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Vitamin C also helps the body absorb iron, so for anemia, it's a valuable supplement. It's estimated that only about 10 to 20 percent of adults eat the recommended nine servings of fruits and vegetables a day.{relatedarticles}A good supplement will provide the rest of that vitamin C, but more isn't necessarily better. While it's tough to overdose on vitamin C because the body excretes the excess, 500 milligrams or more may irritate the stomach.