Doctor Ilizerov who developed the ilizerov spatial frame for non union fractures of the arm, tibia, wrist etc. and whose daughter is currently an orthopedist at HSS in Manhattan, recommended that his patients grind up egg shells for the calcium present in egg shells. My wife had a non union fracture of the tibia for three years until she started to take this type of calcium, she told another patient who's x rays i saw and his tibia was shattered into shards and had not healed in 2 years and his healed. It has also been used successfully on horses that I have am familiar with. its your decision but if the type of calcium you are taking is not doing the job, I dont see what you have to lose, but again of course its up to you.