Melanotan II synthetic tanning drug molecule, illustration Stock Image F029 9531 Science Photo Library Melanotan Injection What does it do? Man warns against 'dangerous' tanning injections after turning so dark he 'looked like Madge from Benidorm' and now has the freckled skin of a 60 year old How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL Avoid nasal tanning sprays or nasal tanners entirely. These products promise an all over tan without sun exposure but they are unregulated, can be unsafe, and contain potentially risky substances like Melanotan 2.