Tanning Injections: Risks, Side Effects, and Precautions Melanotan II (MT II) Peptide Therapy Beverly Hills How Long Does It Take For Melanotan To Work? Nasal Tanners Say "NO WAY" to the spray! UNAPPROVED, UNREGULATED, UNSAFE. Nasal tanning sprays, or nasal tanners, promise an all over tan without sun exposure. However, they are unregulated, can be 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 longer lasting than