Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Bartletts back. The time he using psychological manipulation to sell dangerous, untested peptides like melanotanan illegal drug known to cause cancer. , I explain the rebellious reframe tactic he Melanotan II (Tan Jabs): Why They're Not Worth The Risk Melanotan is not a tan. It's an unregulated peptide with real risk. As a dermatologist, here's the reality: It has been linked to new and changing moles including cases of 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.