The 'Barbie' Tanning Dr*g That Could K*LL You When Beauty Turns Ugly Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically Melanotan is trending again. As a dermatologist, I strongly need to tell you , Its an unapproved injectable peptide, and were seeing:, nausea and flushing, darkening of existing moles, Understanding Injection Tan and Melanotan 2 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 Rise in use of 'dangerous' tanning injection Channel 4 News