Vitamin A

Vitamin A is a fat-soluble vitamin involved in vision (especially night vision), immune function, cell growth and differentiation, and skin and mucous membrane health. It exists in two primary forms: preformed vitamin A (retinoids) found in animal products and provitamin A (carotenoids) found in plants and converted in the body. Vitamin A is available in supplement forms such as retinyl palmitate, retinyl acetate, and beta-carotene.