Even Low-Dose Vitamin K2 Can Disrupt Blood Thinners

Dr. Kumar’s Take:

This study highlights an important warning: even small doses of vitamin K2 (as low as 10 mcg daily) can interfere with the stability of Vitamin K antagonizing blood thinners like Coumadin. While K2 is often promoted for bone and heart health, patients on vitamin K antagonists (like warfarin or acenocoumarol) should avoid taking MK-7 supplements without medical guidance. The impact on INR was significant in many participants, even at low doses.

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Can a Japanese Superfood Help Prevent Bone Loss?

Dr. Kumar’s Take:

This study offers strong population, level evidence that natto, a traditional Japanese food made from fermented soybeans, may help reduce bone loss in postmenopausal women. Natto is high in menaquinone-7 (MK-7), a form of vitamin K2 that helps activate proteins needed for healthy bones. Frequent natto consumption was linked to less bone loss in key skeletal sites like the femoral neck.

If you’re looking for a food-based way to support bone health, especially post-menopause, adding natto to your weekly diet might be worth considering.

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