Before I get into the review, a little background info: I started experiencing hormonal acne shortly after my 21st birthday. When I finally went to a dermatologist for help, I was prescribed ...

This article originally appeared on Instyle. Maybe it’s just in your DNA, or maybe it’s caused by too much contact with the sweaty mats at the gym. Doesn’t really matter—body acne sucks either way.

This is different from AHAs alpha-hydroxy acids, which are only water-soluble and remain on the skin surface. It appears that niacinamide is especially effective at treating acne in people with oily ...