You Should Avoid Using Nasal Tanning Sprays 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 Melanotan What It Is and Its Relation to Skin Cancer The Peptide Craze Ground Truths Insights into Tanning Biology and Tanning Products JCAD The Journal of Clinical and Aesthetic Dermatology