A specially developed probiotic formula featuring 10 high quality probiotic species, for a total of about 10 Billion CFU (colony forming units) per caplet. This product also features the patented BIO-tractÂ® delivery system that protects the live organisms from gastric acid to ensure their delivery into the intestines. This formula also contains fructo-oligosaccharides (FOS) which are added to provide food for bacterial proliferation. The best part is … No Refrigeration is Required!! Simply keep this product in a cool, dry place for best storage.