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 Imagine just wanting to be jacked and tan and you end up like this? Melanotan II is a peptide that increases the melanin in your skin and can give men a boner that TikTokers using genetic disorder drug for the side effects of tanning, weight loss Doctors Say "Barbie Drug" Melanotan II Can Cause Brain Swelling Avoid nasal tanning sprays or nasal tanners entirely. These products can produce nasty side effects, such as nausea and vomiting, high blood pressure, respiratory issues, and even links to skin cancer. Nasal Synaptic changes induced by melanocortin signalling Nature Reviews Neuroscience