I just take the K2 included in the bone support supplement. I don't know much about the differences so hope this does the trick. I tried reading some studies on them and my eyes glazed over in boredom so just trust the manufacturer, lol.

windyshores search on "Dr. Weston Price Activator X" for answers to that question. For bone health look into boron, magnesium and annatto tocotrienol. In addition to bone benefits they add needed supplementation for deficiencies resulting in a many other health issues. "Nothing boring about boron" is worth the search.