Vitamin K's Newest Function
NEW YORK--The Journal of the American Dietetic Association (JADA) has published a new study reporting that some adults may be getting too little vitamin K. Vitamin K, recognized for helping blood to clot, has another benefit--improving bone strength.
The Recommended Dietary Allowance (RDA) for women is set at 65 micrograms (mcg) and 80 mcg for men. Some research indicates that 109 mcg of vitamin K is necessary for continued bone strength. Research at Harvard University found that women who consumed less than 109 mcg per day sustained 30 percent more hip fractures over a 10-year period--consuming more than 109 mcg did not prove more beneficial. Dark green, leafy vegetables are the best source of vitamin K.