CYSTEIC ACID is graded A (Safe) by Expert·ING, based on COSING regulatory data.
CYSTEIC ACID
Safety grade: A
Cysteic acid is an amino acid derivative that helps strengthen and protect the skin's outer layer. It's formed naturally in the body as part of normal protein metabolism.
This ingredient conditions and protects the skin by supporting its natural barrier function and helping to maintain skin hydration and elasticity.
Graded using: COSING.
Last verified: May 26, 2026
Other Skin Conditioning ingredients
- TOCOPHEROL — Grade A
- PROPYLENE GLYCOL — Grade A**
- XANTHAN GUM — Grade A
- DIMETHICONE — Grade A
- TOCOPHERYL ACETATE — Grade A
- PANTHENOL — Grade A
- CAPRYLYL GLYCOL — Grade A
- ETHYLHEXYLGLYCERIN — Grade A