This probiotic supplement from Nature's Way, Primadophilus Bifidus, is a once-daily, delayed-release formula designed to support healthy digestive flora. It features a 4-strain formula providing 5 billion CFU per serving, including Bifidobacteria and Lactobacilli strains. The True Potencyâ„¢ guarantee ensures potency through the expiration date. The delayed-release capsules are designed to resist stomach acid. For optimal potency, it is recommended to keep the product refrigerated. Suggested Use: Take 1 capsule daily. Other Ingredients: Potato starch, plant-derived capsule. Contents are packaged in a way to protect its potency.