Have you tried glutamine? My coach last year had me taking 2g every 2 hours, just because of the benefits it has to gut health, even though I personally don’t have those issues.
I just did a Google search on glutamine benefits, and here’s a quick excerpt:
"L-glutamine is the most plentiful amino acid in the body and supports intestinal health. L-glutamine may work for those with IBS because of this role.
The tissues found in the intestine use L-glutamine as a fuel source to function at their best. L-glutamine is also thought to help maintain proper barriers within the intestine.
It is possible that some cases of IBS occur due to an L-glutamine deficiency, and those who increase their intake of L-glutamine may notice a reduction or disappearance of their symptoms."
Sorry for not having a research study cited, but it’s getting late.