Vitamin K is one of four fat-soluble vitamins and is stored in body fat and in the liver. It is needed for clotting blood and also plays a role in bone health. There are three kinds of vitamin K: K1, which is naturally found in foods; K2, made by normal bacteria in the intestines; and K3, a synthetic form too potent for use in humans. The U.S. allows only the use of K1 in supplementation. And although K1 is not toxic, it can be contraindicated for some medications and conditions.
Nuturally Occuring Vitamin K
Dietary sources for vitamin K1 include green leafy vegetables, green tea, some vegetable oils, prunes and avocados. According to Martin J. Shearer, researcher at the Centre for Haemostasis and Thrombosis in London, "Natural forms of vitamin K have no proven toxicity." However, patients who are also taking anticoagulant medication, or blood thinners, may "jeopardize their anticoagulant control." Vitamin K can be administered orally or intravenously.
Efficacy
According to MedlinePlus, effective uses for vitamin K include deficiency supplementation, treatment of bleeding/clotting disorders and regulation of anticoagulant intervention. The evidence for the efficacy of vitamin K in treating other conditions is insufficient, including but not limited to, osteoporosis, high cholesterol, spider veins and burns.
Warnings
Other than prescription blood thinners, precautions for using vitamin K include women who are pregnant or breast-feeding or people with kidney or liver disease. MedlinePlus warns that some herbal supplements can interact with vitamin K. Co-enzyme Q-10, it reports, contains blood clotting properties and in combination with vitamin K can be problematic. Vitamin A, E and Tiratricol, a thyroid medication, can also challenge the effectiveness of your body's blood clotting or blood thinning facilities.
Considerations
Since the United States considers vitamin K a dietary supplement, it does not fall under the Food and Drug Administration's regulations, therefore ingredients in K supplements and their quantities may vary. Consult a physician prior to taking a vitamin K supplement.
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