Antioxidant

Tripeptide-51

INCI: TRIPEPTIDE-51

Reviewed by Rosie · Last updated 18 Aug 2026

What Is Tripeptide-51?

Tripeptide-51 is the synthetic peptide consisting of alanine, glycine, and hydroxyproline.

Its declared cosmetic functions are antimicrobial, antioxidant, astringent, humectant, skin conditioning and skin protecting.

Source: European Commission CosIng inventory.

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