Melanotan is not a tan. It's an unregulated peptide with real risk. As a dermatologist, here's the reality: It has been linked to new and changing moles including cases of The Dangers of Melanot*n II Explained Melatonin News, Research and Analysis The Conversation page 1 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 Martina Big, 36, who is from Germany, and her husband Michael Eurwen, 38, who both injected Melanotan, a synthetic hormone to darken their skin have announced that they are planning to permanently