Melanotan Injection What does it do? It doesn't take much to fall down the Barbie Drug rabbit hole. In self tanner subreddits and on TikTok Shop, the tanning injectionaka Melanotan IIis marketed as a self tanner alternative that works by 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 Amazon.com: Tanning Spray,Tanning Nasal Spray,tanning Sunless sprays,Deep Tanning Dry spray,Sunless tanning Mist,Self Tanning Facial Mist,Natural Looking Tan (1PCS) : Beauty & Personal Care