A number of studies have suggested a connection between an increased risk of heart attack or other heart-related disorders and a diet heavy in calcium supplements. However, this association remains controversial. The National Osteoporosis Foundation and the American Society for Preventive Cardiology have identified no such association in more recent research.
According to other specialists, the association between calcium supplementation and cardiovascular disease may have been coincidental.
If you believe you may require a calcium supplement, the best course of action is to speak with your doctor about the potential benefits and drawbacks. Whenever possible, you should aim to obtain an adequate amount of calcium through the diet. There is no evidence that a high calcium intake through diet is associated with an increased risk of heart disease.