Vitamin A is required for the proper growth of an individual as well as for good vision, reproduction, and repair of skin and other epithelial tissue. Therefore, vitamin A supplement is the helpful for problems caused by its deficiency, such as certain cataracts, night blindness, and skin problems such as acne and eczema. MedlinePlus mentions numerous other uses of vitamin A.
Source: http://www.nlm.nih.gov/medlineplus/druginfo/natural/964.html
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