This means it must be dissolved in fat to be carried into the body can be stored in fat in the body tissues, therefore does not have to be ingested every day and can build up to toxic levels is likely to be deficient in persons who eat an extremely low-fat diet. Unless one eats polar bear or python liver it would not be possible to obtain toxic amounts from foods. Sources of true vitamin A are only found in animal sources since vitamin A is made in the liver from its precursor, Beta Carotene. Vitamin A sources are liver, butter, fortified milk and margarine. Beta Carotene sources are orange and dark green vegetables and fruit.
Beta carotene is the dye that makes carrots orange.
The darker the orange color the more beta carotene is in the food. For a green food to contain beta carotene it must be dark enough to conceal orange. It should be noted that persons with diabetes can not make the conversion from beta carotene to vitamin A and should use a source of preformed vitamin A such as liver. Digestion is not required for vitamins. Absorption can only take place if there is fat or oil in the digestive tract at the same time as the vitamin.