Niacinamide is a form of Vitamin B3 - one of the eight B Vitamins needed for a healthy body and skin. Vitamin B3 helps reduce the appearance of imperfections, leaving the complexion smoother. It helps improve the skin’s barrier function to protect it from external pollutants and prevent loss of moisture. The product targets rough skin texture, dryness, and blemishes. Suitable for all skin types. If you are using a JUST Vitamin C serum, the JUST Niacinamide should be applied at the opposite time of the day, as the two can interact negatively with each other. Individual intolerance to the product is possible. If discomfort occurs, discontinue using the product.