The source of retinol (vitamin A) is:

The source of retinol (vitamin $A$ ) are liver kidney and fish oil. Retinol is that form of vitamin $A$ which is obtained from animal sources. Vitamin $A$ comes from two sources. One group comes from animal sources and is called retinoids, which includes retinol. The other group comes from plants and is called carotenoids, which includes beta-carotene. The body converts beta-carotene to vitamin $A$.