@SueDeNimm Im Ah, Ok. I think that’s quite broad.
Some single strain probiotics have clinically proven and targeted effects on specific conditions and symptoms. There is good research evidence for those in particular circumstances.
I’m not a fan of probiotic products containing multiple strains as a general health measure. Not because there is necessarily anything wrong with them, just because it’s difficult to tell whether something is helping or not.
So some strains in the product might be helping, some might be hurting but the effects all get bundled up together.
Things can happen e.g. food poisoning that affect the microbiome and specific probiotics can provide targeted support for those type of events.
When you talk about mood etc, there is a strain that has been shown to regulate serotonin production recently, but I don’t think it’s commercially available yet.
As you mention, there are life changes and choices that promote healthier gut functioning and in the context of a generally healthy life they can make a massive difference.
Jason Hawrelak is a good person to Google if you want to know more about probiotics in general. He runs a service called Probiotic Advisor.