Vitamin K is a vitamin present in leafy green vegetables, broccoli, and Brussels sprouts. It has many medicinal uses including the treatment of osteoporosis.

*Note: Vitamins D and K play an essential role in calcium metabolism. One of vitamin D’s primary functions is to promote calcium absorption and maintain adequate levels in the blood. However, it does not precisely govern where calcium is deposited in the body. Therefore, to maximise the benefits of vitamin D supplementation while minimising the potential risk of toxicity, some authorities suggest that vitamin K supplements should also be taken. This is because vitamin K activates a protein that helps to direct calcium to the areas it is most needed (i.e., bone) and prevents it from accumulating in the soft tissues, such as the kidneys and blood vessels, where it can have detrimental effect.