List of source of strains:

EDIT: here's a project with a list of strains that /u/markus_naslund has started: https://old.reddit.com/r/HumanMicrobiome/comments/aceyab/commercially_available_probiotic_strain_database/

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You can PM me for additions so I can keep this updated. If google will not tell you the source you'll have to contact the company and ask. The vast majority are food-sourced so it might be easier to just keep a list of human-sourced.

We have to keep in mind that there is a difference between strains sourced from human stool (which may be transient environmental microbes) and strains sourced from the intestinal wall (which are more likely to be host native). Then we have to keep in mind that not every human-sourced probiotic will be beneficial, or significantly so. Which is why I primarily focus on FMT, and wait till there are proven benefits for new/old strains and simply list the main ones here.

Human-sourced:

• Culturelle (L.GG): https://en.wikipedia.org/wiki/Lactobacillus_rhamnosus#Lactobacillus_rhamnosus_GG_.28ATCC_53103.29

• Align (b.infantis 35624): http://www.bifantis.com/pdf/Monograph.pdf

• BioGaia Gastrus: https://www.biogaia.com/research/biogaia-probiotic-strains/

• B. longum BB536: http://maypro.com/products/morinaga-bb536 - http://www.morinu.com/en/b-longumbb536/

• Lactobacillus gasseri CP2305: https://archive.is/BLZzv

• Lactobacillus plantarum 299v: https://www.fda.gov/downloads/Food/IngredientsPackagingLabeling/GRAS/NoticeInventory/ucm544492.pdf - http://www.jarrow.com/articles/release/id/417/Lactobacillus_Plantarum_299v,_Natural_Solutions_to_GI_Problems

• Mutaflor E.Coli Nissle 1917: http://www.probiotics-help.com/mutaflor.html - https://archive.is/jrie0

• Super Human Probiotics - claims to have 15 human-sourced strains + 4 food sourced: https://elementalwizdom.com/products/super-human-probiotics

• AOR Probiotic 3: Under their "label info" tab they say 2 out of 3 are human-sourced: http://www.aor.ca/en/product/PROBIOTIC-3

Food-sourced:

• VSL#3: https://vsl3.com/faq/ - from what I can tell, the only thing unique about this product is the high CFU count. The strains weren't even identified/studied till 02/2018: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0192452

• Most/all Garden Of Life products: See the label.

Unknown source:

Reuteri pearls: https://archive.is/luQNi