Adenosine: a listed wrinkle active in Korea, yet we found no trial against vehicle

At 0.04% a product can be filed as a wrinkle-improvement functional cosmetic without submitting data. But the only human trial we found in the published literature had 22 participants, and its comparator was not vehicle but another adenosine formulation.

Last checked Sep 16, 2026

In pregnancy: Not established
Irritation: Minimal
Daytime use: ✓ Fine

Not a measurement — reported irritation grouped into five steps. It varies between people.

Adenosine is the wrinkle active you see most often on Korean ingredient lists. Unlike retinol it barely irritates and it is stable, so products promising gentle wrinkle care mostly use it.

And yet human evidence for it is surprisingly hard to find in the published literature. Being a listed active and having a body of published trials are different things.

What is established

The same ingredient at a different strength, in a different formula, is a different product. These are the conditions the studies used.

Ingredient dataConcentration studied 0.04%

The listed amount is 0.04%

Annex 4, item 3 of the Regulation on the Review of Functional Cosmetics names four wrinkle-improvement actives, and adenosine sits at 0.04% — alongside retinol at 2,500 IU/g (0.075%), retinyl palmitate at 10,000 IU/g and polyethoxylated retinamide at 0.05–0.2%.

At that concentration a product can be filed for the claim without submitting its own data.

Being a listed active means the ministry reviewed efficacy data at some point. It does not mean that data is retrievable as published literature. That is what the next entry is about.

기능성화장품 심사에 관한 규정 [별표 4] 자료제출이 생략되는 기능성화장품의 종류 — 식품의약품안전처고시 제2025-88호

Not establishedConcentration studied 0.04% · cream

The trial we found had 22 people and compared it against another adenosine formulation

A 10-week study in 22 women with crow's feet. On one side, an adenosine-loaded dissolving microneedle patch was applied every three days for eight weeks; on the other, an adenosine cream twice daily for eight weeks.

Both arms improved significantly from baseline on almost all parameters (P < .05), and the patch was similar to or better than the cream.

The problem is the design. Both sides received adenosine. With no vehicle-only side, the trial cannot separate the improvement from the effect of applying something around the eyes consistently for eight weeks.

So: not established. Not that it does nothing, but that we found nothing in the published literature confirming it against vehicle (PubMed, checked 16 September 2026).

Randomised controlled trial in people · 22 participants · 8 weeks · Compared with another active ingredient · Funding not declared · Endpoint scores from blinded assessors PMID 29574973

How to use it

It barely irritates, so morning or evening, layered with other ingredients, is all fine.
Check the concentration. A functional-cosmetic label suggests at least 0.04%, but the label alone does not tell you.
Choosing it as an alternative when skin cannot tolerate retinol is reasonable. The evidence is thicker on the retinol side, though.

Cautions

We found no established data on use during pregnancy.
A 'wrinkle-improvement functional cosmetic' label means the product completed its filing, not that a trial found a large effect.

With a new ingredient, apply a small amount somewhere inconspicuous, such as the inner arm, for two days first. Stop if it reddens or stings.

Products naming this ingredient

Products here are examples, not recommendations. Nothing is ranked or scored; the evidence sits with the ingredient.

WhiteningWrinkle improvement

멀티펩타이드와아데노신세럼

Responsible distributor · (주)코스메디크

Filed efficacy statement피부의 미백에 도움을 준다. 피부의 주름개선에 도움을 준다.

Ingredients named in the product name: Adenosine not disclosed
Filing completed: 2025-06-19

Verify in the filing register