When a cream or serum promises that it’s packed full of skin-loving vitamins and minerals, one of them is probably vitamin B3, also known as niacinamide or nicotinamide. While the active ingredient has been around for years, it’s gaining popularity thanks in part to, well, you—the internet skincare obsessive. Unlike its active ingredient counterparts retinol and vitamin c, niacinamide’s benefits can’t be easily wrapped up as a collagen booster or skin brightener—confusion around niacinamide’s skin benefits exists because it has so many of them. So we asked three expert dermatologists to tell us everything you need to know about it, including how to add B3 to your routine and their favorite creams and serums that contain the useful vitamin.