Peptides for tanning do exist. Melanotan 1 and Melanotan 2 both work at increasing melanin in the skin. Melanotan 1 takes longer to activate. Melnotan 1 is FDA approved. Melanotan 2 does libido, Source Naturals L Carnitine Capsules 250mg, 120 ct Smith's Food and Drug Melanotan What It Is and Its Relation to Skin Cancer Dr Peptides Melanotan ll (mt2) 10mg Research Peptide (For Laboratory Use Only) Dr Peptides