Melanotan

Melanotan II is an analog that is a derivative of a precursor of melanocyte stimulating hormone (a-MSH). It seeks out melanocortin receptors, primarily MC1R in the skin and MC4R in the brain. On the skin side, it ramps up tyrosinase within melanocytes, cranks out eumelanin and revs up the handoff of that pigment to nearby keratinocytes. Translation: You tan with less sun and the color lasts longer. Melanocortin tone can also affect libido and appetite, so users may find themselves feeling extra lusty and a little less hungry. The molecule is 'cyclic' and very receptor efficient, so small amounts can give clear effects.