And, while calcium from dietary sources protects the heart, supplements of the mineral may spell heart trouble, according to a growing number of studies that link them to cardiac events, including heart attacks. Excess amounts (more than 2,500 mg a day) can harm the kidneys and reduce absorption of other minerals like iron, zinc, and magnesium. “Americans love to take supplements and think, ‘Well, it can’t hurt,’” says Donald Miller, PharmD, professor in the Department of Pharmacy Practice at North Dakota State University in Fargo.īut, actually, it could, Dr. Although some individuals may have trouble getting enough calcium through food and beverages, calcium supplements should be taken only with a doctor’s okay. Most people can and should meet their calcium needs through diet alone.
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