A small number of possible ones are reported in the literature, but the quality of the results are suspect.

Tax Rank	Tax Name	Shift	Citation Link
genus	Enterococcus (NCBI:1350 )	High	📚 PubMed
genus	Klebsiella (NCBI:570 )	High	📚 PubMed
genus	Prevotella (NCBI:838 )	High	📚 PubMed
genus	Salmonella (NCBI:590 )	High	📚 PubMed
genus	Staphylococcus (NCBI:1279 )	High	📚 PubMed
genus	Streptococcus (NCBI:1301 )	High	📚 PubMed
phylum	Firmicutes (NCBI:1239 )	Low	📚 PubMed
species	Acinetobacter baumannii (NCBI:470 )	High	📚 PubMed
species	Bifidobacterium longum (NCBI:216816 )	Low	📚 PubMed
species	Enterococcus faecalis (NCBI:1351 )	High	📚 PubMed
species	Enterococcus faecalis (NCBI:1351 )	Low
species	Enterococcus faecium (NCBI:1352 )	High	📚 PubMed
species	Escherichia coli (NCBI:562 )	High	📚 PubMed
species	Escherichia coli (NCBI:562 )	High
species	Klebsiella pneumoniae (NCBI:573 )	High	📚 PubMed
species	Methanobrevibacter smithii (NCBI:2173 )	High	📚 PubMed
species	Methanobrevibacter smithii (NCBI:2173 )	High
species	Pseudomonas aeruginosa (NCBI:287 )	High	📚 PubMed

The usual method of testing is from breath tests. From KEGG.JP we can get a list of bacteria that produces the compounds detected in the breath — the number is huge.

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Question: How do you search on Microbiome Prescription for H2 etc?

On My Own Sample