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 Dangerous 'Barbie drug' Melanotan II sparks crackdown on social media influencers ABC News 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 Melanocortin agonism in a social context selectively activates nucleus accumbens in an oxytocin dependent manner ScienceDirect