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Vitamin K and bone health
Maryam S Hamidi1, Olga Gajic-Veljanoski, Angela M Cheung
1Osteoporosis and Women's Health Programs at University Health Network, Toronto, ON, Canada.
Summary
Vitamin K plays a role in bone health, but current evidence is insufficient to recommend vitamin K supplements for preventing osteoporosis or fractures in postmenopausal women.
Area of Science:
- Nutritional Science
- Bone Metabolism
- Gerontology
Background:
- Vitamin K is essential for osteocalcin gamma-carboxylation, a key process for bone health.
- Two primary forms, vitamin K1 and vitamin K2, differ in sources and biological activity.
- Epidemiological studies link high dietary vitamin K intake to reduced hip fracture risk in aging individuals.
Purpose of the Study:
- To evaluate the efficacy of vitamin K supplementation on bone health and fracture risk.
- To compare the effects of vitamin K1 and vitamin K2 on bone mineral density and fracture incidence.
- To determine if current evidence supports routine vitamin K supplementation for osteoporosis prevention.
Main Methods:
- Review of randomized controlled trials (RCTs) on vitamin K1 and K2 supplementation.
- Analysis of studies examining bone mineral density at major skeletal sites.
- Assessment of trials with fracture as a primary outcome, noting methodological limitations.
Main Results:
- RCTs in white populations did not show increased bone mineral density with vitamin K1 or K2 supplementation.
- Some studies suggest potential fracture risk reduction with vitamin K supplementation, but with significant methodological limitations.
- Lack of large, well-designed trials comparing vitamin K1 and K2 efficacy for fracture prevention.
Conclusions:
- Current evidence is insufficient to recommend routine vitamin K supplementation for osteoporosis and fracture prevention in postmenopausal women.
- Further large-scale, well-designed trials are necessary to clarify the roles of vitamin K1 and K2 in bone health and fracture reduction.
- The differing biological activities of vitamin K1 and K2 warrant further investigation in diverse populations.
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