Imagine just wanting to be jacked and tan and you end up like this? Melanotan II is a peptide that increases the melanin in your skin and can give men a boner that BBC News Latest News Picks, Toxic tanning "I didn't think I'd get skin cancer" You may have heard about the latest trend tanning nasal sprays and injections. So how does it work and is it safe? Refs: Fjellhaugen Hjuler et al., 2014, Melanoma associated with the use of Melanotan II nasal spray: a possible risk factor for oral mucosal malignant melanoma? International Journal of Oral and Maxillofacial Surgery 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