Dangerous' tanning products promoted by influencers Peptides are having a moment, but not all of them are harmless., One thats getting a lot of attention right now? Melanotan II., Its being used to achieve a tan from the inside, but what it 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 Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report Tanning Injections: Risks, Side Effects, and Precautions