It's an effective part of treating IBS, SIBO, etc. For most, including myself, additional treatments are needed.
I no longer have the tremendous, painful gas as in the past. There would also be worsened insomnia, anxiety, neuropathy, brain fog, etc.
Certain FODMAPs may be more tolerable or not to individuals.
Polyols, or sugar alcohols are the most gut busting to me. These sweeteners are in so many foods and supplements.
Reducing them has helped, but, I still take B12 sublinguals, sweetened with mannitol.
Some improvements can be seen with in a week, but usually it takes some months if there is mucosal damage, in my experience.