Vitamin A is a fat-soluble vitamin essential for numerous bodily functions, including maintaining healthy vision, supporting the immune system, and ensuring the proper functioning of the heart, lungs, and kidneys. It comes in two primary forms: preformed vitamin A (retinol and its esterified form, retinyl ester) and provitamin A carotenoids (beta-carotene, alpha-carotene, and beta-cryptoxanthin), which the body converts into retinol.
