Active ingredient
Tetrapeptide
INCI · Tetrapeptide-21
Tetrapeptide-21 is a four-amino-acid peptide (sequence GEKG) used in age-care formulas to support the look of firmness and elasticity. It is valued for helping the skin appear smoother and more even over continued use.
Mechanism in detail
What Tetrapeptide does
This peptide helps support the appearance of the skin's structural network, reinforcing a firmer, smoother look.