A new research suggests that calcium intake may not be a solution for preventing osteoporosis.
The research was based on the data from large, prospective studies that followed people for many years.
In the research, trials were conducted to test what effect calcium might have on fracture rates.
Two studies showed that calcium didn't prevent fractures, even when taken in combination with vitamin D. Another study showed that postmenopausal women who took a calcium-vitamin D combination were no less likely to break their hip than women who took a placebo pill.
And other researchers reported the results from a meta-analysis of studies on calcium that found no connection between high calcium intake and lower hip fracture risk.
While a certain level of calcium intake is undoubtedly important to keeping bones strong, amounts above that level might not do much good, said the research team.
One reason some of these studies on supplements may not have shown a benefit is because the study participants were already getting over 1,000 milligrams (mg) of calcium daily through diet.
The study is published in the March 2008 issue of the Harvard Health Letter.