Niacinamide (vitamin B3) is a popular active ingredient and antioxidant in topical skincare products. Niacinamide serums tend to contain higher concentrations than other products and are usually targeted toward specific skincare concerns such as brightening, hydrating, and anti-aging. As an antioxidant, Niacinamide helps support healthy skin in a variety of ways. It soothes skin, reduces inflammation, and increases hydration and is also known for its ability to brighten dark spots and reduce hyperpigmentation. While it is well tolerated in most skin types, it is more commonly used to treat oily, combination, and acne-prone skin. This is because Niacinamide regulates oil production and reduces the appearance of enlarged pores