Low circulating vitamin D (25(OH)D) concentrations have been associated with bone health outcomes including an increased risk of falls and low bone mineral density in some populations, suggesting that low vitamin D levels are a risk factor for osteoporosis.[1]
A recent statement from the U.S. Preventive Services Task Force concluded that the current evidence is insufficient to conclude a benefit of vitamin D or calcium supplementation on fracture prevention in men and women who do not have a known vitamin D deficiency, osteoporosis, or prior fracture.[2][3] However, some studies have found that vitamin D — especially when combined with calcium supplementation — can increase bone mineral density and reduce the risk of fractures and falls in certain populations.[1]