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I would add that acidophiles specifically have a good amount of evidence behind them.

Here's a random study about vaginal microbiota:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4178329/

There's also a probiotic called visbiome (formerly* known as vsl #3, which is the name the research literature uses) that has shown a lot of effectiveness for IBS and similar issues. I don't feel like digging up the studies for that unfortunately but there's quite a bit of evidence.

* vsl #3 is still marketed but is supposedly a different manufacturing process now. thus visbiome is now the "real" one