What is Vitamin A ?
Vitamin A is a fat-soluble vitamin, an organic compound whose chemical formula is C20H30O. It is stable to heat, acid, and alkali, and is easily oxidized. Ultraviolet rays can promote its oxidative damage. Vitamin A has a variety of physiological functions such as promoting growth and reproduction, maintaining normal secretion of bones, epithelial tissue, vision and mucosal epithelium. Vitamin A and its analogs have the effect of preventing precancerous lesions.