Arginine is a basic amino acid used in skincare primarily as a pH buffer/neutralizer and humectant-like conditioning agent that supports skin hydration and barrier function. It is generally well tolerated and often paired with acidic ingredients to balance formulation pH.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient stinging or irritation | Rare | More likely on compromised or sensitive skin, usually transient |
Contact allergy / allergic dermatitis | Very rare | Isolated sensitization reports; uncommon for amino acids |
Redness or itching | Rare | Generally mild and resolves on discontinuation |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.