Sorry to hear you're having ITB problems--that bites!! I hope to never have that issue again (and at least now I know what to do for it if it ever does happen again). As far as the magnesium causing the runs, I am a little concerned about that but got a formulation that is supposed to be well-absorbed which should reduce the chance of that particular problem (hopefully) as well as increase the chance that it will actually help. Plus I am being fairly conservative with the dose (starting with 200 mg at night) and planning to concentrate on increasing my dietary intake rather than just taking a large dose of the supplement. I guess we'll see what happens...