vsl3.com is where you can order the non-prescript
ion strength direct. Not cheap however.
If you have insurance that will cover it then VSL#3DS is prescript
ion strength.
There are many other probiotics that different people here take that can be purchased at drug stores and health stores. You might have to try several to find the one that works best for you. I tried one from the drugstore and saw no change. After reading here about
VSL#3 I tried it and it seems beneficial for me.
There is also Florastor, available in drugstores. It is a different pro-biotic. It's a beneficial yeast (other probiotics are beneficial bacterias). Some people take both.
There are positive medical studies on both.
Good luck and thanks for your service.