Osteoporosis is not caused by a lack of limestone, oyster shell or bone meal. Heart attack, however, may be caused by an excess consumption of exactly these "elemental" forms of calcium, according to two high-powered meta-analyses published last year in the British Medical Journal.
New research published this week in the journal Heart has confirmed the findings of two controversial studies on calcium supplementation and heart attack risk published in the British Medical Journal last year, and which found a 24-27% increased risk of heart attack for those who took 500 mg of elemental calcium a day.
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