What It Is: A concentrated 5% Niacinamide serum for oily skin made with only 10 ingredients that visibly reduces the appearance of excess oil, redness, and shine. Features and Benefits: Formulated to help visibly minimize shine and soothe skin Minimally formulated for skin absorption and efficacy Reduces the appearance of excess oil on skin Visibly reduces redness Limit the appearance of imperfections including acne, post-acne marks, and redness Ideal for oily skin types, suitable for all skin types, including sensitive Free of fragrance and colorants Key Ingredient: Niacinamide, the form of Vitamin B3 used within Kiehl's formulas, is known to help visibly brighten skin. When used in topical skincare formulas, Niacinamide can also help balance skin's surface oil. How to Use: Apply 2-3 drops to clean, dry skin in the morning and evening Try out Kiehl's Niacinamide Serum skin hacks below: Zone treat your face by applying Niacinamide Serum to areas prone to oiliness and breakouts. Follow with your favorite moisturizer where needed. Layer with Kiehl's Hyaluronic Acid Serum to hydrate & rebalance skin's moisture. Layer with Kiehl's Glycolic Acid Serum to gently exfoliate & improve texture. Ingredients: Aqua/Water, Niacinamide, Glycerin, Propanediol, Methyl Gluceth-20, Hydroxyacetophenone, Sodium Hyaluronate, Caprylyl Glycol, Carbomer, Sodium Hydroxide