Vitamins & Supplements Archive

Q. My internist told me to take calcium because I have osteoporosis. However, I heard that blockages in heart arteries could also contain calcium. Am I hurting my arteries by taking calcium supplements?

A. Doctors often recommend calcium supplements for people with osteoporosis, and I'd advise you to follow your physician's advice, as calcium is important for bone health. The Recommended Dietary Allowance for calcium for adults is 1,000 to 1,200 milligrams (mg) a day; dairy products are the best sources. For healthy people who get enough calcium in their diets, the role of calcium supplements is less clear, although some people hope that taking them may help preserve bone strength.

New guidelines from the U.S. Preventive Services Task Force say that there’s no evidence vitamin D screenings help seemingly healthy people.

Q. I've heard that low vitamin D levels have been linked to heart disease, so I'm wondering if I should
be taking a vitamin D supplement, just in case. What's your advice? 

A. I suggest that you make sure you're getting the Recommended Dietary Allowance for vitamin D, which is 600 international units (IU) for adults up to age 70 and 800 IU for those older than 70. It's true that low vitamin D levels have been linked to heart disease in some studies. However, low vitamin D might just be a consequence of a poor diet and lack of exercise, which can contribute to obesity, heart disease, and a host of other health problems. And to date, there is no evidence that taking additional vitamin D helps prevent or treat any of those conditions, though large studies are ongoing and should provide a definitive answer in the next few years.

Are you getting enough calcium, potassium, and magnesium to keep your blood pressure in a healthy range?

Cutting back on salt is the first commandment in controlling high blood pressure, or hypertension. But managing your intake of other dietary minerals also appears to be key. "We're moving beyond just looking at sodium," says Kathy McManus, director of the Department of Nutrition at Harvard-affiliated Brigham and Women's Hospital. Research from the landmark DASH (Dietary Approaches to Stop Hypertension) trial and more recently the OmniHeart study has shed light on the synergy of different foods and the role of minerals such as potassium, calcium, and magnesium in controlling blood pressure.