Vitamin A is an essential vitamin that provides a wide range of nutritional support for the entire body. It is required for the healthy functioning of a number of biological processes, including its best known role in vision. Vitamin A is critical for the function of the retina and colour vision. It also supports light-to-dark adjustment through its affinity for the rhodopsin-opsin system. Vitamin A has been shown to stimulate the immune response and resistance to pathogens, particularly in the mucosa. This fat-soluble vitamin also maintains the integrity of mucosal and epithelial surfaces by regulating the differentiation of epithelial cells, sebum production and moisture in the skin. Adequate levels of vitamin A are also important for normal bone metabolism and bone mineral density.
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