HPRA Warns of Dangerous Melanotan 2 in Tanning Products Obelis Group Health expert says Melanotan II darkens skin moles and can make melanoma hard to detect Herald Sun Could users of new drug be dying for a killer tan? thv11.com 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.