I started running last September a lot. I eventually developed a stress fracture in my left shin. Saw a doc and she put a boot on my leg, I rested it and it healed completely. I started running again, working my distance and speed up gradually, but than my right knee started killing. It hurt so much I could barely walk up and down stairs. I saw the doctor and he said it was a problem with my cartilage. He gave me rehab and that helped a lot. I ran for a little with no pain, then it came back. Both shins started killing and now my knee is hurting again. My form is good and I made sure I bought good running shoes (they cost $120 and fit my feet and arch perfectly). Yet I still continue to have constant running problems. I need to be able to run for my career (Army) and I keep having set backs. Any suggestions on what I can do to stop these injuries or supplements that could help?