My son has used Theralac now for a year. You can read about
it by putting .com after the name. He also used VSL#3 after a course of antibiotics (for bronchial infection) back in March. He said he REALLY noticed VSL cutting his bm's in half--from 3 a day to 1 or 2. VSL is the strongest with 250 billion cfu's per capsule. Theralac has something like 25 billion. Does he think it has helped? Yes!
I read somewhere that a good probiotic should have somewhere between 15-20 billion cfu's or you are wasting your money....who knows... Can't remember where I read that, but they were explaining since our gut has literally trillions of bacteria, that anything less is a drop in the bucket.
And just for comparison's sake, the SCD legal yogurt has a purported 700 billion cfu's in each cup.
Hope this helps!