Hydrogen Sulfide
Different bacteria in the intestinal tract digest different kinds of carbohydrates. Some make more methane, others help hydrogen to combine with sulfur (from other foods or water) to make hydrogen sulfide. Hydrogen sulfide is the smelly flatus.
A small amount of hydrogen sulfide is produced by bacteria in your mouth and gastrointestinal tract and by enzymes in your brain and muscle.
References:
ATSDR- Agency for Toxic Substances and Disease Registry
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