TETRAPEPTIDE-42 is graded A (Safe) by Expert·ING, based on COSING regulatory data.
TETRAPEPTIDE-42
Safety grade: A
Tetrapeptide-42 is a small protein fragment made up of four amino acids linked together. It's a lab-created ingredient designed to help improve skin texture and appearance.
This ingredient is used in skincare products to condition and improve the overall feel and appearance of the skin by promoting smoother, more supple skin.
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