Harvard Heart Letter

Calcium supplements and heart attack

Your body needs calcium to build bones, contract muscles, send nerve signals, help enzymes and genes do their jobs, and much more — including making your heart beat. Some time in middle age, calcium seems to start moving from bones to the cardiovascular system, where it stiffens arteries and heart valves. A report linking calcium supplements to an increased risk of heart attack now has researchers eyeing too much calcium as a possible contributor to heart disease, stroke, and other cardiovascular conditions.
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