Is Calcium a Bust for Bones?
Regular Use of Supplements May Be the Key for Older Women's Hip Strength
Feb. 15, 2006 -- Calcium and Vitamin D supplements may help protect some older women's hips -- but only when taken regularly, a new study shows.
The study, published in The New England Journal of Medicine, followed more than 36,000 healthy, postmenopausal women for an average of seven years.
Women who were assigned to take calcium and vitamin D twice daily -- and did so -- were 29% less likely to fracture their hips than those who got fake supplements (placebo). Women not adhering to the daily vitamins had only a slightly lower risk of hip fractures compared with placebo.
However, calcium and vitamin D supplements didn't seem to cut the women's risk of other bone fractures, write the researchers. They included Rebecca Jackson, MD, of Ohio State University.
"This all really points to the ability of women at highest risk of osteoporosis to make their own informed choices about the supplements they take," Jackson says in a news release.
The study was part of the Women's Health Initiative, which has covered a wide range of women's health issues.
Bone Health Debate
A journal editorial takes a slightly different view.
"Unfortunately, although the trial was well conducted, the results ... leave many questions unanswered," writes editorialist Joel Finkelstein, MD, of Boston's Massachusetts General Hospital.
"It seems reasonable to recommend that women consume the recommended daily levels of calcium and vitamin D through diet, supplements, or both," Finkelstein writes. "But one message is clear: Calcium with vitamin D supplementation by itself is not enough to ensure optimal bone health."
"Calcium with vitamin D supplementation is akin to the ante for a poker game: It is where everyone starts," he continues. A woman at significant risk of fracture "probably needs something more."
Real Supplements vs. Fakes
The researchers gave half the women calcium and vitamin D supplements. The other half got fake supplements (placebo). The women didn't know which pills they'd gotten.
The women took one pill twice daily at meals. The real supplements each contained 500 milligrams of calcium and 200 international units of vitamin D.
Many women already had several factors in their bones' favor before the study started, Jackson's team notes.