Vitamin A What is Vitamin A? Vitamin A refers to a group of compounds, including retinol , retinal , retinoic acid , and provitamin A carotenoids (e.g., beta-carotene). It exists in two primary forms: 1. Preformed Vitamin A (Retinoid) : Found in animal-based foods like liver, fish, eggs, and dairy. Retinol is the most bioavailable form. 2. Provitamin A (Carotenoids) : Found in plant-based foods like carrots, sweet potatoes, and spinach. Beta-carotene is the most common carotenoid, which the body converts to vitamin A. Uses and Functions of Vitamin A Vitamin A plays critical roles in: 1. Vision : Retinal, a form of vitamin A, is a component of rhodopsin, a pigment in the retina that enables vision in low-light conditions. It also supports overall eye health. 2. Immune System : Vitamin A strengthens the immune system by maintaining the integrity of mucous membranes (barriers against pathogens)...
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