It helps to give them some PABA along with the prebiotic. They use it as a kind of starter fuel from which they can make other B vitamins.
PABA - para amino benzoic acid - find it with the B vits at the HF store.
Once a good colony is established and well fed in the gut, then they will make their own PABA.
Re prebiotics for humans. I have not studied the research on which work for whom in humans - if such research has even been done properly - , and suggest looking at the blood type diets as a start but just experiment with what works. My main work area is animals - so I have studied the ones for dogs and the ones for cats, both having been researched - and which by the way are vastly different. What is good for dogs can be useless to cats - or bad for different reasons. For example lactulose is used by dogs but it is OVERused - produces too much fermentation and that rushes the gut contents through too fast, losing nutrients. Lactulose for cats is cruel - it does not work for ther bacteria for fatty acid production at all - but it will produce large quantities of very painful gas. (Yet vets will prescribe lactulose for ALL species coming their way with gut issues, and wonder why they do not get right......)
Same in people - one substrate will make gas, another will do nothing or diarrhea or constipation - it's a balancing act to find the right one (and the right amount, though the amount is less critical than first finding the one that works optimally). I came across chia in my case quite by accident - wanted to know what all the fuss was about concerning chia - and tried it

Namaste,
Irene
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Irene de Villiers, B.Sc AASCA MCSSA D.I.Hom/D.Vet.Hom.
P.O. Box 4703 Spokane WA 99220.
www.angelfire.com/fl/furryboots/clickhere.html (Veterinary Homeopath.)
"Man who say it cannot be done should not interrupt one doing it."