Thanks for your reply.
I have heard that reuteri strain is so powerful that only 100 million a day are needed to have a better digestion. It is patented by some Swedish company called Biogaia. But I needed to hear from real people if it's working. Here is Canada, we do not see very wide variety of probiotic strains unfortunately.
BTW, where can I find the strains which u mentioned.
Bifidus regularus (a strain patented by Dannon)
Lactobacillus GC ( sold as Culturelle)
BTW, the last strain is GC or GG. I have heard of Lactobacillus GG (LGG) which is also very effective. But in Canadian market its hard to find them :( Not a very strong probiotic market out here.