How Much Calcium Do Adults Need Daily? A Doctor Tells You! by Donna John

Dr. Christopher Calapai recommends adults ages 19 to 50 take 1,000 mg of calcium daily. If you don’t receive enough calcium from your diet, you may need to take a supplement containing elemental calcium. Elemental calcium refers to the actual amount of calcium in a supplement that's available for your body to absorb. 

Read the labels carefully! “For example, if you buy tablets such as calcium carbonate, each tablet contains 1,250 mg of calcium,” he says. “Unfortunately, only 500 milligrams is elemental calcium.”

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