Several people on this forum to whom I sent the below doc asked me to post it publicly - so here it is. It's actually three docs in one: 1. I recently dug up the studies on which probiotics have worked against illnesses that affect me & many of the people I know. The studies - which I've put in a table searchable by illness - are of varying quality: in vitro, mice, humans, uncontrolled, controlled, etc. 2. I also wrote to yogurt manufacturers (& a few makers of sauerkraut & probiotic supplements) & asked them which species they use. From the replies I made a second list: which cultures are in which brands. 3. I added a third table at the end, which contains the same info as the first, but is searchable by brand. It's a pdf, as this site won't allow me to upload Word. I can email a Word version (in which cites are live links) to anyone who wants it. Some personal observations: The research was useful to me, as it showed me that L. rhamnosus has proven effectual in just about every gut condition; I thus used it to transition (quite quickly) from the low-FODMAP diet back to normal foods - which I'd been hitherto unable to do. I used several other species as well, as variety seems to be key. (My mood also became calmer. I'm pretty sure that, as @stridor puts it, the future of psychiatry is in the gut.) Most of the yogurts were bought in Australia & a few in SE Asia; tho many or most are sold internationally. I tend not to eat commercial yogurts, as I don't trust their bacterial counts ("CFUs") & I don't like dairy: instead I used them as cultures to make coconut cream yogurt. (Only two brands produced a good yogurt BTW.) After a month or so I'd fixed my gut & improved my mood, but began to get thumping headaches & fatigue, which I realised was histamine OD. So I have stopped the yogurts now - they did their job - & am focussing on a range of prebiotics (recommended by @alicec & others), so I can support my own microbiome rather than always supplementing it exogenously. I don't know why the yogurts caused such histamine problems, when repairing the gut (which I largely did) is supposed to prevent that. I might try those species & strains which degrade histamine rather than generate it, when time permits. Most people hopefully won't get histamine problems, so my research may be of some use.