Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report 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 Australia's Therapeutic Goods Administration is urging consumers to not use tanning products containing a synthetic peptide called 'Melanotan'. The drug can cause serious side affects, such a kidney failure, chest pains, acne, Melanotan is trending again. As a dermatologist, I strongly need to tell you It's an unapproved injectable peptide, and we're seeing: nausea and flushing darkening of existing moles