I was shocked to learn that probiotics are not regulated and we have no idea what Is in them or what were ingesting.
Since I must watch everything I ingest, could be a reason why they don't work for me.
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Why does that shock you? None of our supplements are regulated, thanks to the nutraceutical act. The only time they are removed is when there is evidence that proves they are harmful. This is why it is so important to get your supplements (of any type) from a reputable manufacturer. Chinese herbs are known to potentially contain harmful additives. More common is that the product does not contain what it claims to. Not harmful, but an expensive placebo! Buyer beware.
This does not mean they are all garbage. There are many reliable manufacturers with excellent quality control.
Jan 
I like to say you're ahead of the game if a supplement doesn't kill you.
Check out consumerlab.com. third party independent tester. It is a subscription service but worth it in my book...
Your best bet is probably VSL#3. It has some research behind it and is available by prescription. I've been a guinea pig and wasted money on numerous brands that did nothing. Even VSL didn't work the first time years ago, not until I tried the newer double strength version.