PSA: Before supplementing Vitamin D, do some research on calcification and Vitamin K2.

Or you can trust a random person from the internet and supplement 40mcg K2 mk7 all-trans per every 1000IU of Vitamin D. That seems to be around the usual amount used in studies [1].

I'm not sure if this is the appropriate factor for high Vitamin D dosages of multiple tenths of thousands IU. Personally, I'd be wary of such dosages anyway.

[1] https://www.heise.de/tp/features/Schuetzt-Vitamin-D-vor-Covi...