We’re always happy to geek out over a buzzy skin care ingredient when we see it making the rounds on product labels. (See: lactic acid, rosehip oil, bakuchiol…) So when we started noticing the proliferation of niacinamide, we were surprised to learn that not only has it been around for a while but there’s a decent body of research behind the multipurpose vitamin. Here’s what you need to know about niacinamide’s benefits for your skin.