Histamine Well Podcast: Exploring Histamine, Methylation & Holistic Health · Joanne Kennedy

30. Hydrogen Sulfide SIBO Explained: Symptoms, Testing & Treatments with Rosaria Nithart

·39 min·2 clips

Rosaria links oxalates, SAT1, and sulfur depletion to a compensatory rise in hydrogen sulfide-producing bacteria.

1. Histamine Well Podcast episode 30 centers on hydrogen sulfide SIBO, which Joanne Kennedy also calls intestinal sulfide overproduction, or ISO. 2. Joanne Kennedy hosts the show as a naturopath, author, and educator, and Rosaria Nehart joins as a French-based naturopath and SIBO specialist. 3. The episode asks how hydrogen sulfide SIBO differs from hydrogen and methane patterns, how it is tested, and how treatment changes when oxalates and sulfur metabolism are involved. 4. Rosaria says hydrogen sulfide SIBO is harder to identify because only a handful of labs can test for it and the gas is unstable. 5. She names TrioSmart in the United States, Nordic Labs in Europe, and a UK option she thinks may be InVivo with the Gemelli test. 6. Rosaria says she often relies on clinical presentation and microbiome analysis when breath testing is unavailable or expensive. 7. She describes more diarrhea, urgency, brain fog, poor concentration, muscle and joint pain, skin inflammation, urinary symptoms, and food intolerances. 8. She says the sulfur smell of rotten eggs can appear, but it is not always present in these cases. 9. Rosaria explains that excess hydrogen sulfide can increase inflammation, affect leaky gut, block butyrate absorption, and contribute to fatigue and neurological symptoms. 10. She says hydrogen sulfide can also drive systemic toxicity and mitochondrial dysfunction. 11. Rosaria lists sulfovibrio, bilophila, fusobacterium varium, E. coli, Salmonella, Klebsiella, Clostridia, and some Bacteroides as organisms that can produce hydrogen sulfide. 12. She says these organisms can generate hydrogen sulfide through sulfate pathways and through amino acids such as cysteine, methionine, and taurine. 13. Joanne and Rosaria connect the pattern to high animal protein intake, red meat, N-acetylcysteine, and long-term low-FODMAP dieting. 14. Rosaria says a low-FODMAP diet is not the same as a low-sulfur diet, and she warns that prolonged restriction can push people toward more animal protein and brassica vegetables. 15. Rosaria says oxalates may intersect with sulfur metabolism through the SAT1 transporter and may deplete sulfur while altering bacterial patterns. 16. Joanne says she sees high desulfovibrio alongside symptoms such as UTIs, pain, inflammation, anxiety, insomnia, kidney stones, and mineral deficiencies. 17. Rosaria explains that hydrogen sulfide is processed through the liver sulfation pathway and depends on the SUOX enzyme. 18. She says SUOX depends on molybdenum and iron, and that molybdenum can produce noticeable improvement when sulfide conversion is impaired. 19. The conversation stays practical and clinical, with Joanne prompting examples from patient care and Rosaria answering in a measured interview style. 20. Practitioners, patients with diarrhea, brain fog, and sulfur intolerance, and people who did badly on low-FODMAP or carnivore diets are the best fit for this episode.

As heard by us

A hard-to-test SIBO pattern framed through symptoms, linked pathways, and clinical judgment.

Hydrogen sulfide SIBO comes through here as a pattern that is easier to suspect than to pin down. Joanne Kennedy and Rosaria Nithart connect it to oxalate toxicity and transsulfuration pathway disruption, and the episode keeps its footing in clinical judgment when testing does…

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When sulfur symptoms don't fit the usual SIBO script.

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