Ingredient Guide
Arginine
Also known as: Arginine, L-Arginine, L-Arginine HCl
All skin types
What It Is
An amino acid naturally found in skin as part of the Natural Moisturizing Factor (NMF). Used in skincare as a humectant, pH adjuster, and hair/skin conditioning agent.
What It Does
Attracts moisture to the skin as part of the NMF amino acid complex. In some formulas also acts as a pH adjuster (slightly alkaline).
Best For
NMF hydration supportHair conditioning
Benefits
- Skin-identical — part of the NMF amino acid system
- Humectant that supports moisture retention
- In hair products: helps smooth the hair cuticle
When to Be Careful
- No notable concerns at typical cosmetic concentrations
Commonly Found In
NMF moisturizersExfoliating tonersHair serumsScalp treatments
FAQs About Arginine
What does arginine do in skincare?
As one of the amino acids in skin's Natural Moisturizing Factor, arginine helps attract and retain moisture. In some formulas it also adjusts pH due to its basic nature.