The importance of vitamin K and the combination of vitamins K and D for calcium metabolism and bone health: A review. Published 2024 Jul 25. doi:10.3390/nu16152420Maresz K. Proper calcium use: Vitamin K2 as a promoter of bone and cardiovascular health. The combined effect of vitamin K and calcium on bone mineral density in humans: a meta-analysis of randomized controlled trials. Effects of vitamin K supplementation on bone mineral density at different sites and bone metabolism in the middle-aged and elderly population. Effect of low-dose vitamin K2 supplementation on bone mineral density in middle-aged and elderly Chinese: A randomized controlled study.