"The study, conducted over 11 years and following 24,000 people looked at the supplementation habits of people who were not only healthy but also had a variety of health conditions.
What they found was alarming- people who included calcium as a staple
in their supplements were more than 80% more likely to suffer from a
heart attack as those who did not supplement with calcium."
Here is the link if you would like to read more about the study: