I don't know for sure, but I think some people use 2 fibers out of habit (they were switching from one to the other, for example, felt good on the combination and decided to stick with it), or because one is more convenient than the other (pills vs powders). All fiber supplements work the same way in the system, so it's just a matter of finding the one you like... and if more than one works, super!
I know the Acacia doesn't work for some, but in those cases, you typically stop taking it altogether and go with a different supplement. (As is the case with any other brand, too... I had trouble with Citrucel, for example.)
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