What does NAG (N-Acetyl Glucosamine) do?#
N-Acetyl Glucosamine (NAG) is a gentle amino sugar that helps reduce the appearance of dark spots and uneven skin tone. It approaches brightening differently from most ingredients, so it sits comfortably alongside them in a routine.
Benefits
- Helps reduce the visible appearance of dark spots and uneven skin tone
- Approaches brightening differently from most ingredients, and sits comfortably alongside them
- Gentle and well-tolerated, suitable for daily use
- Also helps skin look brighter and feel smoother
How it works
NAG is a naturally occurring amino sugar found in the outer shells of crustaceans and in certain fungi, though it can also be made without any shellfish at all. It approaches brightening from a different angle than most ingredients, which is why it sits comfortably alongside them in a routine. NAG also helps skin look healthier and promotes a smoother, more refined-looking texture alongside its tone-evening benefits.
How to use NAG (N-Acetyl Glucosamine)#
Before you start
If your skin is easily irritated, or broken right now, let it settle before you start.
How often
Twice a day is fine, from the first day. Most people have no settling-in period to push through and no purge, and there is no need to build up slowly.
Where it goes
After cleansing, before moisturizer.
Where to apply
Across the face, and down onto the neck if that is where you want to even things out.
Sun
Wear sunscreen daily. N-acetyl glucosamine isn't one of the actives we flag for extra sun care - and sun exposure is what drives the look of the marks you're working on, so daily protection earns its place either way.
Alongside others
Niacinamide is the partner it has been studied alongside most often.
It sits comfortably next to other brightening ingredients. It works a different way from most of them, so it does not need an evening of its own.
What to expect
Expect it to work gradually. This is a several-weeks ingredient rather than a several-days one, so the useful thing is to keep going.
Discontinue use if unexpected discomfort occurs.
The form you will see it in
N-Acetyl Glucosamine brightening serum
- Where it goes
- Before moisturizer
Using NAG (N-Acetyl Glucosamine) with other ingredients
Pairs well with NAG (N-Acetyl Glucosamine)
Niacinamide
Works well togetherA great pairing for NAG — together they support a more even, radiant-looking complexion.
What not to use with NAG (N-Acetyl Glucosamine)
Nothing flagged. None of the ingredients this wiki covers needs to be kept apart from NAG (N-Acetyl Glucosamine) — check the label of anything not covered here.
Who should avoid NAG (N-Acetyl Glucosamine)?#
Six situations change whether NAG (N-Acetyl Glucosamine) suits your skin right now. Each one is either a reason to skip it, a reason to go slowly, or nothing to watch for.
- Fragile or Sensitive
- Go slowly
- Recent Facial or Laser
- Go slowly
- Maternity & Nursing
- No caution
- Prone to Redness
- No caution
- Dry or Itchy Patches
- No caution
- Recent Shave or Wax
- No caution
Fragile or Sensitive — Use it less often — or stop — if it feels uncomfortable, and keep it off skin that’s broken, cut or sunburned.
Recent Facial or Laser — Wait until your skin feels settled before reintroducing — typically 7 to 14 days after a facial or laser appointment.
