Our unique probiotic blend contains Lactobacillus acidophilus, Bifidobacterium bifidum and Enterococcus faecium to promote healthy digestion, prevent gas and bloating and maintain regularity. Even if you don’t suffer from diarrhea, constipation, gas or bloating, maintaining a healthy digestive system is important. These good bacteria strains promote healthy intestinal micro flora for essential immune support and overall health. The intestines comprise the largest organ in the immune system, First Defense Probiotic Supplement can help restore the natural balance of good bacteria in the digestive tract to support a healthy immune system. Unlike other probiotics, each capsule of First Defense Probiotic Supplement contains 15 billion live organisms at time of manufacture.