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Toxicity is rare and unlikely to result from eating foods containing vitamin K. Vitamin K can interact with several common medications, including blood-thinners, anticonvulsants, antibiotics , cholesterol-lowering drugs, and weight-loss drugs. Blood thinners , such as warfarin are used to prevent harmful blood clots that may block blood flow to the brain or heart.
Suddenly increasing or decreasing vitamin K intake can interfere with the effects of these drugs. Keeping vitamin K intake consistent from day to day can prevent these problems.
Anticonvulsants , if taken during pregnancy or while breastfeeding, can increase the risk of vitamin K deficiency in a fetus or a newborn. Examples of anticonvulsants are phenytoin and dilantin. Cholesterol-lowering medications interfere with fat absorption. Dietary fat is necessary for absorbing vitamin K, so people who are taking this medication may have a higher risk of deficiency. Anyone who is taking any of these medications should speak to their doctor about their vitamin K intake.
The best way to ensure the body has sufficient nutrients is to consume a balanced diet, with plenty of fruit and vegetables.
Supplements should only be used in case of deficiency, and then, under medical supervision. New research examines whether genetic predisposition to high vitamin D levels affects overall health and mortality risk. What are some of the best omega-3 supplements?
Learn about the possible benefits of these supplements and what to look for when buying them. People who are prescribed anticoagulants also called blood thinners to prevent blood clots from forming in the heart, lung, or legs are often informed about vitamin K. Because of its blood clotting action, vitamin K has the potential to counteract the effects of blood thinning medications.
A common method that estimates blood levels of vitamin K is measuring prothrombin time PT , or how long it takes for blood to clot.
People on anticoagulant medication such as warfarin Coumadin may be advised to eat a consistent amount of vitamin K from food and supplements. Vitamin K is not a required listed nutrient on the Nutrition Facts label, but people taking anticoagulant medication are usually provided information about foods containing vitamin K from their health care provider. Vitamin K is involved with the production of proteins in bone, including osteocalcin, which is needed to prevent the weakening of bones.
Some studies have shown that higher vitamin K intakes are associated with a lower incidence of hip fractures and low bone density. In addition, low blood levels of vitamin K have been linked with low bone density. Data from the Framingham Heart Study also showed an association between high vitamin K intake and reduced risk of hip fracture in men and women and increased bone mineral density in women. A few studies have researched the role of vitamin K for heart health. Vitamin K is involved with the production of matrix Gla proteins MGP , which help to prevent calcification or hardening of heart arteries, a contributor to heart disease.
Because research in this area is very limited, additional studies are needed before a specific amount of vitamin K beyond the standard recommendation is proposed for this condition. Green and black tea leaves do contain vitamin K before they are steeped in water, but a small serving of the hot tea itself does not. Check with your doctor before you take any supplements or herbal products. Some of these may contain vitamin K. If you already take a product that contains vitamin K, do not stop taking it without talking with your doctor first.
To find out how well warfarin is working, you will get blood tests to measure how long it takes for your blood to clot. You may just hear about your INR. Your INR needs to be in a safe range—not too high and not too low. Vitamin K can change how warfarin works, which changes your INR.
Author: Healthwise Staff. Medical Review: E. This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information.
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