The author explains perfectly why calcium is a paradox for the health, and why the Vitamin K2 should be in every collection Supplement actually, in the also the calcium has a place. I highly recommend this book highly laymen and physicians. It includes at the end of 27 pages of footnotes, in which they called scientific articles, which deal in detail with the important issues. A meeting word register is not missing. Probably the best overall book on vitamin K2!