Note that K2 is recommended along with D to make sure the D doesn’t have a negative effect of calcium levels. K2 supports good calcium levels.
Excess vitamin d reduces vitamin k. You only need more vitamin k if you take excess vitamin d.
Taking 30 micrograms of vitamin d per day is enough to reduce vitamin k in many people.
Many publications tested whether increasing vitamin D in people with a level between 20 ng/ml and 30 ng/ml would produce a specific benefit. Almost always, it does not benefit.
“Many publications tested whether increasing vitamin D in people with a level between 20 ng/ml and 30 ng/ml would produce a specific benefit. Almost always, it does not benefit.”
Perhaps they’re right, but there are mountains of anecdotal reports to the contrary (including many in this thread) - as well as the conflicting opinions of some physicians and Vitamin D researchers.
“Excess vitamin d reduces vitamin k. You only need more vitamin k if you take excess vitamin d.”
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).