Started taking one last night along & again this morning as well as one for our oldest child. Think it's already working to help with the season flu/cold that we get around here. I've had issues lately with that along with possibly overgrowth of yeast in the stomach (triggered by a Krispy Kreme doughnut last week). Had originally contacted the company some time ago about the composition of the probiotic & they wrote back to share the following. S. thermophilus = 22bil, Lb delbrueckii ssp. bulgaricus = 8.5bil, Lb acidophilus = 22bil, Bifidobacteria ssp = 1mil.. I did take this along with Jarrow Formulas, Saccharomyces Boulardii plus Enzymatic Therapy, DigestRight, so the combination may be even more beneficial for my situation.