Ingredient Beauty BenefitsOther · Adenosine
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
Start here
- What it is
A substance present everywhere in the body. It is one of Korea's four listed actives for wrinkle claims, at a listed concentration of 0.04%.
- What it is used for
Wrinkles.
- How it is said to work
It is said to bind particular receptors on the cell surface and increase signalling toward collagen production.
There are no numbers and no citations in this box. What has been established, and how far, is below.
At a glance
- In pregnancy
- Not established
- Irritation
- Minimal
- Daytime use
- ✓ Fine
- How well established
- Ingredient data
- Concentration studied
- 0.04%
- Length of the studies
- 8 weeks
Not a measurement — reported irritation grouped into five steps. It varies between people.
“Concentration studied” and “Length of the studies” are taken straight from the research on this page. They are not a recommended dose, and the figure for each finding is written out in the text.
This is not how large the effect is but how well confirmed it is. It shows the highest grade among the findings on this page.
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.
Contents
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.
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.
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 · abstract read
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.
Related skin concerns
What this article relies on
Unless marked otherwise, a paper was read to the abstract. Only papers whose full text we opened are marked as such.
- 기능성화장품 심사에 관한 규정 [별표 4] 자료제출이 생략되는 기능성화장품의 종류 — 식품의약품안전처고시 제2025-88호식품의약품안전처 · 시행 2025-12-16 · Checked on 2026-09-16
- PubMed — 미국 국립의학도서관 문헌 데이터베이스National Library of Medicine · Checked on 2026-09-16