Dangerous' tanning products promoted by influencers Obesity due to MC4R deficiency is associated with reduced cholesterol, triglycerides and cardiovascular disease risk Nature Medicine 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 Age related ciliopathy: Obesogenic shortening of melanocortin 4 receptor bearing neuronal primary cilia ScienceDirect The Dark Side of Melanotan Tanning Injections: My Personal Experience Revealed