Bone bridge,, odd concept, taking bone from your hip and placing it between the two cut ends of the fibula and tibia, bones in the lower leg... yes, Bernard Jensen. Yes I think it did supply ca. to the bone healing area. Mg. is absent mostly in milk, baby cows get it in the grass they eat, springtime green. I would def. add a mg. supplement of some sort. I enjoyed making a kefir salad dressing, basically kefir with garlic, a good cup or more poured over a big green salad ( greens having mg. ) seemed to digest well, especially with fully kefired milk.