Cellulase and hemicellulase are two of the enzymes contained in Candex, which is one of the most (if not the most) effective things I use for candida. Candex was the thing that finally brought my bowel movements back to normal; without it I'd probably still be at square one.
Also, the pineapple enzyme bromelain isn't produced in the body either, but it worked miracles for my body pain and tendonitis.
For digestion I take "Plant Enzymes" from Now Foods and find that it works fine. I used to take "Super Enzymes" by Now, which contains ox bile and pancreatin, but that stuff is very strong.