Vitamin A is the name of a group of fat-soluble retinoids, including retinol, retinal, and retinyl esters . Vitamin A is involved in immune function, vision, reproduction, and cellular communication . Vitamin A is critical for vision as an essential component of rhodopsin, a protein that absorbs light in the retinal receptors, and because it supports the normal differentiation and functioning of the conjunctival membranes and cornea . Vitamin A also supports cell growth and differentiation, playing a critical role in the normal formation and maintenance of the heart, lungs, kidneys, and other organs .
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