Vitamin A also is known as retinol. It is necessary for development and maintenance of normal skin, as well as other tissues and bones. It is consumed in the diet and stored in the liver. Retinol circulates from the liver to the skin and other tissues. Once in the tissues, retinol is converted to retinoic acid (same as Retin A & Renova). Many researchers agree that most retinoids can cause the skin epidermis to become thicker plumper and more youthful looking. Our Pro-Med products reduce the appearance of fine lines and wrinkles, moisturizing while allowing skin to renew itself. These kits help create a smoother, softer, more youthful looking appearance, by helping to enhance the skin's natural rejuvenation process.