I found DGL licorice to be very helpful for stomcach issues - the literature says it cures ulcers, which i believe I had before taking it. The pains were horrendous.
In addition, I asked my dr if he thought I might have leaky gut. He responded that it was possible, but the licorice probably healed it, given my description.
Perhaps it can help someone else. Slippery elm didn't heal, but gave temporary relief.