Bene-Bac Powder is a concentrated live culture of four common digestive bacteria found in the intestinal tracts of mammals. Recommended any time an animal experiences stress from changing nutritional or environmental conditions. Contains 20 million CFU per gram of viable lactic acid producing bacteria. This product should be used on animals who are or have been on antibiotics or who have diarrhea. This product does not stop diarrhea but is intended to replace good bacteria in the digestive system that is lost during their illness.