Carnosine is a dipeptide that is the N-(beta-alanyl) derivative of L-histidine. It has a role as an anticonvulsant, an antioxidant, an antineoplastic agent, a human metabolite, a Daphnia magna metabolite and a mouse metabolite. It is a conjugate acid of a carnosinate. It is a tautomer of a carnosine zwitterion.