Melanotan 2: Day 6 , Another one hour in what minimal sun we had today. , No tanning beds, just sun. , Moved down to 50mcg before sun exposure, No more side effects :) , Before & before , Well see Melanotan II Erectile Dysfunction: What the Evidence Shows and Practical Considerations 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 FDA Fast Facts