Recently, several studies have reported an increase in heart attacks with supplemental calcium. To examine this relationship further, Samelson et al. (The American Journal of Clinical Nutrition) reviewed food-frequency questionnaires and CT scans of over 1,200 men and women in the Framingham Offspring Study. The authors used coronary artery calcification (atherosclerosis) as their measure of predictive risk for heart disease.

Conclusions: “Our study does not support the hypothesis that high calcium intake increases coronary artery calcification, which is an important measure of atherosclerosis burden. The evidence is not sufficient to modify current recommendations for calcium intake to protect skeletal health with respect to vascular calcification risk.”

Samelson, et al., 2012. Calcium intake is not associated with increased coronary artery calcification: the Framingham Study. The American Journal of Clinical Nutrition doi: 10.3945/ajcm/112/044230.