Dr. Jason HawrelakDr. Jason HawrelakThe Microbiome Restoration Center · Lead Educator - The Microbiome Restoration Center; Chief Research Officer - The Probiotic Advisor

hydrogen sulphide gas producers for amm

PDF · 15 Jan 2026

Slide deck by Dr Jason A. Hawrelak summarising classic colonic hydrogen sulphide (H2S)–producing bacteria (e.g., Bilophila, Desulfovibrio and other SRB and proteobacteria), health risks associated with elevated H2S (toxicity to colonocytes, links with IBD, CRC, visceral hypersensitivity and neurologic associations), typical "normal" abundance ranges from Microba, and practical approaches to reduce H2S production (dietary changes, herbs, prebiotics/probiotics, zinc, bismuth, CoQ10). The work includes clinical registry data and an extensive reference list.

Questions this document answers

Bilophila spp.; Desulfovibrio spp. and relatives (Desulfobaculum, Desulfocurvus, Desulfotomaculum); Fusobacterium spp.; Proteobacteria such as Klebsiella, Escherichia, Haemophilus, Enterobacter, Proteus, Citrobacter, Yersinia.

Desulfovibrio: 0–0.28%; Bilophila: 0–0.2% (author notes ideal populations of both genera < 0.15%).

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