ACETYL SH-TETRAPEPTIDE-39 is graded A (Safe) by Expert·ING, based on COSING regulatory data.
ACETYL SH-TETRAPEPTIDE-39
Safety grade: A
This is a small protein fragment created in a laboratory that is designed to improve skin texture and appearance. It works by signaling skin cells to function more efficiently and maintain a healthy, smooth surface.
This ingredient conditions and improves the overall quality of skin by promoting a smoother, more refined appearance and supporting the skin's natural barrier function.
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