Cathartic colon is the anatomic and physiologic change in the colon that occurs with chronic use of stimulant laxatives (> 3 times per week for at least 1 year). From the above definition taking a stimulant laxative for two months should not results in a cathartic colon. If in doubt check with your doctor.
Bentonite clay is just that - clay. Bentonite is used in cement, adhesives, ceramic bodies, and cat litter. It contains no nutrients but absorbs water.
IF#1 contains the stimulant laxative senna and aloe which Heather recommends avoiding. IF#2 contains a variety of fibers amongst other things including clay. A simple soluble fiber supplement that does not contain clay might be just as good and soluble fiber supplements are natural and alternative.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS