Interesting! I have a dear friend on blood thinners, who takes D3 but says she cannot take K2 because of the clotting potential. How much K2 do you take with your now-5,000iu of D3? I wish she had either a functional med doc or a naturopath, but in the area we’re in, it’s matrix medicine all the way. Given my issues, above, I will pass on…

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Yes, to this! I took D3 for years without ever hearing of the need for K2 with it — and developed some heavy calcification in my aorta! I also now have a heart murmur, not sure it’s related. But I dutifully take 200mcg K2 with my 5,000iu D3. I do fine, still, even with fairly heavy exercise, so I probably lucked out. Whew! But I wish I’d known earlier.