Niacinamide (also known as vitamin B3) can have several benefits for the skin, especially for those with oily skin. Niacinamide face serum can help regulate sebum production and reduce excess skin oil, while also helping to reduce the appearance of redness and improve skin clarity. Niacinamide supports a healthy skin moisture barrier to promote a hydrated and plumped complexion. The Kiehl's Ultra Pure High-Potency 5% Niacinamide Serum is minimally formulated to help visibly reduce the appearance of oil and shine for balanced, even and healthy-looking skin.