What it is: A powerful skin-brightening serum that helps reduce the appearance of dark spots and uneven skin tone while improving barrier function.What it does: This advanced formulation effectively reduces skin discoloration, redness and glycation-related skin yellowing, leaving the complexion even and bright. How to use: After cleansing and toning and applying your treatment serums, apply Vitamin B3 to the entire face and neck for maximum skin brightening and anti-aging benefits. Follow with a broad-spectrum SPF in the daytime and moisturizer at night. Use twice daily. 1 oz. Paraben-free; sulfate-free; phthalate-free Made in the USA