š” ์„ฑ์ธ
  • ๊ธฐ๋Šฅ์„ฑ ์ œํ’ˆ์„ ํ•˜๋‚˜์”ฉ ์ฒœ์ฒœํžˆ ์ถ”๊ฐ€ํ•˜๊ณ  ๋‚ฎ ์ž์™ธ์„  ์ฐจ๋‹จ์„ ๋ณ‘ํ–‰ํ•  ์‚ฌ๋žŒ
  • ์—ฌ๋“œ๋ฆ„ยท์Šต์ง„ยท์ƒ‰์†Œ์งˆํ™˜ ์น˜๋ฃŒ๊ฐ€ ์•„๋‹ˆ๋ผ ํ™”์žฅํ’ˆ ๋ฒ”์œ„์˜ ์™ธ๊ด€ ๊ด€๋ฆฌ๋ฅผ ์›ํ•˜๋Š” ์‚ฌ๋žŒ

Avoid or seek individual advice
ํ”ผํ•˜๊ฑฐ๋‚˜ ์ „๋ฌธ๊ฐ€์™€ ๋จผ์ € ์ƒ์˜ํ•  ์‚ฌ๋žŒ

  • Pregnant people or those planning pregnancy: avoid retinoid products as a precaution and ask a clinician
  • Active dermatitis, damaged skin barrier or recent procedures: wait and obtain professional guidance
  • Persistent burning, swelling, marked redness or peeling: stop rather than โ€œpush throughโ€
  • Prescription retinoid users: do not add a cosmetic retinoid without the prescriber’s advice
  • ์ž„์‹  ์ค‘์ด๊ฑฐ๋‚˜ ์ž„์‹ ์„ ์ค€๋น„ ์ค‘์ด๋ผ๋ฉด ์˜ˆ๋ฐฉ ์›์น™์ƒ ๋ ˆํ‹ฐ๋…ธ์ด๋“œ ์ œํ’ˆ์„ ํ”ผํ•˜๊ณ  ์˜๋ฃŒ์ง„๊ณผ ์ƒ์˜ํ•œ๋‹ค.
  • ํ”ผ๋ถ€์—ผ์ด ์‹ฌํ•˜๊ฑฐ๋‚˜ ์žฅ๋ฒฝ์ด ์†์ƒ๋๊ฑฐ๋‚˜ ์ตœ๊ทผ ์‹œ์ˆ ์„ ๋ฐ›์•˜๋‹ค๋ฉด ํšŒ๋ณต ํ›„ ์ „๋ฌธ๊ฐ€์˜ ์•ˆ๋‚ด๋ฅผ ๋ฐ›๋Š”๋‹ค.
  • ํ™”๋ˆ๊ฑฐ๋ฆผ, ๋ถ€๊ธฐ, ์‹ฌํ•œ ๋ถ‰์–ด์ง์ด๋‚˜ ๋ฒ—๊ฒจ์ง์ด ๊ณ„์†๋˜๋ฉด โ€˜์ ์‘ ๊ณผ์ •โ€™์ด๋ผ ๋ฒ„ํ‹ฐ์ง€ ๋ง๊ณ  ์ค‘๋‹จํ•œ๋‹ค.
  • ์ฒ˜๋ฐฉ ๋ ˆํ‹ฐ๋…ธ์ด๋“œ๋ฅผ ์“ฐ๋Š” ์ค‘์ด๋ผ๋ฉด ์ฒ˜๋ฐฉ ์˜๋ฃŒ์ง„๊ณผ ์ƒ์˜ ์—†์ด ํ™”์žฅํ’ˆ ๋ ˆํ‹ฐ๋…ธ์ด๋“œ๋ฅผ ๋”ํ•˜์ง€ ์•Š๋Š”๋‹ค.
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.
EMA์˜ ์ž„์‹  ๊ฒฝ๊ณ ๋Š” ํŠธ๋ ˆํ‹ฐ๋…ธ์ธยท์•„๋‹คํŒ”๋ Œ ๊ฐ™์€ ์˜์•ฝํ’ˆ ๊ตญ์†Œ ๋ ˆํ‹ฐ๋…ธ์ด๋“œ๋ฅผ ์ง์ ‘ ๋‹ค๋ฃจ๋ฉฐ, ๋ฏธ๊ตญํ”ผ๋ถ€๊ณผํ•™ํšŒ๋Š” ์ผ๋ฐ˜ ํ™”์žฅํ’ˆ์˜ ๋ ˆํ‹ฐ๋†€๋„ ์ž„์‹  ์ค‘ ํ”ผํ•˜๋ผ๊ณ  ์•ˆ๋‚ดํ•œ๋‹ค. ํ™”์žฅํ’ˆ ๋ ˆํ‹ฐ๋‚ ๋งŒ ๋”ฐ๋กœ ์ž„์‹ ๋ถ€์—๊ฒŒ ์‹œํ—˜ํ•ด ์•ˆ์ „์„ฑ์„ ํ™•์ธํ•œ ์ž๋ฃŒ๋Š” ์—†๋‹ค. ๋”ฐ๋ผ์„œ ์ž„์‹ ยท์ž„์‹  ์ค€๋น„ ์ค‘ ํ”ผํ•˜๋ผ๋Š” ๊ฒƒ์€ ์˜ˆ๋ฐฉ์  ๊ถŒ๊ณ ์ด์ง€, ํ™”์žฅํ’ˆ์˜ ๊ตญ์†Œ ๋…ธ์ถœ์ด ์œ„ํ•ด๋ฅผ ์ผ์œผํ‚จ๋‹ค๊ณ  ์ž…์ฆ๋๋‹ค๋Š” ์˜๋ฏธ๋Š” ์•„๋‹ˆ๋‹ค.

