How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL Melanotan 1 vs. 2: My Summer Journey & Real Results Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun 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.