[Chad Cilli]

Originally Posted by Blair Lowe

http://en.wikipedia.org/wiki/Xanthan_gum#Allergies

possible allergen and it is known to have a laxative effect.

Good point, there seems to be xanthan gum in all whey protein products though, so I don't think I'm allergic to it, but maybe APS uses more xanthan gum than other products hence the laxative effect.