The conflict check
changes how we read certainty

๋ˆ„๊ฐ€ ์—ฐ๊ตฌํ–ˆ๋Š”์ง€๊นŒ์ง€ ๋ด์•ผ
ํ™•์‹ ์˜ ์ •๋„๊ฐ€ ๋ณด์ธ๋‹ค

Study
์—ฐ๊ตฌ
Disclosed context
๊ณต๊ฐœ๋œ ๋ฐฐ๊ฒฝ
Kafi 2007 Indexed as NIH and non-U.S. government supported; some investigators were applicants on related skin-aging treatment patents.
NIH ๋ฐ ๋ฏธ๊ตญ ์™ธ ์ •๋ถ€ ์ง€์› ์—ฐ๊ตฌ๋กœ ์ƒ‰์ธ๋˜์–ด ์žˆ์œผ๋ฉฐ, ์ผ๋ถ€ ์—ฐ๊ตฌ์ž๋Š” ๊ด€๋ จ ํ”ผ๋ถ€ ๋…ธํ™” ์น˜๋ฃŒ ํŠนํ—ˆ์˜ ์ถœ์›์ž์˜€๋‹ค.
Tucker-Samaras 2009 The author affiliation includes Johnson & Johnson Consumer Companies, so product-development involvement should be considered.
์ €์ž ์†Œ์†์— Johnson & Johnson Consumer Companies๊ฐ€ ํฌํ•จ๋ผ ์žˆ์–ด ์ œํ’ˆ ๊ฐœ๋ฐœ์‚ฌ์˜ ๊ด€์—ฌ ๊ฐ€๋Šฅ์„ฑ์„ ํ•จ๊ป˜ ๊ณ ๋ คํ•ด์•ผ ํ•œ๋‹ค.
Kwon 2018 The abstract alone is insufficient to verify all funding and conflict statements.
์ดˆ๋ก๋งŒ์œผ๋กœ๋Š” ์—ฐ๊ตฌ๋น„์™€ ์ดํ•ด๊ด€๊ณ„ ๊ณต๊ฐœ ๋‚ด์šฉ์„ ๋ชจ๋‘ ํ™•์ธํ•˜๊ธฐ ์–ด๋ ต๋‹ค.
Deda 2026 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.
์‹ค๋ ˆ์‹œ์•„ ์˜๊ณผ๋Œ€ํ•™๊ณผ ์ œํ’ˆ์‚ฌ PH Doctor์˜ ์ง€์›์„ ๋ฐ›์•˜๊ณ  ์ œํ’ˆ์‚ฌ ์ง์›์ด ๊ณต์ €์ž๋กœ ์ฐธ์—ฌํ–ˆ๋‹ค. ์ €์ž๋“ค์€ ํ›„์›์‚ฌ๊ฐ€ ์ž๋ฃŒ ์ˆ˜์ง‘ยทํ•ด์„ยท์›๊ณ  ์ž‘์„ฑ์— ๊ด€์—ฌํ•˜์ง€ ์•Š์•˜๋‹ค๊ณ  ๋ฐํ˜”๋‹ค.
Kim 2021 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.
์ €์ž๋“ค์€ ์ดํ•ด๊ด€๊ณ„๊ฐ€ ์—†๋‹ค๊ณ  ๋ณด๊ณ ํ–ˆ๋‹ค. ๊ณต๊ฐœ ์ดˆ๋ก๋งŒ์œผ๋กœ ์—ฐ๊ตฌ๋น„๋Š” ํ™•์ธ๋˜์ง€ ์•Š์•˜์œผ๋ฉฐ, ์„ฑ๋ถ„ ๋‹จ๋…์ด ์•„๋‹ˆ๋ผ ์™„์ œํ’ˆ ์ œํ˜•๋ผ๋ฆฌ์˜ ๋น„๊ต๋ผ๋Š” ํ•œ๊ณ„๊ฐ€ ๋‚จ๋Š”๋‹ค.

