So it is not a supplement other than that? What of those who have persistent IBS regardless of use of fiber and other non-drug aids? Didn't you post something about creatine?
Take a look through this:
https://freerepublic.com/tag/ibd/index?tab=articles
I would suggest supplementing with 5 mg a day, but the Upper Tolerable Limit is 11 mg a day. We do get some from food.
My wife and I get over 30 grams of soluble fiber a day, primarily from newer keto bread options. We do add psyllium on top, as well.
I would also encourage considering a fast mimicking diet for five days, three months in a row.
I had to take some strong antibiotics about two years ago and was left with large intestinal pains. They have only recently basically gone. I did these things and also took probiotics. It would be similar for IBD, as you will note from the keyword search.
Daniel, I apologize, as I responded for IBD and not IBS.
Here is a listing of articles tied to IBS:
https://freerepublic.com/tag/ibs/index?tab=articles
This is a keyword search at Medical Xpress for IBS:
https://medicalxpress.com/search/?search=Ibs
There are up to around 12 articles a month for IBS. You can scan the titles pretty quickly for what matters. I would open up a separate window to not lose your position in the list.
I hope these can help, sir.