Should women on HRT with cardiac risk factors take calcium supplements?

Controversial. Researchers in a large study found that "... Increasing calcium intake from diet might not confer significant cardiovascular benefits, while calcium supplements, which might raise [heart attack] risk, should be taken with caution." the increased risk may be due to high levels of calcium from 1-2 doses of supplement as opposed to the small amounts absorbed from diet. Ask your cardiologist on this.