Saccharomyces boulardii is a friendly yeast. It has a number of different applications but is primarily recommended for diarrhoea as it has been extensively researched for its potential to relieve this symptom. It is also used for overgrowths of harmful yeasts or bacteria, as it is able to stick onto and remove pathogenic microorganisms from the intestines, providing a more optimal environment for the indigenous friendly bacteria populations to flourish. It also has anti-inflammatory properties and can be a useful probiotic to help calm an inflamed or damaged digestive system.