I started taking it after suffering what I thought was another fibula stress fracture. X-rays showed there was no fracture, but the pain persisted nearly every time I tried to run.

After a couple of weeks on the GC, the pain went away and hasn't come back (the pain had been with me for 3 months prior to that).

YMMV, of course.

And, AFAIK, I don't have arthritis.