Melanotan II A Sun Kissed Look, and a Confident You. The 'Barbie' Tanning Dr*g That Could K*LL You When Beauty Turns Ugly Illegal tanning nasal spray not a 'harmless alternative' to sunbaking, says TGA ABC News 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 White model Martina Big, who now a ''black' after taking tanning injections, announces plans to move to Africa.