Ascorbic acid (vitamin C) is used as a dietary supplement when there is not enough ascorbic acid in the diet. People who are most at risk of ascorbic acid deficiency are those who eat a limited variety of foods or those who have problems with intestinal malabsorption due to cancer or kidney disease.
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Vitamin A supplementation is a global health strategy to eliminate vitamin A deficiency and its tragic consequences. Because vitamin A can be stored in the body for a few months, young children only need two high-dose supplements a year.
Vitamins are essential nutrients that help the body perform hundreds of functions, from strengthening bones and healing wounds to converting food into energy and repairing cell damage. Learn more about how vitamins help the body.