Give your skin a healthy glow with Olayâs Niacinamide Serum that helps corrects dark spots gives pearl like radiance and provides a healthy glow. This lightweight serum penetrates 10 layers deep into your skin to give clearer and more even skin from Day 1 Olayâs bioavailable Niacinamide fights the 7 signs of uneven skin â acne marks dullness enlarged pores rough skin dryness uneven skin dark spots.