N-Acetyl Glucosamine, NAG（CAS 7512-17-6）

N-Acetyl Glucosamine, NAG（CAS 7512-17-6）

N-Acetyl Glucosamine (NAG), also known as Acetyl Glucosamine or GlcNAc, is a naturally occurring amino sugar that is a fundamental building block of glycosaminoglycans (GAGs) like hyaluronic acid and chondroitin sulfate in the skin. As a skin-identical ingredient naturally present in the extracellular matrix, NAG plays a crucial role in maintaining skin hydration, structure, and barrier function. In skincare, NAG is a multifunctional active with multiple proven benefits: it serves as a direct precursor for hyaluronic acid biosynthesis, stimulating the skin to produce more of its own HA for deep, long-lasting hydration; it promotes collagen synthesis and inhibits matrix metalloproteinases that break down collagen, improving skin elasticity and reducing fine lines; it inhibits tyrosinase activity to reduce melanin production, effectively lightening hyperpigmentation and evening skin tone; and it provides gentle keratolytic exfoliation similar to AHAs but with significantly less irritation, making it suitable for sensitive skin.

Key Benefits

• Boosts hyaluronic acid synthesis, direct precursor for HA biosynthesis, deep long-lasting hydration

• Stimulates collagen production, improves skin elasticity, reduces fine lines and wrinkles

• Skin brightening & depigmenting effect, inhibits tyrosinase, reduces melanin production

• Gentle exfoliation (keratolytic), AHA-like results without irritation, suitable for sensitive skin

• Enhances skin barrier function, reduces transepidermal water loss (TEWL)

• Synergistic with niacinamide, combined use significantly enhances brightening efficacy

• Natural skin-identical ingredient, excellent biocompatibility, gentle and safe

• Antioxidant protection, inhibits matrix metalloproteinases that degrade collagen

Applications

• Hydrating serums, creams & lotions: Recommended dosage 1%–5%

• Brightening & depigmenting serums, spot-correcting creams: Recommended dosage 2%–5%

• Anti-aging serums, anti-wrinkle creams: Recommended dosage 2%–5%

• Sensitive skin repair products, barrier repair creams: Recommended dosage 1%–3%

• Exfoliating products, peeling serums: Recommended dosage 2%–5%

• Post-sun repair products, soothing masks: Recommended dosage 1%–3%

• Toners, essences & lotions: Recommended dosage 0.5%–3%

• Facial masks (sheet masks, wash-off masks): Recommended dosage 1%–4%

• Body lotions & moisturizers: Recommended dosage 1%–3%

• Eye care products (eye creams, eye serums): Recommended dosage 0.5%–2%

Certificate Of Analysis (COA)

Frequently Asked Questions (FAQ) & Document Request Frequently Asked Questions (FAQ) & Document Request

Q1: How effective is NAG for skin brightening compared to niacinamide and tranexamic acid?

A: NAG does have demonstrated brightening efficacy — it inhibits tyrosinase glycosylation and activation, reducing melanin production. In clinical studies, 2% NAG has been shown to significantly reduce hyperpigmentation after 8 weeks of use. However, its brightening potency is generally considered moderate compared to dedicated brightening actives. Niacinamide (Vitamin B3) is a well-studied brightening ingredient that works by inhibiting melanosome transfer from melanocytes to keratinocytes, with strong clinical evidence for improving uneven skin tone and reducing hyperpigmentation. Tranexamic Acid is a potent anti-pigmentation ingredient that works by inhibiting plasmin and reducing melanocyte activation, particularly effective for melasma and post-inflammatory hyperpigmentation. The exciting news is that NAG works synergistically with niacinamide — studies have shown that combining NAG with niacinamide produces significantly better brightening results than either ingredient alone, because they work through different mechanisms (NAG inhibits tyrosinase activation, niacinamide inhibits melanosome transfer). This is why many premium brightening formulations combine both NAG and niacinamide for a multi-pathway approach to pigmentation control.

Q2: How does NAG's exfoliating effect compare to AHAs like glycolic acid? Is it really gentler?

A: NAG does have keratolytic (exfoliating) properties, but it works through a different mechanism than AHAs and is significantly gentler. AHAs like glycolic acid and lactic acid work by dissolving the desmosomal "glue" that holds dead skin cells together, providing relatively aggressive exfoliation but also higher potential for irritation, redness, and sensitivity, especially at higher concentrations. NAG works by hydrating and softening keratin in the stratum corneum, gently weakening the cohesion between dead skin cells to promote natural shedding. This is a much milder form of exfoliation. Key differences: 1) Irritation potential — NAG has minimal to no irritation potential, even at higher concentrations, making it suitable for sensitive skin that cannot tolerate AHAs; 2) pH requirement — AHAs need low pH (around 3-4) to work effectively, which can be irritating, while NAG works at neutral pH; 3) Additional benefits — NAG simultaneously provides moisturizing, barrier repair, and anti-aging benefits, whereas AHAs can be drying and may compromise barrier function with overuse; 4) Exfoliation strength — AHAs provide stronger, faster exfoliation, while NAG provides milder, more gradual exfoliation. NAG is an excellent choice for gentle exfoliation in sensitive skin formulations, or for daily use exfoliation without the risk of over-exfoliation.

Q3: How should NAG be added in formulation? Are there any contraindications or special considerations?

A: NAG is water-soluble and relatively easy to formulate with. It is typically added to the water phase and can be dissolved at room temperature or with gentle heating. Key considerations: 1) pH compatibility — NAG is most stable in the pH range of 4.0–8.0, which covers most cosmetic products; it may degrade more rapidly at very high pH (above 9); 2) It is compatible with most cosmetic ingredients including other humectants, emulsifiers, preservatives, and active ingredients; 3) Synergistic combinations — NAG works particularly well with niacinamide (synergistic brightening), hyaluronic acid (enhanced hydration), peptides (enhanced anti-aging), and centella asiatica extract (enhanced soothing and repair); 4) Heat stability — NAG is relatively heat-stable and can withstand typical formulation temperatures, though prolonged high-temperature processing should be minimized; 5) Discoloration risk — in formulations containing reducing sugars or certain proteins, NAG may participate in Maillard browning reactions over time, especially at elevated temperatures; 6) Since NAG is a powder, ensure complete dissolution to avoid gritty texture. There are no major known contraindications, and NAG is generally considered a very safe and compatible cosmetic ingredient with excellent tolerability.

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