Dangerous' tanning products promoted by influencers 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 longer lasting than Melanotan What It Is and Its Relation to Skin Cancer Amazon.com: Radiant Chemistry : Unveiling the secrets of Melanotan II and it's Effects on Desire eBook : James, Nicolas : Kindle Store 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.