Scientists have identified hundreds of beneficial probiotic bacteria, but only two strains of probiotic yeast. These yeasts hold one powerful advantage over probiotic bacteria—they've been demonstrated to be more resistant to stomach acid and much more vigorous in colonizing the lower GI tract. One of these yeasts, a proprietary strain isolated by French researchers and registered with the French National Collection of Microorganisms Cultures as Saccharomyces cerevisiae CNCM I-3956, is now available in America as Lynside Pro GI+, the active ingredient in Swanson Probiotics Inner Bowel Support Formula. This patent-pending strain of probiotic yeast has been shown in clinical trials to provide specific benefits for the lower GI tract. Our vegetarian capsules make it even more effective with acid-resistant, designed-release DRcaps® technology, which protects the capsule through the stomach for release in the lower GI tract. With 4 billion viable organisms per capsule, it's a reliable alternative for optimal bowel health and comfort.