Why was this study done?

Bone Loss is a major concern, especially for women. This study was designed to test three different approaches to maintaining bone mass in post-menopausal women. The first was 1400 mg of supplemental calcium and 400 IU of vitamin D, the second was 1400 mg calcium and 400 IU, plus other bone-active nutrients, the third was to increase calcium from food sources.

What did the study find?

All three approaches were successful at reducing typical bone lose seen in aging women.

Effect of Nutrient Intervention on Bone Mineral Density and Biomarkers of Bone Remodeling.
Authors: Jenkins AL, Block G. 
Am J Epidemiol 1999. 149(11):S30.PDF Abstract: Am J Epidemiol, 1999.