I am really not sure about this as I have never been real consistent with taking it. I never taker metamucil other than wafers and honestly never saw much change with thickening even using them. I know others have better luck with metamucil than I have. I know others take benefiber (do a find) it is much easier to tolerate than metamucil is for me at least.
I didn't have much luck with metamucil - gave me too much gas. I did try benefiber and while it didn't give me any negative side effects, I never noticed any difference in output or stool consistency one way or another, so I after a while I didn't bother with it.
I still prefer foods for thickening. These days I really like applesauce as a thickener. I wish I had discovered it sooner. Rice and oatmeal also work great for me, and I've also noticed that when I eat the rice crisps/chips from Riceworks, those seem to slow things up as well. They're gluten-free as well so they should be fine if gluten is something you're trying to avoid. And, if you want to get really creative, some people like marshmallows though I can't say I've had much experience with them either way.
The people in my CCFA support group swear by rice crispies treats as a good thickening agent, although they have a lot of sugar. Naturally processed peanut butter and bananas also could help.
As far as Fiber Supplements, Metamucil wafers should be tried in lieu of powder, they work well as a thickening agent. Inulin based fiber supplements may also work, but some people complain it gives them virulent gas.
Basically you must engage in trial and error and see what works best for you. For me it is metamucil, bananas, peanut butter and oatmeal as mentioned by Spooky, but the old fashioned kind not the processed junk with sugar.
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