Niacinamide is EVERYWHERE in the skincare world, but for good reasons. It’s a jack-of-all-trades type of molecule that has actual clinical evidence that ranges from improving skin barrier function, reducing sebum production, to brightening hyperpigmentation. But in recent years products now have way more niacinamide than ever before. So let's review some of niacinamide’s most famous clinical tests and answer the question “is there such thing as too much niacinamide?”