Decapeptide-12 is an oligopeptide with proposed anti-tyrosinase activity, composed of twelve amino acids and exhibiting the sequence Try-Arg-Ser-Aar-Lysd-Tyr-Ser-Ser-Trp-Tyr. It is thought to function primarily to restrain Tyrosinase—the enzyme researchers believe is responsible for the excessive production of melanin, which may result in patchy pigmentation upon the epidermal layer’s surface.[1]