MONDAY, Feb. 25 (HealthDay News) -- Healthy older women should not take calcium and vitamin D supplements to prevent fractures, according to a final recommendation issued Monday by the U.S. Preventive Services Task Force.

In healthy adults, lower doses of calcium and vitamin D seem to be ineffective. As for higher doses, it's still up in the air, the government group said.

The new recommendations do not apply to people who are known to be vitamin D-deficient or who already have osteoporosis, the U.S. Preventive Services Task Force (USPSTF) noted.

Every year about 1.5 million fractures in the United States are attributed to osteoporosis, which is caused by a decrease in bone mass and density that makes bones fragile and more susceptible to a break. Almost half of all women older than 50 will have an osteoporosis-related fracture in their lifetime, according to the USPSTF.

Calcium is one of the main building blocks of bone growth, and vitamin D (sourced via sunlight's action on the skin, or through diet) helps bones absorb calcium. But at issue is whether people receive enough of these nutrients in their daily diet, or if supplements would help protect them.

Dr. Virginia Moyer, chair of the USPSTF, and a professor of pediatrics at Baylor College of Medicine, said experts know that a "medium dose" of supplements -- less than 400 international units (IU) of vitamin D and less than 1,000 milligrams (mg) of calcium -- does not work.

As for higher doses? "We simply don't know. There are reasons to think they could work, but unfortunately, even though there are a bunch of studies, there are problems with them," Moyer said.

"We know these recommendations will be very frustrating to both physicians and patients, but it's a call to action to the research community," she added.

The USPSTF analyzed a wide range of studies on the effects of supplem
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