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StableGI is a safe and effective probiotic. Just 2 capsules a day provide all that you need for probiotic use. StableGI brand of Lyophilizied Saccharomyces boulardii is a probiotic yeast designed to support your natural digestive balance. StableGI will support your gastrointestional balance from disruption by the stress of everyday life. Saccharomyces boulardii is a well researched and clinically significant probiotic. Worldwide Saccharomyces boulardii has been used for over 50 years. Most probiotics are beneficial bacteria, StableGI is a beneficial yeast. Unlike bacteria, yeasts are naturally resistant to stomach acids and bile salts. These two digestive substances rapidly breakdown bacterial probiotics. This natural resistance allows StableGI to reach the large intestine in significant concentrations where it can have the greatest effect.