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? Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn 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 Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian Nasal tanning sprays linked to cancer sold online what are they and are they legal? ITV News