Clinikally The Ultimate NIA (10% Niacinamide) SerumClinikally The Ultimate NIA (10% Niacinamide) Serum is a dermatologist formulated face serum designed to target multiple common skin concerns with a high strength 10 % niacinamide base. It has a lightweight, non greasy texture that absorbs quickly into the skin. The serum is suitable for all skin types and is especially useful for oily, acne prone, and sensitive skin.