Vegan Jarro-Dophilus Plus FOs with six clinically studied strains is a high-potency, gluten-free formulation that survives stomach acid. Each capsule contains 6 species combination of the Lactobacilli and Bifidobacteria at a potency of approximately 3.4 billion organisms. The formula also includes 210 mg of FOS, which are natural carbohydrates that enhance replication of beneficial bacteria. Keep in the refrigerator.