[Paula’s Choice] 20% Niacinamide Treatment 20ml[Paulas Choice] 20% Niacinamide Treatment 20ml This highly concentrated Niacinamide serum visibly tightens and minimize pores, and effectively brighten uneven skin tone. Improve skin texture for younger look complexion. How to Use Apply a few drops to your face (or dot onto rough, bumpy areas) once or twice daily after cleansing, toning, and exfoliating. At night, layer with other serums and treatments, following with a moisturizer. For daytime wear,