The Hidden Dangers of Tanning Nasal Sprays That You Should Be Aware Of Melanotan II A Sun Kissed Look, and a Confident You. Melanotan II Erectile Dysfunction: What the Evidence Shows and Practical Considerations 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.