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. How long does Melanotan Nasal Spray Take to Work? You Should Avoid Using Nasal Tanning Sprays Using a Nasal Tanning Spray Scarred Me for Life This Morning Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and