Melanotan 2 (MT-II) is an analog of alpha-melanocyte stimulating hormone (a-MSH) that induces skin tanning. Melanotan 2 comes in the form of a freeze dried (lyophilized) peptide. Melanotan 2 acts on melanocytes to stimulate melanin production. Melanin is the pigment responsible for tanning. Melanotan 2 has a protective cyclic amino acid structure as compared to a linear peptide M-I. MT-II out competes a-MSH for binding to melanocyte receptors over 1000x. Melanotan II has the additional effect of increasing libido and has also exhibited the potential to decrease body fat mass and reduce food intake. Buy 10MG MT-II (Melanotan 2) Peptide at Tan Research.