A new longitudinal study published in Journal of Bone and Mineral Research found a U-shaped curve for the association between vitamin D levels and fracture risk in older men. In other words, men with both low vitamin D levels and high vitamin D levels had an increased fracture risk.
Vitamin D is traditionally known for its effects on bone health. Vitamin D works in the body to increase the absorption of calcium from the diet. Calcium helps make bones denser and stronger. Vitamin D has independent genetic effects on bone development. Because of this, researchers believe that vitamin D helps prevent as well as heal fractures.
A meta-analysis of four randomized controlled trials by the same group found that vitamin D supplementation results in a 28% reduction in the number of falls per person, per year.