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 Changes in Oral Mucosa Associated with Melanotan II Injections: A Case Report Nasal tanning sprays linked to skin cancer, trading standards officers warn Consumer affairs The Guardian Melanotan II (Tan Jabs): Why They're Not Worth The Risk