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 October 2017 VOL. 14, ED 3. by PeningtonInstitute Issuu Melanotan 2: Day 6 , Another one hour in what minimal sun we had today. , No tanning beds, just sun. , Moved down to 50mcg before sun exposure, No more side effects :) , Before & before , Well see I accidentally undid years of skin work and didnt realize it until it was too late., At the beginning of November, I started taking melanotan 2 and honestly?, I loved it., My tan deepened