According to a study from Japan, "Dolomite, a mineral composed of calcium magnesium carbonate, is used as a food supplement that supplies calcium and magnesium. However, the effect of magnesium supplementation on bone metabolism in patients with osteoporosis is a matter of controversy."
T. Mizoguchi and colleagues, Matsumoto Dental University, "examined the effects of daily supplementation with dolomite on calcium metabolism in ovariectomized (OVX) rats."