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Vitamin A is an essential human nutrient. It exists, not as a single compound, but in several forms.
Vitamin A RetinolIn foods of animal origin the major form of vitamin A is an alcohol (retinol), but can also exist as an aldehyde (retinal), or as an acid (retinoic acid).
* retinol, the animal form of vitamin A, is a yellow fat-soluble, antioxidant vitamin which is important for vision and bone growth.
* other retinoids, a class of chemical compounds that are related chemically to vitamin A, are used in medicine.
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