Retinol is an important vitamin because it mediates physiological and metabolic mechanisms in the body. It is a crystalline yellow-orange solid that is present in plants and animals as carotenoids and preformed retinol respectively. Retinol is composed of the beta-ionone ring and isoprenoid chain with a functional alcohol group (-OH) at the terminal. Retinol is important in vision, regulation of translation, and treatment of skin. However, excessive intake predisposes one to osteoporosis, cancer, congenital defects, hormonal imbalance, and hepatic injury.
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