Yes, this has been discussed here before, and I think the consensus was that it did no harm but didn't do any good, either.
Not too terribly long ago we had a link here where everyone posted their number 1 most important supplement that they take (this would not include prescriptions, of course). I believe the answer was overwhelmingly their probiotics...
Mother to 16 year old boy diagnosed in June, 2007.
Currently taking Asacol, omega 3s, digestive enzymes, probiotics, iron, vit. C, calcium w/D3 and a good multivitamin.
Started The Maker's Diet in early September.