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Vitamin K is a vitamin found in leafy green vegetables, broccoli, and Brussels sprouts. Several forms of vitamin K are used around the world as medicine. Vitamin K1 (phytonadione) and vitamin K2 (menaquinone) are available in North America.
Naturally occurring forms of vitamin K include phylloquinone (vitamin K 1) and a family of molecules called menaquinones (MKs or vitamin K 2). (More information) With limited vitamin K storage capacity, the body recycles vitamin K in the vitamin K oxidation-reduction cycle in order to reuse it multiple times.