Tanning peptides like melanotan are trending online, but they're not approved, not regulated, and illegal to advertise in Australia. When products haven't been properly tested, there's no way to know what's actually Australia should stop beefing up its steroid laws that won't help users 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 How Long Does It Take For Melanotan To Work?