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 Imagine just wanting to be jacked and tan and you end up like this? Melanotan II is a peptide that increases the melanin in your skin and can give men a boner that Discover Melanotan 1 vs 2 Differences Peptide Works Melanotan 1 vs Melanotan 2: Differences, Benefits & Risks