Arginine

AKA: L-Arginine

Synthetic

Fragrance

Skin Conditioner

Hair Care

Amino Acid

Not Clean

L-Arginine

CAS #

74-79-3 / 7200-25-1

Functions

ANTISTATIC

FRAGRANCE

Added for scent. Can be natural or synthetic. Common irritant and allergen — one of the top reasons people react to products.

HAIR CONDITIONING

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

SKIN CONDITIONING

A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory0 listings

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

CIR Safety Findings

Not a Skin Irritant

9 studies / 9 not irritating (CIR 607)

Not a Sensitizer

9 studies / 9 not sensitizing (CIR 607)

Mixed Eye Irritation Results

3 studies / 1 irritating / 2 not irritating / reactions weak (CIR 607)

Concentration Guide

Leave-on0.00002–2%

Rinse-off0.00004–18%

0%50%100%

CIR reported use · report published 2013

Verified Jun 2026

Data: CosIng