Tetrapeptide-21  is a lab-engineered peptide composed of four amino acids that functions as a skin-conditioning and anti-aging ingredient. It is designed to mimic natural biological signals in the skin, helping to stimulate the production of structural proteins such as collagen.
This peptide works by communicating with skin cells (particularly fibroblasts), encouraging them to regenerate and strengthen the skin’s extracellular matrix. As a result, it helps improve skin firmness, elasticity, and overall texture. Over time, Tetrapeptide-21 can reduce the appearance of fine lines and wrinkles while promoting smoother, healthier-looking skin.
 
Applications: Used in anti-aging skincare formulations such as serums, creams, lotions, and eye treatments to improve skin firmness, elasticity, and reduce wrinkles.
Appearance:  White to off-white powder
Solubility:  Water-soluble
pH Range:  Typically stable in formulations with pH 4.0 – 7.0
Chemical Formula: C₁₇H₃₁N₅O₇
Cas. No: 960531-53-7