Definitions

Is a fat-soluble vitamin that was discovered in 1913. Vitamin A is a very important vitamin for maintaining a strong immune system, healthy skin, fertility, adrenal and thyroid functioning, structure and function of nerve cells, and cell growth but is best known for its role in the visual system. Butterfat and cod liver oil are two excellent sources of Vitamin A. This vitamin can also be formed from beta-carotenes and other carotenes found in vegetables such as dark leafy greens, squash, carrots and sweet potatoes.