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 reverses memory impairment induced by a short term HF diet ScienceDirect Eruptive naevi and darkening of preexisting naevi 24 h after a single mono dose injection of melanotan II Semantic Scholar Warning issued over increased use of 'Barbie drug' Is this injectable tanning drug safe to use?