Vitamin A is most commonly found in two forms: preformed vitamin A (or retinol) and beta-carotene. It is needed to maintain healthy skin, prevent night blindness and protect against cancer and other diseases. Studies show it may also help keep your blood sugar balanced. Vitamin A is fat soluble. Taking Vitamin A supplements with fatty foods and with Vitamin E will help with absorption. The best sources of Vitamin A are liver, fish liver oil, dark green and orange vegetables, and milk products.