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And some natural sources: https://twitter.com/foundmyfitness/status/105298166965596569...

Does the paper also talk about proper dosages if one wants to supplement with these vitamins? I know it says 4000 UI for vitamin D but don't see any mention for dosages of vitamin K.

10 IU D3 : 2 mcg+ MK-4. Vitamin K2 MK-4 becomes active at 1.5 milligrams, with some taking 5-9 mg daily: https://examine.com/supplements/vitamin-k/.

AOR Ortho-Core has many of these and is especially great when combined with Life Extension D + K and Doctor's Best High Absorption Magnesium.

So does the vegetable section of the grocery store fwiw.

Getting as much as possible from real food tends to be preferred.