Probiotics are live microorganisms that confer various health benefits to the host when administered in adequate amounts. Typically, these beneficial bacteria and yeasts are found in foods like yogurt, fermented products, and dietary supplements. The most common probiotics belong to the Lactobacillus and Bifidobacterium genera, although other microorganisms such as Saccharomyces boulardii (a type of yeast) are also used.