TETRAPEPTIDE-21 is graded A (Safe) by Expert·ING, based on COSING, FDA regulatory data.
TETRAPEPTIDE-21
Safety grade: A
Tetrapeptide-21 is a small protein fragment made up of four amino acids linked together. It's designed to help improve skin's texture and firmness by supporting the skin's natural structure.
This ingredient conditions the skin by helping to strengthen and maintain skin elasticity, promoting a smoother and more resilient complexion.
Graded using: COSING, FDA.
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