Melanotan II (Tan Jabs): Why They're Not Worth The Risk Lets look at sunless tanning, ., Firstly theres the injections and nasal sprays which typically have an active ingredient called melanotan. This is a synthetic compound that stimulates the Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian The Hidden Dangers of Tanning Nasal Sprays That You Should Be Aware Of Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report