I don't understand why K2 is not more popular. We've known for years (over a decade?) about its potential benefits, yet there is still not enough clinical evidence to warrant its use. Wouldn't it be easy to give women vitamin K2 in addition to calcium and vitamin D, and see what happens? It seems like it'd be easy to recruit patients for such a simple trial. Lots of people are already supplementing, however, badly worded and outdated Health Canada laws make it difficult to obtain K2 in Canada (due to a legitimate limit on K1 dosage affecting all forms of K).