Adenosine Skincare in Korea: What the 2025 MFDS Codex Sets

Adenosine is one of only four ingredients that Korea's Ministry of Food and Drug Safety (MFDS) lists in the wrinkle section of its functional cosmetics codex, and it is the one that turns up most often in that codex's combination products. A Korean cream sold as a functional cosmetic for wrinkles can rely on adenosine because of that listing. The MFDS codex also fixes hard numbers: the raw ingredient must assay at 99.0% or more, and every finished adenosine product must hold at least 90.0% of the amount printed on its label.

This page reads two Korean legal texts and nothing else. One is the MFDS notice "Standards and Test Methods for Functional Cosmetics" (기능성화장품 기준 및 시험방법), whose own first annex gives its English name as the Korean Functional Cosmetics Codex (KFCC). The edition used is MFDS Notice No. 2025-89, amended 16 December 2025. The other is Article 2 of the Enforcement Rule of the Cosmetics Act, which lists the functional types a product may claim. Both were read in Korean, from the annex files of the notice, with a check date of 12 October 2026. Korean statutes and government notices are not protected by copyright (Copyright Act, Article 7), so the wording below is quoted directly. No product is named or ranked here.

Where does adenosine sit in the Korean codex?

It sits in Annex 3, titled 피부의 주름개선에 도움을 주는 기능성화장품 각조, "monographs for functional cosmetics that help improve skin wrinkles". Annex 3 has raw-ingredient monographs for exactly four substances:

• Retinol
• Retinyl palmitate
• Adenosine
• Polyethoxylated retinamide

That is the whole wrinkle list. If an article tells you that some other trending ingredient is "approved for wrinkles in Korea", check whether it appears in Annex 3 or in the combination annex; if it appears in neither, the codex does not support the claim.

The codex is a quality rulebook, not a list of permitted ingredients. Rule 1 of its general annex says the notice defines the range in which a company applying for functional cosmetic review may be excused from submitting its own standards and test methods. In plain words: when an ingredient has a monograph here, the regulator has already written the tests for it.

What numbers does the adenosine monograph set?

The raw-ingredient monograph for adenosine gives the following. Values are copied from the Korean text; the English wording is ours.

The figures that follow are as printed in the MFDS Korean Functional Cosmetics Codex (KFCC, MFDS Notice No. 2025-89).

Item in the monograph	What the codex states
Formula and weight	C10H13N5O4, 267.24
Other name in the codex	Adenine riboside
Assay (raw ingredient)	99.0% or more
Description	Colourless crystals or crystalline powder, odourless
Melting point	234-235 °C
Specific rotation	-58 to -62°
Heavy metals	10 ppm or less
Adenine	No adenine spot may appear in the thin-layer test
Loss on drying	1.0% or less
Residue on ignition	0.1% or less

The monograph also describes four identification tests, including an ultraviolet absorbance check at 250, 260 and 280 nm in which the ratio A1/A2 must be 0.79±0.02 and A3/A2 must be 0.15±0.01. Two assay methods are written out, one by ultraviolet absorbance near 260 nm and one by liquid chromatography.

What is "adenosine solution (2%)"?

Right after the main monograph, Annex 3 adds a second raw material: adenosine solution (2%). The MFDS codex describes it as codex-grade adenosine mixed with lecithin from soybeans, butylene glycol and similar ingredients, then emulsified under high pressure into a uniform material. Its numbers:

Same source, the MFDS codex:

• Adenosine content 1.90-2.10% when assayed
• A white emulsion with a characteristic odour
• pH 3.5-5.5
• Specific gravity 0.95-1.05
• Heavy metals 10 ppm or less, arsenic 2 ppm or less

This "2%" describes a raw material a manufacturer can buy. It is not a statement that a finished product contains 2% adenosine, and the MFDS codex does not say what percentage a cream should use.

Which adenosine products have their own monographs?

Annex 3 has five dosage-form monographs built on adenosine. Each opens with the same rule about content.

Same source, the MFDS codex:

Monograph	Content rule	pH line
Adenosine lotion	90.0% or more of the labelled amount	Standard value ±1.0, within 3.0-9.0
Adenosine solution	90.0% or more of the labelled amount	Standard value ±1.0, within 3.0-9.0
Adenosine cream	90.0% or more of the labelled amount	Standard value ±1.0, within 3.0-9.0
Adenosine soaked mask	90.0% or more of the labelled amount	Tested on the pressed-out liquid, ±1.0, within 3.0-9.0
Adenosine solid	90.0% or more of the labelled amount	±1.0, within 3.0-9.0; water-free products excluded

Each dosage-form monograph says the product is made with adenosine as its main (functional) ingredient and may contain stabilisers, humectants, moisturisers, pH adjusters, colourants and fragrance to improve stability and usefulness; the lotion, cream, mask and solid also list emulsifiers. The soaked mask is defined as a solution or lotion simply soaked into a support such as non-woven fabric, so its tests run on the liquid pressed out of the sheet.

