Emerging Threat: Melanotan, Repackaging, and Online Sales Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian BodyTech, L Carnitine 3000, Peach Mango , 24 fl oz (709 ml) Nasal tanners claim to work by using Melanotan II, a chemical that darkens skin pigmentation. It is illegal to sell medicinal products containing Melanotan II in the UK but since the tanners are sold Melanotan 2 is an unregulated, unsafe substance often advertised as a self tanning aid., Use of Melanotan 2 has been linked to serious side effects including loss of vision, moles, stroke, muscle