filler question

Thanks so much for posting this. I'll be ordering the ingredients to try, but I was wondering - is there any reason to have a filler, rice bran or otherwise?
Also, do you have any suggestions for the proportions of ingredients by volume?
Like 1/3 cup manapol with 1/4 cup arabinogalactan etc.? Would the dosage vary from Ambrotoses 1/4 tsp, especially if you left out the filler? I'm doing this for my Dad (just been diagnosed with mucous-membrane pemphigoid, an auto-immune disease of the mouth) and I want to be pretty specific about the directions.
Thanks again.
- Laura Tweet