Since you are having problems with rapid transit...food moving through you very quickly and containing undigested food....you should definitely avoid the product that you mentioned, as well as anything that contains cascara sagrada, aloe vera leaf (cape aloes) or senna. These are all herbal laxatives and will make the problem worse. Actually, they should be avoided by everyone as they can create more problems than they solve...but they should definitely not be used by anyone with diarrhea, loose stools, rapid transit time or undigested food in their stool.