Use
vitamin D acts as a keratinization regulator, helping to improve skin feel and firmness with repeated use. This vitamin is absorbed through the skin’s outer layers. Studies are indicating that vitamin D is an important factor in epidermal cell turnover. It is generally found in combination with vitamin A, as such a mixture appears to help epithelial growth and promote good skin pigmentation. Like vitamin A, vitamin D is a major constituent of many fish and vegetable oils.