It is a naturally occurring copper-binding tripeptide that was first identified in human plasma
These observations led to an interesting development bifurcation : Melanotan I (Afamelanotide) continued as a skin peptide and in 2014 received approval as Scenesse for erythropoietic protoporphyria (a rare genetic disease with severe photosensitivity) Melanotan II was abandoned as a cutaneous drug PT-141 / Bremelanotide , a fragment of Melanotan II targeted at MC4R, was developed as a sexual stimulant and in 2019 approved as Vyleesi for hypoactive sexual desire disorder in women (HSDD) Second life in research and the cosmetic underground Melanotan II never reached commercial approval as a drug, but in the research community and cosmetic underground it became well known
I wouldn't recommend it for everyone
But even then, the injection site makes a difference
Chen S, Wang X, Sun D, Zhang S, Liu P, Xu X, et al
Storage Store in a cool, dry place away from direct sunlight