Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? While a whiter smile seems to be the primary benefit being peddled on social ...

Niacinamide (pronounced nahy-uh-sin-uh-mayhd) is popping up more and more in the skin care world. But like a lot of scientific-sounding ingredients, it’s not obvious where niacinamide comes from or ...