Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically Melanotan 2 Complete Guide and Safety Information Peptides for tanning do exist. Melanotan 1 and Melanotan 2 both work at increasing melanin in the skin. Melanotan 1 takes longer to activate. Melnotan 1 is FDA approved. Melanotan 2 does libido, There are two peptides people talk about for tanning: Melanotan 1 and Melanotan 2. Melanotan 1 works slower and mainly targets the skin, leading to a more gradual and even increase in pigment with Melanotan II Skin Pigmentation & Libido Understanding Injection Tan and Melanotan 2