I joined this site to get what I think is really great advice regarding the potency, etc. of different supplements and products. They analyze brands by content and price and note the best bang for the buck. They also study the effectiveness of various products. There is a cost but it’s WELL worth it!
Because of this site I ended up going to Walgreens and Costco - and abandoning some of my previous brands that weren’t as cost effective, etc.
You can find a good pro-biotic here. I did.
Thanks I’ll look into it.