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 Melanocytic Proliferations and Other Pigmented Lesions Plastic Surgery KeyPlastic Surgery Key Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically 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 Immunohistochemistry in melanocytic lesions: Updates with a practical review for pathologists ScienceDirect