QUOTE(The Lovebug @ Jun 20 2007, 07:36 AM)

I just started taking probiotics but had a reaction to them. I emailed the people at drlark.com to ask about gluten and here is the response I received:
This product contains no added sugar (sucrose, fructose, lactose), salt
(sodium chloride), yeast, wheat, gluten or milk. There are also no
preservatives, artificial colors or artificial flavors.
They do contain soy, however, and I'm beginning to think that's the source of my trouble.
I ordered some probiotics called Natrol Free (claiming to be free of any allergens) and will see if they work.
Yay! Someone else who reacted to probiotics (now I don't feel so alone!

) I also had the exact same issue. The product was "gluten and casein free". I was sick for a week, but only had my GI issues and not my full "typical" gluten reaction response.
There is little information on the subject from what I know. I do know that in some cases people CAN react negatively to probiotics (although this is presumably uncommon and you never hear about the side effects). This probably has to do with the sudden shifting of the "good" to "bad" bacteria ratio in the gut. Perhaps those who react negatively have a markedly abnormal ratio (presumably more bad than good)?
Either way, I was sick as a dog, and although I believe that probiotics play a huge role in benefiting those with autoimmune diseases and/or intolerances, I just can't bring myself to try them again. I would love to though!
Let me know how this round goes for you!