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Vitamin A

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Vitamin A Functions & Deficiencies

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How to Use Vitamin A (Retinol, Retinoids & Retin-A) In Your Skincare Routine For Clear Skin

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Vitamin D and Renal Disease - Mayo Clinic

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Health Benefits of Vitamin A (Retinol)

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26 Foods High in Vitamin A for Healthy Eyes

Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids. Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light and color vision. Vitamin A also functions in a very different role as retinoic acid, which is an important hormone-like growth factor for epithelial and other cells.