A study done by the University of Zurich in the the journal Heart were based on data from almost 24,000 men and women in Germany aged 35 to 64 who were tracked for an average of 11 years as part of a European cancer and nutrition project.  The study of those who regularly took calcium supplements were 86 percent more likely to have a heart attack than those who didn’t. Those who took only calcium supplements were twice as likely to suffer a heart attack as those who didn’t take any vitamin supplements.
Calcium pills double risk of heart attacks, scientists say