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| The vitamin K present in plant foods is called phylloquinone; while the form of the vitamin present in animal foods is called menaquinone. Both of these vitamins are absorbed from the diet and converted to an active form called dihydrovitamin K. Cow's milk is also a good source of the vitamin, as are soy foods, egg yolks, and cauliflower. A portion of the body's vitamin K is supplied by bacteria living in the intestine rather than by dietary sources. Function; Reasons For Use Vitamin K is a fat-soluble set of molecules that are required for the health of the human population. First discovered in the treatment of chicks with hemorrhagic diseases, vitamin K is vitally involved in the process of blood clotting. Three forms of biologically active vitamin K are known, they are menadione, phylloquinone, and menaquinone-7. Not only is vitamin K involved in the synthesis of clotting factors VII, IX, and X; it is also involved in the conversion of pre-prothrombin to prothrombin (the precursor to thrombin), which is important in fibrin blood clot formation. The most common deficiency of vitamin K is at birth since vitamin K does not traverse well through the placenta, nor through breast milk. It is very common to give an intramuscular vitamin K shot to newborns for this reason. When needed for the correction of prolonged bleeding due to over-anticoagulation with warfarin, oral vitamin K (1-5mg) was found to be as effective as IV administration, but had a slower onset of action. [Br J Haematol 2001;115(1): pp.145-149]. Directions The US RDA recommends 1mcg of vitamin K per kilogram of weight per day. Counter-Indicators People on any drug that is intended to change the blood clotting time, like coumadin, should contact their physician before taking large amounts of vitamin K. |
| Bruising Susceptibility Hepatitis Menorrhagia (Heavy Periods) Multiple Myeloma Osteoporosis - Osteopenia Vitamin K Requirement |