Vitamin K for Bone Health

Research suggests that vitamin K plays a meaningful role in bone health, primarily through its ability to activate key proteins such as osteocalcin and matrix Gla-protein, which help direct calcium into bone tissue and support bone mineralization. Several narrative reviews support the idea that vitamin K works synergistically with vitamin D in calcium metabolism, and observational studies have linked higher vitamin K intake to reduced hip fracture risk in older adults. However, the evidence is notably mixed when it comes to supplementation outcomes: clinical trials in white postmenopausal women generally have not shown improvements in bone mineral density, evidence on fracture reduction remains conflicting, and a 2025 mouse study found that raising bone levels of one vitamin K form through supplementation did not translate into measurable skeletal benefits. The available literature consists largely of narrative reviews and observational data rather than large, well-designed randomized controlled trials, and multiple review authors across different years have independently called for further clinical research before firm conclusions about supplementation can be drawn.