This article suggests that people should not take calcium supplements be because they can cause calcium deposits in arteries --- raising the risk of cardiac problems.
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Controversy over calcium supplements arose when a combined analysis of 15 studies by Dr. Mark J. Bolland of the University of Auckland found that when calcium was taken without vitamin D (which enhances calcium absorption), the supplements increased the risk of heart attack by about 30 percent.
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Until such information is available, consumers seeking to preserve their bones would be wise to rely primarily on dietary sources of the mineral and to pursue regular weight-bearing or strength-building exercises, or both. Walking, running, weight lifting and working out on resistance machines is unquestionably effective and safe for most adults, if done properly.
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