vitamin a benefits

What is Vitamin A? Animals require fat-soluble vitamin A as one of their basic nutrients. The word “vitamin A” refers to a class of chemically related organic substances that comprises various provitamin (precursor) carotenoids, most notably beta-carotene, retinoic acid, retinol, and retinal (also known as retinaldehyde). Vitamin A performs a variety of tasks, including immune…