If you're looking to try l.reuteri an alternative to primadophilus is BioGia - The difference being it's live bacteria and not that expensive.
www.biogaia.com/product/biogaia-protectis-dropsI've taken both with what I felt was good results. I tend to lean to the BioGia as it's easy to get at the drugstore here. They keep it in their fridge behind the pharmacy counter.
EDIT: I should have added that I recently stopped all probiotics. Although I felt the reuteri helped initially, after a while I was curious what would happen if I stopped. I actually felt better after stopping. So who knows. Maybe it helped initially though.
Post Edited (Canada Mark) : 12/9/2014 7:00:37 PM (GMT-7)