Does anyone know anything about taking K2? I need some advice. I advised my father to take k2 with the D3 he is taking. However, he has told me that he takes aspirin daily as a preventative measure (he has high blood pressure). K2 is not to be taken by people using blood thinning drugs I believe. I am not sure what to advise him, as if he takes d3 supplements without k2 I would worry that calcium would build up in his arteries. ( he doesn't have a thyroid problem, but it is his side of the family that suffers from thyroid problems / celiac). Thanks for any help.