A neurosurgeon friend and my PCP, endocrinologist and female cardiologist (who was s college gymnast and reed thin so worries about some future osteoporosis all recommend vitamin K2. Aside from some other benefits, my cardiologist takes it (and put me on it) because there are several studies showing that it helps prevent free-circulating calcium from building up in arteries. I don't know if K2 would be as important if one's calcium came only from food sources, with no calcium supplements though. I take calcium so also take the D3 and K2 and magnesium, potassium and silica...hopefully in some vaguely intelligent overall balance ;-).

Whether recommended or not there is sufficient evidence to suggest it is a bone healthy vitamin. You cannot rely solely on a doctor’s advice; my doctor didn’t even know enough about it to have an intelligent conversation about it … a vitamin!