How Melanotan Peptides Work to Enhance Skin Tone and Promote Tanning Age Well ATL Melanotan II A Sun Kissed Look, and a Confident You. Tan with Bronze Up Nasal Spray for Flawless Results 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.