A concentrated niacinamide serum from Kiehl's designed to mattify and refine pores, the Ultra Pure 5% Niacinamide Oil-Minimising High-Potency Serum has a lightweight, fast-absorbing gel-serum texture. Ideal for oily or combination skin targeting enlarged pores and shine, it’s fragrance-free and suitable for layering under moisturizers. The formula delivers visible mattifying benefits while remaining non-greasy and comfortable for daily use.
Ingredient Safety
No risk4
Low risk6