Industry involvement does not make a result false. It does lower confidence when methods, complete numerical results or independent replications are limited.

๊ธฐ์—…์ด ๊ด€์—ฌํ–ˆ๋‹ค๊ณ  ๊ฒฐ๊ณผ๊ฐ€ ๊ณง๋ฐ”๋กœ ํ‹€๋ฆฐ ๊ฒƒ์€ ์•„๋‹ˆ๋‹ค. ๋‹ค๋งŒ ๋ฐฉ๋ฒ•๊ณผ ์ „์ฒด ์ˆ˜์น˜๊ฐ€ ์ถฉ๋ถ„ํžˆ ๊ณต๊ฐœ๋˜์ง€ ์•Š์•˜๊ฑฐ๋‚˜ ๋…๋ฆฝ ์—ฐ๊ตฌ์ง„์˜ ๋ฐ˜๋ณต ๊ฒ€์ฆ์ด ๋ถ€์กฑํ•˜๋ฉด ํ™•์‹ ์˜ ์ˆ˜์ค€์„ ๋‚ฎ์ถฐ ์ฝ์–ด์•ผ ํ•œ๋‹ค.

Traceable sources
์ถ”์  ๊ฐ€๋Šฅํ•œ ์ถœ์ฒ˜

References
์ฐธ๊ณ ๋ฌธํ—Œ

  1. Kafi R, et al. Improvement of naturally aged skin with vitamin A (retinol). Arch Dermatol. 2007;143(5):606-612. doi:10.1001/archderm.143.5.606.
  2. Tucker-Samaras S, et al. A stabilized 0.1% retinol facial moisturizer improves the appearance of photodamaged skin. J Drugs Dermatol. 2009;8(10):932-936.
  3. Randhawa M, et al. One-year topical stabilized retinol treatment improves photodamaged skin. J Drugs Dermatol. 2015;14(3):271-280.
  4. Saurat JH, et al. Topical retinaldehyde on human skin: biologic effects and tolerance. J Invest Dermatol. 1994;103(6):770-774. doi:10.1111/1523-1747.ep12412861.
  5. Creidi P, Humbert P. Clinical use of topical retinaldehyde on photoaged skin. Dermatology. 1999;199 Suppl 1:49-52. doi:10.1159/000051379.
  6. Fluhr JW, et al. Tolerance profile of retinol, retinaldehyde and retinoic acid. Dermatology. 1999;199 Suppl 1:57-60. doi:10.1159/000051381.
  7. Kwon HS, et al. 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.
  8. Deda A, et al. 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.
  9. Kim J, et al. Efficacy and safety of multilamellar vesicle containing retinaldehyde. J Cosmet Dermatol. 2021;20(9):2874-2879. doi:10.1111/jocd.13993.
  10. Scientific Committee on Consumer Safety. Opinion on Vitamin A. SCCS/1576/16.
  11. European Commission. Commission Regulation (EU) 2024/996.
  12. European Medicines Agency. Retinoid-containing medicinal products: pregnancy-prevention measures.
  13. American Academy of Dermatology. Dermatologist-approved pregnancy skin care.
  14. ์‹ํ’ˆ์˜์•ฝํ’ˆ์•ˆ์ „์ฒ˜. ๊ธฐ๋Šฅ์„ฑํ™”์žฅํ’ˆ ๊ธฐ์ค€ ๋ฐ ์‹œํ—˜๋ฐฉ๋ฒ• ๋ณ„ํ‘œ 3.
  15. ์‹ํ’ˆ์˜์•ฝํ’ˆ์•ˆ์ „์ฒ˜. ๊ธฐ๋Šฅ์„ฑํ™”์žฅํ’ˆ ์‹ฌ์‚ฌ ๊ทœ์ •: ์ž๋ฃŒ ์ œ์ถœ์ด ์ƒ๋žต๋˜๋Š” ๊ธฐ๋Šฅ์„ฑํ™”์žฅํ’ˆ์˜ ์ข…๋ฅ˜(๋ณ„ํ‘œ 4).
  16. NIH Office of Dietary Supplements. Vitamin A and Carotenoids: Health Professional Fact Sheet.

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