Why does adenosine appear in so many combination products?

Annex 5 covers products that help with both whitening and wrinkle improvement. It holds 21 combination monographs, and 20 of them pair adenosine with a whitening ingredient. The one exception is an arbutin and retinol cream.

Partner ingredient (whitening)	Combination monographs with adenosine
Niacinamide	Lotion, solution, cream, soaked mask (4)
Ascorbyl glucoside	Solution (1)
Arbutin	Lotion, solution, cream, soaked mask (4)
Alpha-bisabolol	Lotion, solution, cream, soaked mask (4)
Ethyl ascorbyl ether	Lotion, solution, cream, soaked mask (4)
Oil soluble licorice extract	Lotion, solution, cream (3)

So when a Korean label carries both a brightening and a wrinkle claim, the combination monographs show the pattern the regulator expected: one ingredient from the whitening annex for the brightening side, and adenosine (or, in one case, retinol) for the wrinkle side. In each of these combinations the MFDS codex requires the finished product to contain at least 90.0% of the labelled amount of both ingredients.

Which claim does the listing allow?

The claim comes from Article 2, item 3 of the Enforcement Rule of the Cosmetics Act. In the original:

피부에 탄력을 주어 피부의 주름을 완화 또는 개선하는 기능을 가진 화장품

In English: a cosmetic with the function of giving the skin elasticity and so easing or improving skin wrinkles. The annex title of the codex is softer still, using "helps improve" (주름개선에 도움을 주는).

Two practical readings follow. First, the legal words are "ease or improve", not "remove", "reverse" or "repair". Treatment and regeneration language is drug language in Korea, and it sits outside cosmetic law. Second, the claim belongs to the product that passed functional review, not to the ingredient in the abstract. A codex monograph is a quality standard; it contains no clinical results.

Adenosine reading checklist

Same source, the MFDS codex:

• The label should show the functional cosmetic marking with a wrinkle type
• Adenosine should be the named functional ingredient for that wrinkle claim
• A brightening-plus-wrinkle product matches the Annex 5 pattern of one whitening ingredient plus adenosine
• Treat "eases or improves" as the legal ceiling; erase or repair words are outside it
• Do not read "2%" on a raw material as a product percentage

How to check a claim yourself, step by step

• Find the functional type on the label (wrinkle, whitening, or both).
• Open the codex on the Korean Law Information Center and go to Annex 3 for wrinkle ingredients.
• If the product claims both, look up the pair in Annex 5.
• Compare the label wording with Article 2, item 3 of the Enforcement Rule.
• Treat any percentage claim as coming from somewhere other than this codex.

What this page does not cover

• How much adenosine a product uses or may use. Usage amounts sit in other MFDS rules that this page has not read; the codex sets quality, not dose.
• Whether adenosine works for any particular person. The codex holds no clinical data and none is added here.
• Products, brands, prices and rankings. Left out on purpose.
• Other countries. The US, EU and others classify cosmetic ingredients differently. This is about Korea only.

Other ingredients from the same codex, grouped by functional type, are in our K-beauty functional ingredient index.

Sources and how to check

• 기능성화장품 기준 및 시험방법 (Standards and Test Methods for Functional Cosmetics, KFCC), MFDS Notice No. 2025-89, amended 16 December 2025: Annex 1 (general rules), Annex 3 (wrinkle monographs), Annex 5 (whitening and wrinkle combinations). Korean Law Information Center: https://www.law.go.kr/LSW/admRulInfoP.do?admRulSeq=2100000269816&chrClsCd=010201
• 화장품법 시행규칙 제2조 (Enforcement Rule of the Cosmetics Act, Article 2: scope of functional cosmetics), item 3 quoted above: https://www.law.go.kr/법령/화장품법 시행규칙/제2조
• Checked as of 12 October 2026, against the annex files of the notice. Licence: Korean statutes and notices are unprotected works under Copyright Act Article 7.

Editor's note

Checked: the adenosine raw monograph values, the adenosine solution (2%) values, the five dosage-form monographs and their 90.0% rule and pH lines, the 20 adenosine combinations in Annex 5, and the wording of Enforcement Rule item 3.

Not checked: permitted use amounts, which sit in other MFDS rules, and any clinical effect.

Left out on purpose: product names, prices, rankings, before-and-after claims and anything stronger than "eases or improves wrinkles".