In fact, recent research has found that vitamin K deficiency is much more common than previously believed. Antibiotics destroy intestinal flora which are the source of vitamin K in the body. Cholesterol lowering drugs, Olestra and anything that interferes with fat utilization reduces vitamin K. Mineral oil laxatives interfere as well. Low fat diets can also be detrimental to vitamin K as are very high protein diets that do not include greens. Vitamin K in Foods High concentrations of Vitamin K are found in green leafy vegetables.
Spinach is especially important.
But it is now known that also eating large amounts of fruits and vegetables can supply the body with the vitamin k it needs to function. Fermented foods, including some cheeses contain vitamin K. Hydrogenated oils contained in foods like margarine may stop the proper utilization of the vitamin. Since vitamin K is not stored in the body, it is nontoxic. Supplementation dosage will vary due to your health needs, age, diet, and the use of prescription drugs. Consult with your nutritionist or health care provider for the dose good for you.