Melanotan and Melanotan-II are both analogs of the peptide hormone alpha melanocyte stimulating hormone （?-MSH） that tend to induce skin tanning. Unlike Melanotan， Melanotan-II has the additional effect of increasing libido. Melanotan II has aphrodisiac properties.
The molecular formula is C50H69N15O9. It has the amino acid sequence of Ac-Nle-cyclo [Asp-His-D-Phe-Arg-Trp-Lys]-NH2 and a molecular weight of 1024.2 Dalton. The CAS Number is 121062-08-6.
Lyophilized Melanotan-II although stable at room temperature for 3 weeks， should be stored desiccated below -18℃. Upon reconstitution MT-II should be stored at 4℃ between 2-7 days and for future use below -18℃.
For long term storage it is recommended to add a carrier protein （0.1% HSA or BSA）.
Please prevent freeze-thaw cycles.