Kiehl's Since 1851 Ultra Pure High-Potency Serum 5.0% Niacinamide

What it is: An ultra-pure niacinamide serum that is formulated to reduce oil and shine.

Who it's for: Ideal for oily skin types.

How to use: Apply 4 to 5 drops to clean, dry skin in the morning and evening. Layer with other serums as needed. Can be used twice a day.

Paraben-free; phthalate-free; sulfate-free; silicone-free; oil-free; fragrance-free Made in the USA Item #7505938