Melanotan 2 tanning injections Day 2 on MT2 and Already Regretting It A Dermatologist Reacts YouTube Melanotan II (Tan Jabs): Why They're Not Worth The Risk Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and longer lasting than Melanotan 2: The Path to a Bronze Tan, a Leaner Physique, and Enhanced Libido PARTICLE, s. r. o.