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“Excess vitamin d reduces vitamin k. You only need more vitamin k if you take excess vitamin d.”

While it is true that taking excessive amounts of D will increase the need for K, it is not definitely proven that excessive D actually reduces the levels of K (though some believe that it does, to be fair in this discussion).

What D does is to increase your absorption of calcium from the food that you eat (and, as I pointed out in Post #45, magnesium helps D to do its job). Too much calcium in your body can cause nausea, digestive issues and making hardening of the arteries more likely (or cause it sooner than otherwise). What K does is to help regulate where in your body (bones and teeth vs. the bloodstream) the calcium goes, so if you have a lot of extra calcium in your system because you are taking a lot of D, then you probably need more K (i.e. the K already in your system isn’t destroyed by the D, it is merely used up more rapidly because more is needed).

Please see the references that I cited in Post #45 for more detailed (and reliable) information about these topics than I can provide (because I am not a doctor or biochemist, and the sources cited in the articles in that post were conducted by people who have the requisite qualifications).

While it is true that taking excessive amounts of D will increase the need for K, it is not definitely proven that excessive D actually reduces the levels of K

Researchers gave 30 micrograms of vitamin D to people. They report:

"In a sensitivity analysis, in which we excluded vitamin K antagonist and multivitamin users, the difference in dp-ucMGP concentrations between the vitamin D supplement group and the placebo group was significant. This may imply that vitamin D supplementation affects vitamin K status.

This is the first study to investigate the effect of vitamin D supplementation on dp-ucMGP concentrations, the vascular marker of vitamin K deficiency."

Article DOI: 10.3390/nu11020231

While it is true that taking excessive amounts of D will increase the need for K, it is not definitely proven that excessive D actually reduces the levels of K

I forgot to mention that taking excess vitamin D also reduces gamma tocopherol. People who claim very high doses are needed to take a toxic amount don’t even look at whether it changes the blood level of gamma tocopherol.