Keratin thickens with age due to deceleration of the skin turnover cycle, causing rough, dry skin. Not only does retinyl palmitate, which is contained in Retina Oil, give thickness to the epidermis by improving the metabolism of the skin, but it also leaves the surface of the skin soft and youthfully moisturized by appropriately removing old keratin. In addition, wrinkles form in the skin with age as a result of the dermis becoming thinner due to decreases in the quantity and quality of fibroblasts. However, retinyl palmitate thickens the dermis and makes the skin supple by activating fibroblasts.