Cosmetic strength limits for NAG (N-Acetyl Glucosamine) where you live#
| Region | Most a cosmetic may contain | |
|---|---|---|
 United States | No explicit cap | |
The FDA restricts a short list of ingredients and sets no general strength ceiling on the rest. A figure marked "guidance, not law" is the Cosmetic Ingredient Review panel's recommendation. 21 CFR part 700, subpart B — Requirements for Specific Cosmetic Products (FDA) | ||
 Canada | No explicit cap | |
One list does the work — Health Canada's Hotlist of prohibited and restricted cosmetic ingredients. | ||
 European Union | No explicit cap | |
The Cosmetics Regulation's annexes, consolidated to 1 May 2026. A figure marked "guidance, not law" comes from the EU's cosmetic safety committee rather than from the annexes. | ||
 Great Britain | No explicit cap | |
Great Britain kept the annexes as its own law and updates them only when it chooses; Northern Ireland follows the live EU Regulation, which is why some rows read differently for each. Regulation (EC) No 1223/2009 as it applies in Great Britain · Regulation (EC) No 1223/2009, Annexes II–VI | ||
 India | No explicit cap | |
India writes its own standard, aligned to the European rules as they stood in 2012. Mandatory since 9 February 2026. IS 4707 (Part 2):2025 — restricted and prohibited cosmetic ingredients · IS 4707 (Part 3):2025 — preservatives · Cosmetics Rules, 2020, Ninth Schedule | ||
 Brazil | No explicit cap | |
ANVISA rewrote its restricted list in June 2026, and a companion act amended the prohibited list at the same time. RDC 1.029/2026 — restricted ingredients · RDC 529/2021 — prohibited ingredients, as amended by RDC 1.030/2026 · RDC 528/2021 — preservatives | ||
 Japan | No explicit cap | |
Japan's cosmetics standard keeps drug ingredients out of cosmetics, so most of its figures sit in the ministry's list of the ones a cosmetic may still contain. Cosmetics Standards (化粧品基準), Ministry of Health, Labour and Welfare · Cosmetics Standards — the ministry's own English translation · Drug ingredients permitted in cosmetics — 2007 notification | ||
 South Korea | No explicit cap | |
One MFDS regulation carries both the prohibited list and the restricted list, in force 18 March 2026. Sunscreens and a few other categories are cleared product by product instead. Regulation on Safety Standards for Cosmetics (MFDS Notification 2026-19) · Regulation on the Review of Functional Cosmetics (MFDS Notification 2025-88) | ||
 Kenya | No explicit cap | |
Kenya's standard applies the EU annexes as they stand rather than copying them, so its ingredient limits are the EU's — including the 2024 additions. A figure marked "guidance, not law" sits outside the annexes and does not carry over. KS EAS 377-1, -2 and -3:2022 — cosmetics safety requirements, published by KEBS · Regulation (EC) No 1223/2009, Annexes II–VI | ||
 Namibia | No explicit cap | |
Namibia sets no ingredient limits at all. Its cosmetic rule is a single line requiring a product to be free of any harmful ingredient. Foodstuffs, Cosmetics and Disinfectants Ordinance 18 of 1979, and the regulations under it | ||
 Ukraine | No explicit cap | |
Ukraine's own transposition of the EU annexes, as they stood before the 2024 additions, fully in force since 3 August 2026. A further revision is due on 1 February 2027. Technical Regulation on cosmetic products — Cabinet Resolution No. 65 of 20 January 2021 | ||
 Georgia | No explicit cap | |
Georgia has no cosmetics rulebook — its register of technical regulations carries no cosmetics entry — so only the general product-safety duty applies. | ||
 Australia | No explicit cap | |
Australia writes no cosmetic ingredient list. A figure here is the point at which a substance becomes a medicine or a scheduled substance carrying Caution labeling, so its numbers sit well above other markets'. Poisons Standard — June 2026 · Therapeutic Goods (Excluded Goods) Determination 2018 | ||
 United Arab Emirates | No explicit cap | |
The Gulf standard points at the EU annexes as amended, so its ingredient limits are the EU's. A figure marked "guidance, not law" sits outside the annexes and does not carry over. GSO 1943:2024 — Cosmetic products: safety requirements (Gulf technical regulation) · Regulation (EC) No 1223/2009, Annexes II–VI | ||
 Kuwait | No explicit cap | |
