Vitamin K is a fat-soluble vitamin that cannot be built by the body, so it must be obtained through diet or supplementation. Vitamin K facilitates calcium absorption for strong bones, encourages positive heart and kidney function, and supports healthy aging. The three forms of vitamin K are vitamin K1 (phylloquinone), vitamin K2 (menaquinone), and vitamin K3 (menaphthone), which is a synthetic form of vitamin K that can cause liver toxicity and is not available as a dietary supplement. Vitamin K2 (as MK-7) is the most bioavailable and biologically active form of vitamin K2.
This form of K2 is naturally present in high amounts in the Japanese food, natto, which is made with fermented soybeans. MK-7 has the highest biological half-life, which means it is available for use by the body over a longer period of time and ensures consistent serum vitamin levels.
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