NIA24 Intensive Retinol Repair is formulated with patented Pro-Niacin and two forms of Retinol to address multiple signs of aging. Pro-Niacin speeds the conversion of Retinol to Retinoic Acid, 12 times faster so skin absorbs more of it. Overtime, skin gets all of the anti-aging benefits of Retinoic Acid without the irritation. Benefits: improves the appearance of deep lines and wrinkles. Promotes skin firmness and radiance. Reinforces skin's natural barrier.