Retinol is the INCI designation for vitamin A1 (see there). Retinol is the strongest form of the essential and fat-soluble vitamin A contained in animal food, fruit and vegetables. As retinol is responsible for the growth processes of the cells, the skin benefits enormously from the effect of this vitamin. It supports the natural anti-aging effect. Formerly used to combat pimples, retinol is now increasingly used to combat wrinkles and skin aging.