See the ´Nature Article Uses ME/CFS to Examine the Microgenderome´ in ´Latest ME/CFS research. If you are feeling generous, you can tell us how you voted and which probiotics you took.
I have tried three probiotics so far, VSL3, Mutaflor, and Custom Probiotic´s 5 strain Bifido, and they have all had a negative effect on my condition, giving me more pain/aches, a sore throat, looser stools, and more tiredness/general malaise.
I don´t know how unusual it is, but all the stories I can think of people getting worse are from males. I should have added a ´some good, some bad´ option.
I had zero effects from yoghurt and taking probiotics. Fermented foods make a difference for me. I would agree with it says in that link, "the bacteria in milk kefir, on the other hand, can actually colonize the intestinal tract. Kefir also contains a far larger range of bacteria, in addition to containing yeasts".
It's been over 30 years, but, I don't think I had a great healing feeling. It may have deterred fungal infections. I used to have athlete's foot, and nail problems.
I did vote negative and I am a female. I've tried 5 different kinds and had serious issues with each attempt.
But I think the question is probably moot. Because honestly?
I think it helps if it's what you need
It's harmful if it's the LAST thing your body needs and triggers problems
No impact just means that you didn't need it and it didn't worsen your condition
Until we know how to diagnose the ROOT problems, it's just another shot in the dark and it's likely to help some, harm others and leave others scratching their heads as it doesn't seem to matter.