Calcium supplements...increase the risk of cardiovascular events

An analysis has found that there is a 30 percent increased risk of myocardial infarction for those taking 500 mg or more of elemental calcium.

http://articles.mercola.com/sites/articles/archive/2011/08/15/is-your-calcium-supplement-a-heart-attack-or-stroke-waiting-to-happen.aspx?e_cid=20110815_DNL_art_1