Description: Tetrapeptide-21, a bioactive peptide with anti-wrinkle and skin hyperpigmentation-reducing effects, is commonly used as a cosmetic ingredient [1]. Smiles: [C@@H](NC([C@@H](NC(CN)=O)CCC(O)=O)=O)(C(NCC(O)=O)=O)CCCCN

Cosmetic peptides are degraded small-molecule collagen proteins, typically composed of amino acid groups or residues ranging from 2 to 10 amino acids, linked in a specific sequence by peptide bonds. Due to their ability to stimulate collagen synthesis, aid wound healing, smooth wrinkles, and possess antioxidant,...