Vitamin k is another fat-soluble vitamin essential for body functions. It comes in 2 forms phylloquinone (vitamin K1) and menaquinones (vitamin K2) .
Vitamin k1 is the main dietary form of vitamin k and is present abundantly in plant sources. Whereas k2 is available through fermented foods and animal sources but only in small quantities.
Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones.
Vitamin K is found throughout the body including the liver, brain, heart, pancreas, and bone. It is broken down very quickly and hence rarely reaches toxicity level.
Compared to the other fat-soluble vitamins, very small amounts of vitamin K circulate in the blood.
Symptomatic vitamin K deficiency and impairment of normal hemostatic control in healthy adults may take more than 2–3 weeks to develop at ‘low’ phylloquinone intake (i.e. < 10 mcg/day) .