When it comes to tanning peptides, there are two main options: Melanotan 1 and Melanotan 2. Melanotan 1, also called afamelanotide, is FDA approved for a rare light sensitivity condition and works Here's the part nobody explains when they're selling you the "Barbie drug.", , Melanotan 2 is a synthetic peptide that mimics alpha MSH a hormone your body already makes to tell your skin cells to Melanotan What It Is and Its Relation to Skin Cancer Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically Melanotan II PERMANENTLY Darkened My Skin!