Vitamin A is a fat soluble vitamin. Unlike water soluble vitamins that need to be taken daily, fat soluble vitamins are stored in the liver, previously absorbed from dietary fats in the intestine, and do not need to be consumed daily. Vitamin A is also known as retinol because it produces the pigments in the retina of the eye.
Within the body vitamin A plays vital roles including,
enhances vision in low light
strengthens immunity against infections
skin and mucous linings including the nose
Within the body, retinol can be converted to active forms of vitamin A which include retinal and retinoic acid. Precursors to vitamin A are carotenoids and are converted to vitamin A inside the body.
Dietary Sources of Vitamin AVitamin A can be found in the following food sources: liver, cheese, eggs, oily fish, milk and yogurt.
Vitamin A (mg & iu)Most commonly vitamin A is measured in International Units (abbreviated to iu) which is a measurement of its biological activity. It is also measured in retinol equivalents (re) or in milligrams (mg). A retinol equivalent indicates the amount of retinol to which a substance (such as beta-carotene) can be converted in the body.