It is a peptide, my wife was just about to purchase it through the clinic I go to. But upon further examination it can leave streaks splotches, and increase visibility of freckles. They told her that it would be wise to start low dose to c where or if any of these things happen so she could stop early on as the effects will last a few months. Also like most supplements it works best when tanning or being out in the sun more. So it wont tan if you are constantly indoors.hope this helps