The Gulf standard points at the EU annexes as amended, so its ingredient limits are the EU's. A figure marked "guidance, not law" sits outside the annexes and does not carry over. GSO 1943:2024 — Cosmetic products: safety requirements (Gulf technical regulation) · Regulation (EC) No 1223/2009, Annexes II–VI | ||
 Hong Kong | No explicit cap | |
Hong Kong writes no cosmetics rulebook. Its Poisons List (Cap. 138A, Schedule 10) decides which substances may be sold only as medicines, and general safety is judged case by case against whichever overseas standard the enforcer considers reasonable. Pharmacy and Poisons Regulations (Cap. 138A), Schedule 10 — the poisons list · Pharmacy and Poisons Board — Guidance Notes on classifying pharmaceutical products, April 2026 | ||
 Singapore | No explicit cap | |
Singapore writes the ASEAN annexes into its own schedule, and its regulator tells companies to check the current ASEAN release as well — which is why a figure here can read "guidance, not law". Health Products (Cosmetic Products — ASEAN Cosmetic Directive) Regulations 2007, Third Schedule · ASEAN Cosmetic Directive annexes — release 2026-1, 22 June 2026 | ||
 Brunei | No explicit cap | |
Brunei carries the 2007 ASEAN annexes in its own schedule and has not updated them since, so it reads differently from Singapore on several ingredients. Medicines (Cosmetic Products) Regulations (Cap. 285 Rg 1), Schedule 1 — revised edition 2024 | ||
 Jordan | No explicit cap | |
Jordan's cosmetic rules defer to "the approved references" and name none of them, so there is no Jordanian figure to read. The only number in the instrument governs the ingredient list on the pack. JFDA instructions on cosmetics and pharmaceutical cosmetics, 2026 | ||
 Trinidad & Tobago | No explicit cap | |
Trinidad and Tobago has had the power to set cosmetic standards since 1960 and has never used it. The regulations made under the Act cover food and drugs, with no cosmetics part; what binds is the Act's general rule against selling a cosmetic that may injure the user. Food and Drugs Act, Chap. 30:01 · Food and Drugs Regulations | ||
No cosmetic regulator in the 20 markets above sets a maximum strength for nag (n-acetyl glucosamine). That is the state of the rules, not a signal to use more: how much goes into a product is the formulator's decision.
Open a market to see the rulebook its figure comes from. Those notes describe each market's own rules as we read them, current to August 24, 2026; the linked documents are the authority, and nothing here is legal advice.
Sample products with NAG (N-Acetyl Glucosamine)#
A few well-known products, not a full list — product names are each brand's own. We don't sell them — the shop prices them in US dollars and ships from Hong Kong, so delivery and duties come on top. It may not ship everywhere.
We may earn a small commission when you buy through these links.
Already have one? Check how it fits your skin with Pick.
Common questions about NAG (N-Acetyl Glucosamine)#
What is NAG (N-Acetyl Glucosamine)?
- A gentle amino sugar that helps dark spots and uneven patches look less noticeable, working a different way from most brightening ingredients.
What else is NAG (N-Acetyl Glucosamine) called?
- On a label you may see NAG, Glucosamine and Acetyl glucosamine.
When should you apply NAG (N-Acetyl Glucosamine)?
- Morning or evening.
How often can you use NAG (N-Acetyl Glucosamine)?
- Daily.
Where do you apply NAG (N-Acetyl Glucosamine)?
- All over the face. Keep it away from your eyes and lips.
Can you use NAG (N-Acetyl Glucosamine) around the eyes?
- Yes. NAG (N-Acetyl Glucosamine) goes all over the face, the skin around the eyes included — keep it out of your eyes and off your lips.
Does NAG (N-Acetyl Glucosamine) make skin more sensitive to the sun?
- No. NAG (N-Acetyl Glucosamine) is not flagged as increasing sun sensitivity.
What should you not use with NAG (N-Acetyl Glucosamine)?
- Nothing flagged. None of the ingredients this wiki covers needs to be kept apart from NAG (N-Acetyl Glucosamine) — check the label of anything not covered here.
Who should avoid NAG (N-Acetyl Glucosamine)?
- Go slowly with Fragile or Sensitive and Recent Facial or Laser.
Is there a cosmetic limit for NAG (N-Acetyl Glucosamine)?
- No. No cosmetic regulator in the United States, Canada, the European Union or Great Britain sets a maximum strength for it. That is a limit on the rules, not a signal to use more.
