Melanotan II (Tan Jabs): Why They're Not Worth The Risk That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin 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 Why I Refuse to Use Salmon Sperm & Melanotan II in My Practice