Avoid nasal tanning sprays or nasal tanners entirely. These products can produce nasty side effects, such as nausea and vomiting, high blood pressure, respiratory issues, and even links to skin cancer. Nasal No, you don't need the 'Barbie drug' to tan, whatever TikTok says. Here's why melanotan II is so risky Melanotan II is a synthetic peptide that mimics the bodys natural melanocortin hormones, primarily activating receptors involved in skin pigmentation, appetite, and central nervous system signaling. Melanotan II A Sun Kissed Look, and a Confident You.