tga don t risk using tanning products containing melanotan II, also known as 'The Barbie Drug,' is an unregulated substance with serious reported side effects that is not safe for consumer use. The bottom line: Melanotan II has serious health Nasal tanning sprays warning issued
Description
By giving smaller amounts, the digestive system can absorb a higher percentage of the supplement into the bloodstream [15]

Aronis KN, Zhao D, Hoogeveen RC, Alonso A, Ballantyne CM, Guallar E, et al

On the other hand, MC3R and MC4R have been studied for their roles in appetite regulation, metabolism, and sexual behavior in experimental models
Collagen and Vitamin C As mentioned, Vitamin C is the "on switch" for collagen production

These are not FDA approved medications