Calcium supplements, usually taken to improve bone health, may increase the risk of heart attack by as much as 30 percent, according to the findings of the Women’s Health Initiative, a 15-year research project established by the National Institutes of Health to address cardiovascular disease, cancer and osteoporosis.

“If you take calcium supplements, you’ll build up excess calcium in your system that, coupled with mineral deficiencies and imbalances, can cause plaque in arteries, kidney stones, gallstones and more,” says Dr. Robert Thompson, co-author with Kathleen Barnes of The Calcium Lie: What Your Doctor Doesn’t Know Could Kill You. Instead, he recommends taking a trace mineral supplement, preferably in ionic form, whose electrical charge helps bond minerals with water, making the nutrients more easily absorbed. Such a supplement provides all needed minerals, including calcium, in the correct balance.