There are eight PubMed studies on this strain.
- Significantly changes the size and composition of the circulating bile acid 
- a greater proportion of L. reuteri-treated subjects showed improved general GI health status (p = 0.042) and improved diarrhea symptoms (p = 0.03). 
- the first report of increased circulating 25-hydroxyvitamin D in response to oral probiotic supplementation
For general information about L.Reuteri see my earlier post.
Available from manufacturer and on Amazon.
This stain is also sold as Cardioviva on amazon
I have just ordered some myself.