5 days progress. I've been taking 250mcg of Melanotan II and tanning for 10m outside daily. It's working Tighter in the hamstrings, glutes are still holding all of my fat so 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 II (MT II) Peptide Therapy Beverly Hills Melanotan II Erectile Dysfunction Studies: What Early Research Shows and Practical Realities Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn