@Vegas ;
I've been looking for causes of some of these symptoms I've been having as well as others here.
Many folks here have one or another type of IBS.
A noticable amount of people have had negative reactions to various probiotics. I don't doubt that the over production of d-lactate is involved. There could also be a shortage of lactate utilizing bacteria.
I just wonder if there are more possible causes to the painful reactions we're having when trying various probiotics.
Excess hydrogen is one, I think, because it can reduce the pH of the colon, and stop butyrate production, along with stopping other microbes' growth.( pathogenic and beneficial) We lose energy this way.
I've been reading about hydrogenotrophs, bacteria that utilize hydrogen, but, they include SRBs, methanogens, and, acetogens. As you've written, SRBs can be toxic. Methanogens are associated with diseases. Acetogens seem like they could be beneficial for producing energy, ATP. ( That's what we're looking for !)
These bacteria compete with each other for hydrogen, and usually the SRBs or methanogens win. We lose the energy that the hydrogen could provide.
Since there are so few biomarkers for ME/CFS, comparing symptoms and reactions to supplements, drugs, etc. is what we have for now.
I do believe the gut is the place to look for causes in ME/CFS, and diseases in general. I mean, just look at the powerful reactions to CB folks are having!
I think it's not only which bacteria that are needed or not, but proportions as well.
Maybe folks who are having trouble with CB could try reducing other gut microbes first ?