The Hidden Dangers of Tanning Nasal Sprays That You Should Be Aware Of Consumers warned to avoid 'dangerous' nasal tanning sprays and gummies The Independent 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 Thinking about that tanning nasal spray? Don't. Unregulated nasal tanning sprays are being sold online, claiming to give you a sun kissed glow. But they're risky and illegal. According to the Chartered Trading