I just buy a basic calcium supplement that also contains magnesium. I buy it at my HFS, and I think it's Country Life brand or something like that. I just make sure it's vegetarian and doesn't contain lactose or anything. Other than that, it really doesn't matter! I think my multi has ~600 mg of calcium, so I take another 500 mg via supplement. I can't remember how much magnesium is in the supplement. I do know that I have to take a pretty high daily dosage of magnesium in order to maintain regularity, though.
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Lisa, IBS-C (Vegan)
Stable since July 2007!
Mommy to Rhiannon Marie (Dec. 13, 2008)