Here (below) is a quote from the article, on the subject of calcium. (I suppose some of us may be reluctant or unable to have calcium levels monitored. But it seems all of us should be taking vitamin K2 along with our vitamin D.)
>The authors
explicitly point out that each vitamin D supplementation must be accompanied by
sufficient vitamin K2. This certainly prevents the rise of the calcium level in the blood,
which is often seen as a risk for the supply of vitamin D
Vitamin K2 does help bones absorb calcium, but it will not prevent the blood calcium level from rising if you are really taking more Vitamin D than you need. This is simply wishful thinking.
A vitamin K deficiency with normal vitamin D levels would cause blood calcium levels to rise. Many people are deficient in vitamin K since it's mostly found in leafy greens and liver, no one's favourite foods. The difficulty is judging what is a normal vitamin D level by incidence of people with elevated calcium levels in the blood without having tested all of those people for vitamin K deficiency first.
>The authors explicitly point out that each vitamin D supplementation must be accompanied by sufficient vitamin K2. This certainly prevents the rise of the calcium level in the blood, which is often seen as a risk for the supply of vitamin D