What it is: A total acne care serum formulated with 15% niacinamide.Who it's for: Ideal for all skin types.What it does: The highly concentrated serum combines maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control. It is noncomedogenic and won't clog pores.Research results:In a clinical trial on 20 subjects, over 4 weeks:- 45.27% improvement of activated sebaceous glands- 48.07% improvement of oil synthesis amount- 42.72% improvement of number of blackheads- 50% improvement of number of whiteheads- 15.50% improvement of hidden melasma and blemishes- 19.47% improvement of pigmentation (visible melasma and blemishes)- 2.59% improvement of triple-complexion skin tone (brightness)- 24.89% improvement of triple-complexion skin tone (redness)- 11.73% improvement of triple-complexion skin tone (yellowness)How to use: After cleansing, during the serum phase, apply a few drops of the Niacinamide serum to the skin. Use fingertips to gently massage and absorb the serum, starting from the center of the face, working towards the edges. Use the serum in the morning, evening or afternoon. If applied during the morning/day, be sure to use sunscreen with an SPF of 30 or higher. 0.67 oz.