Bok choy is rich in bone-building calcium, as well as vitamins A and C, folic acid, iron, beta-carotene, and potassium,Potassium keeps your muscles and nerves in check while lowering your blood pressure, and research suggests that beta-carotene can reduce the risk of both lung and bladder cancers, as well as macular degeneration. Shoot for a cup a day.
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