I have read that native Americans were partial to sharing a fresh pile of buffalo poop to "lift their spirits". I myself have eaten worm castings (lol) and even tried bio-dynamic cow dung, which is organic cow dung from animals with horns, which is compacted into a cow horn and buried over winter to ferment and take in "earth forces". bio-dynamic cow manure is known for its fresh, sweet smell. The preparation is used, 1 teaspoon in water, to "enliven" an acre of growing earth...really made me emotional but felt better afterwards...but too strong after a few days, same as the worm casting, the strength was surprisingly more than I could ground.
One thing you are getting is colloids I think (apparently its colloids that make cow dung an excellent building material that actually protects from radiation). Also, from something I heard on youtube, 95% of your seratonin (master gland juice), is synthesised and stored in the gut mucus membrane,, and stools too id guess.
The reports on faecal transplants reminded me of hearing about a fellow "sufferer" (M.E.) who had been given a blood transfusion following the birth of her son. She reported a huge boost in health following what should have been an ordeal. Having nearly recovered a couple of times, one thing I would notice was that my saliva would start to "melt" food again. That was another way mothers, and animals, used to pass on immunity; chewing food and passing it to the baby's mouth.
I reckon if a healthy person chewed your food for you, yeah gross again I know, and you swallowed that food, then you might notice some healing affects thereof. I wonder also if its possible to hook up with someone else, blood supply wise, so that over the course of a day all of your blood would get filtered, oxygenated and cleaned by them. My guess, if it were possible, is that they'd get what would feel like a bout of flu (the "healthy person that is and maybe the ill one too)...could be too much too fast.
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There's something in this type of treatment and personally, I think, blood transfusion is the way to go (if it transpired to be as least as good as faecal). Not that it would work for everyone I don't think. I saw in the film "Dallas Buyers Club" with Matthew McConnaughey(?), that the aids sufferers in it (actors) were often given blood transfusions to give them a boost in health. And of course blood doping in Tour de France for a boost in performance.