Experience and Opinions on Gut Directed Hypnotherapy

Gut directed hypnotherapy for conditions like IBS and functional dyspepsia are supposedly very effective for these health issues. What have been your experiences having or delivering gut directed hypnotherapy ?

Here is a scientific article for those who aren't familiar: https://pubmed.ncbi.nlm.nih.gov/34718171/

I'm new to hypnosis so any information is helpful.