Related ingredients#
How we check this#
Everything on this page traces to the sources listed below — regulators' own publications and published studies. Where the evidence does not answer a question, it is left unanswered.
Some sources below are the official product information for prescription medicines, cited for how they interact with this ingredient. We use them for their safety and handling detail only. A cosmetic product is not one of those medicines and is not intended to treat any condition.
Our review is AI-assisted and is not a named expert's opinion. Last reviewed August 6, 2026.
Think something here is out of date or wrong? Email us at wiki@skinintelligence.ai with your reasoning and where you read it. We read what people send, and we update the page when the sources support it.
Regulators and official bodies · 8
- S1Expert Panel for Cosmetic Ingredient Safety. Safety Assessment of Glucosamine Ingredients as Used in Cosmetics — Final Report, released 6 July 2022, Panel meeting 16–17 June 2022. Cosmetic Ingredient Review.
- S2Cosmetic Ingredient Review. Safety Assessment of Glucosamine Ingredients as Used in Cosmetics — Draft Report for Panel Review, 10 November 2021 (Conclusion: "To be determined"). — superseded by S1; cited only where S1 omits a detail present in the draft.
- S321 CFR § 216.23(a)(4) — "N-acetyl-D-glucosamine (for topical use only)", bulk drug substances usable in compounding under FD&C Act § 503A. eCFR, Title 21 current as of 31 July 2026.
- S4Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (recast), consolidated text CELEX 02009R1223-20260501 (consolidated to 1 May 2026), including all Annexes.
- S5Regulation (EC) No 1223/2009 as it applies in Great Britain, Annex II and Annex III. legislation.gov.uk.
- S6Health Canada, Cosmetic Ingredient Hotlist — List of Prohibited and Restricted Cosmetic Ingredients..
- S7Roaccutane 10 mg soft capsules — Summary of Product Characteristics, §4.3 Contraindications, §4.4 Special warnings and precautions, §4.5 Interactions. Neon Healthcare Ltd, electronic medicines compendium.
- S8Differin Gel 0.1% w/w (adapalene) — Summary of Product Characteristics, §4.2, §4.4, §4.5. Electronic medicines compendium.
Studies and references · 19
- S9Bissett DL, Robinson LR, Raleigh PS, Miyamoto K, Hakozaki T, Li J, Kelm GR. Reduction in the appearance of facial hyperpigmentation by topical N-acetyl glucosamine. J Cosmet Dermatol. 2007;6(1):20–26. PMID 17348991.
- S10Kimball AB, Kaczvinsky JR, Li J, Robinson LR, Matts PJ, Berge CA, Miyamoto K, Bissett DL. Reduction in the appearance of facial hyperpigmentation after use of moisturizers with a combination of topical niacinamide and N-acetyl glucosamine: results of a randomized, double-blind, vehicle-controlled trial. Br J Dermatol. 2010;162(2):435–441. doi:10.1111/j.1365-2133.2009.09477.x. PMID 19845667.
- S11Bissett DL, Farmer T, McPhail S, Reichling T, Tiesman JP, Juhlin KD, Hurley GJ, Robinson MK. Genomic expression changes induced by topical N-acetyl glucosamine in skin equivalent cultures in vitro. J Cosmet Dermatol. 2007;6(4):232–238. PMID 18047607.
- S12Hwang JS, Lee HY, Lim TY, Kim MY, Yoon TJ. Disruption of tyrosinase glycosylation by N-acetylglucosamine and its depigmenting effects in guinea pig skin and in human skin. J Dermatol Sci. 2011;63(3):199–201. doi:10.1016/j.jdermsci.2011.06.002. PMID 21723097. — no abstract is indexed for this letter; its figures are quoted here from CIR's detailed summary of it at S1 ref 41.
- S13Mammone T, Gan D, Fthenakis C, Marenus K. The effect of N-acetyl-glucosamine on stratum corneum desquamation and water content in human skin. J Cosmet Sci. 2009;60(4):423–428. PMID 19691938.
