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Human studies are being done with doses of 360 mcg / day so up to that level is likely safe. While MK-7 does not interfere with blood thinners if you are taking them it is always good to consult with your physician. PS - they may not be aware of the most up to date research on MK-7.
I take 100 mcg of MenaQ7 MK-7 / day along with 5,000 IU (125 mcg) of D3 daily.