Ingredient glossary
N-Acetyl Glucosamine
On your shelf ✓What N-Acetyl Glucosamine does for your skin, who it suits, and what to watch for.
INCI: N-Acetyl Glucosamine · Also: NAG
In short: N-Acetyl Glucosamine delivers brightening and barrier support, suits dry and sensitive skin best, and the evidence behind it is strong.
- What it does
- Brightening, barrier support
- Best for
- Dry, Sensitive skin
- Evidence
- Strong
- How long
- 4–8 weeks
The molecule
The Glow take
One of the ingredients I trust most.
When your goal is fading dark spots and evening out tone, N-Acetyl Glucosamine delivers, and the research properly backs it up. It tends to suit dry skin best.
— Maya
What it does
- brightening
- barrier support
- hydration
strong evidenceDouble blind split face and full face trials using two percent NAG alone or with four percent niacinamide show significant reductions in hyperpigmented spot area and more even melanin distribution with added hydration and fine line improvement.
On a label: usually effective at 2%.
Who it's for, and who should skip it
Tends to suit
- pigmentation
- postinflammatory hyperpigmentation
- photoaged
- dry
- sensitive
Approach with care
No specific group flagged to avoid it.
- Clogs poresLow
- Irritation riskLow
How it fits each skin type
- DrySuits
- CombinationNeutral
- OilyNeutral
- SensitiveSuits
Often chosen for pigmentation, postinflammatory hyperpigmentation, photoaged.
Where it fits in your routine
Give it four to eight weeks, and possibly less: that is simply when it was measured.
What was measured, and in whom
Measured on: Facial hyperpigmented spot area / appearance of hyperpigmentation, image analysis.
The trial for NAG alone is an 8-week, double-blind, placebo-controlled, left-right randomised split-face study of 2% NAG reporting reduced appearance of facial hyperpigmentation; 8 weeks is the last visit and the paper reports no interim timepoint, effect size or sample size, so this is a ceiling rather than a demonstrated onset. The combination trial is larger and properly vehicle-controlled - 4% niacinamide + 2% NAG against vehicle in 202 women aged 40-60 over 10 weeks, with images captured at 0, 4, 6 and 8 weeks - and brackets the window at 8 weeks or sooner, but it cannot separate NAG from niacinamide. Both are Procter & Gamble studies of the company's own formulations; 2% matches the concentration sold.
PMID:17348991 (Bissett et al., J Cosmet Dermatol 2007;6(1):20-6, 'Reduction in the appearance of facial hyperpigmentation by topical N-acetyl glucosamine'; 8-week double-blind placebo-controlled split-face). PMID:19845667 (Kimball et al., Br J Dermatol 2010;162(2):435-41, niacinamide + NAG, 10-week vehicle-controlled, n=202). Both titles and abstracts read against the claim.
Plays well with
- niacinamide
- vitamin c
- ceramides
N-Acetyl Glucosamine, answered
Is N-Acetyl Glucosamine safe during pregnancy?
Yes. N-Acetyl Glucosamine is considered safe to use during pregnancy and breastfeeding. As with anything, if you are unsure it is worth a quick word with your doctor or midwife.
Who should avoid N-Acetyl Glucosamine?
No specific group is flagged to avoid N-Acetyl Glucosamine. It is well tolerated by most skin. Still, introduce anything new one product at a time.
What concentration of N-Acetyl Glucosamine actually works?
N-Acetyl Glucosamine tends to be effective at around 2%. Much lower and it is likely underdosed.
Compare N-Acetyl Glucosamine with
- Niacinamide
- Vitamin C (LAA)
- Retinal
- Hydroxypinacolone Retinoate
- Retinyl Retinoate
- Azelaic Acid
- Tranexamic Acid
- Kojic Acid
- Phytic Acid
- THD Ascorbate
- Sodium Ascorbyl Phosphate
- Magnesium Ascorbyl Phosphate
- Ascorbyl Glucoside
- Ethyl Ascorbic Acid
- Bakuchiol
- PDRN
- Alpha Arbutin
- Hydroquinone
- Galactomyces Ferment Filtrate
- Rice Extract
- Thiamidol
- Cysteamine
- Tetrahydrocurcumin
- Phytosphingosine
- Exosomes
- Epidermal Growth Factor
- Colostrum
- Carnosine
- 4-n-Butylresorcinol
- 4-Hexylresorcinol
Can you mix N-Acetyl Glucosamine with
This, for every label you own
One ingredient is easy. A full label is where it gets confusing. The Ingredient Decoder reads any product and tells you the honest truth, ingredient by ingredient.