As a sufferer of candida ill break it to you straight there are about 3 success stores out of million that might be abit sad but to tell you the truth alot like myself spend thousands on supplements, follow rigid nutrient restricted diets that are almost unbearable and get little to nowhere.
The answer i dont know, some are easy if its heavy metal toxicity then chelate these metals but for others who have primary plus secondary parasitical infections what hope is there.
Either way very nice of you as a therapist doing some research most would just dimiss the client as a wacko so kudos to you my friend:)
But there are too many theorys and too much disinformation on the whole.