- S14Sayo T, Sakai S, Inoue S. Synergistic effect of N-acetylglucosamine and retinoids on hyaluronan production in human keratinocytes. Skin Pharmacol Physiol. 2004;17(2):77–83. doi:10.1159/000076017. PMID 14976384. (Basic Research Laboratory, Kanebo Ltd, Odawara, Japan.).
- S15Tu CX, Zhang RX, Zhang XJ, Huang T. Exogenous N-acetylglucosamine increases hyaluronan production in cultured human dermal fibroblasts. Arch Dermatol Res. 2009;301(7):549–551. doi:10.1007/s00403-009-0932-z. PMID 19247681.
- S16Połubinska A, Cwalinski J, Baum E, Bręborowicz A. N-Acetylglucosamine modulates function of the skin fibroblasts. Int J Cosmet Sci. 2013;35(5):472–476. doi:10.1111/ics.12067. PMID 23672714.
- S17Villacis J, Rice TR, Bucci LR, El-Dahr JM, Wild L, Demerell D, Soteres D, Lehrer SB. Do shrimp-allergic individuals tolerate shrimp-derived glucosamine? Clin Exp Allergy. 2006;36(11):1457–1461. doi:10.1111/j.1365-2222.2006.02590.x. PMID 17083356. — oral route, glucosamine not NAG..
- S18Schlessinger J, Green B, Edison BL, Murphy L, Sabherwal Y. A Firming Neck Cream Containing N-Acetyl Glucosamine Significantly Improves Signs of Aging on the Challenging Neck and Décolletage. J Drugs Dermatol. 2016;15(1):47–52. PMID 26741381. (Green, Edison, Murphy and Sabherwal are stated in the paper as NeoStrata Company, Inc.).
- S19Bissett DL. Glucosamine: an ingredient with skin and other benefits. J Cosmet Dermatol. 2006;5(4):309–315. PMID 17716251. — narrative review, single author, manufacturer-affiliated.
- S20Callender VD, St Surin-Lord S, Davis EC, Maclin M. Postinflammatory hyperpigmentation: etiologic and therapeutic considerations. Am J Clin Dermatol. 2011;12(2):87–99. doi:10.2165/11536930-000000000-00000. PMID 21348540.
- S21Davis EC, Callender VD. Postinflammatory hyperpigmentation: a review of the epidemiology, clinical features, and treatment options in skin of color. J Clin Aesthet Dermatol. 2010;3(7):20–31. PMID 20725554, PMC2921758.
- S22Alexis AF, Blackcloud P. Natural ingredients for darker skin types: growing options for hyperpigmentation. J Drugs Dermatol. 2013;12(9 Suppl):s123–s127. PMID 24002160.
- S23Leyden JJ, Shergill B, Micali G, Downie J, Wallo W. Natural options for the management of hyperpigmentation. J Eur Acad Dermatol Venereol. 2011;25(10):1140–1145. doi:10.1111/j.1468-3083.2011.04130.x. PMID 21623927. (Carries the copyright line "© 2011 Johnson & Johnson Consumer Companies, Inc.").
- S24Wang ST, Neo BH, Betts RJ. Glycosaminoglycans: Sweet as Sugar Targets for Topical Skin Anti-Aging. Clin Cosmet Investig Dermatol. 2021;14:1227–1246. PMID 34548803, PMC8449875.
- S25Chen JK, Shen CR, Liu CL. N-Acetylglucosamine: Production and Applications. Mar Drugs. 2010;8(9):2493–2516. PMID 20948902, PMC2953398.
- S26Glucosamine. In: Drugs and Lactation Database (LactMed). Bethesda (MD): National Institute of Child Health and Human Development. NCBI Bookshelf NBK501868. — oral route.
- S27Sarkar R, Arora P, Garg KV. Cosmeceuticals for Hyperpigmentation: What is Available? J Cutan Aesthet Surg. 2013;6(1):4–11. PMID 23723597, PMC3663177.
