Arginine

Also known as: L-Arginine

INCI: Arginine | Function: Conditioning, pH Adjuster, Healing | Type: Humectant

What Is Arginine?

Arginine is a semi-essential amino acid that serves multiple functions in skincare: it is a Natural Moisturizing Factor (NMF) component, a precursor to nitric oxide (vasodilation for improved circulation), and a substrate for urea production in skin. Arginine accelerates wound healing, improves skin hydration, and is often used to formulate high-pH products like peptide serums (buffering capacity). Also beneficial for hair care as a conditioning amino acid.

Key Skin Benefits

+ NMF component — natural skin hydration
+ Nitric oxide precursor — improves microcirculation
+ Accelerates wound healing
+ Buffering agent for pH-sensitive formulations
+ Hair conditioning amino acid

Pros

+ + Natural skin component (NMF)
+ + Multi-functional — hydration + healing + pH
+ + Well-tolerated at all concentrations
+ + Affordable amino acid
+ + Useful for hair and skin

Cons

− − Can raise product pH — formulation challenge
− − Not a standout anti-aging ingredient
− − Heat-sensitive — degrades in high-temperature processing

Specifications

Property	Value
Usage Areas	Face, Eye, Body, Hair
Product Type	Leave-On, Rinse-Off
Source	Synthetic / Fermentation
Natural Level	Natural-derived

Safety Ratings

Metric	Rating
Skin Sensitivity	1/5
Comedogenic Rating	0/5
EWG Score	1/10

Regional Regulatory Limits

Region	Leave-on %	Rinse-off %	Status
EU (CosIng)	No limit	No limit	Allowed
US (CIR/FDA)	No limit	No limit	Allowed
Japan (MHLW)	No limit	No limit	Allowed
ASEAN	No limit	No limit	Allowed
China (NMPA)	No limit	No limit	Allowed

Typical Usage % by Product Type

Product Type	Typical %
Serum	0.1 - 2%
Moisturizer	0.1 - 1%
Hair Conditioner	0.5 - 3%

References

Witte MB, Barbul A — Arginine in wound healing. Wound Repair Regen (2003). PMID: 14632296
Rawlings AV et al. — NMF components in skin. J Invest Dermatol (1994)
Goldman R — Arginine and nitric oxide. Biotechnol Ther (1995)

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