Read some of the Google results for magnesium + Crohns.
I have severe IBS and increased my daily vitamin intake of magnesium. The discomfort did not stop, but it subsided drastically.
Many in the IBD/IBC forums are hailing magnesium as a miracle.
It is available OTC at most heath food locations. Types of magnesium vary somewhat, so do some additional reading on that.
>> I have severe IBS and increased my daily vitamin intake of magnesium.
Both magnesium and B12 loss can occur over time leading to peripheral neuropathy among other things.