Hydrogen sulfide small intestinal bacterial overgrowth — increasingly reclassified by leading gastroenterologists as Intestinal Sulfide Overproduction (ISO) — represents one of the most clinically challenging and underdiagnosed subtypes of gut dysbiosis. Unlike hydrogen-dominant SIBO (associated primarily with diarrhea) or methane-dominant SIBO/IMO (associated with constipation), ISO results from the unchecked proliferation of sulfate-reducing bacteria (SRBs) in the small intestine, producing hydrogen sulfide (H₂S) gas in pathological quantities. For decades, standard three-gas breath testing only measured hydrogen and methane, leaving ISO systematically invisible. The advent of the TrioSmart™ breath test (Gemelli Labs) — the first commercially available test to measure all three SIBO gases simultaneously — has finally given clinicians a diagnostic window into this condition. Even so, many patients with textbook ISO symptoms go years without a diagnosis, and formal treatment guidelines remain absent. This article synthesizes the current evidence base — including data presented at Digestive Disease Week (DDW) 2025 — to provide clinicians and informed patients with a practical, evidence-stratified approach to treating ISO/H₂S SIBO.

Hi! I've asked a bit about LDN and TBIs. New question: how can I explain that gabapentin is causing further damage when already experiencing symptoms of dementia at 40.. and how LDN will differ. Could starting LDN help sometime get off gabapentin? The main reason for that Rx is to help with sleep. Thank you!

Root Cause Analysis is used in Toyota and other high functioning organizations. We ought to use same concept to healing.