What Are Probiotics? Probiotics are beneficial bacteria and yeasts that reside primarily in the digestive tract, contributing to a balanced gut microbiome. The microbiome, a complex community of trillions of microorganisms, plays a critical role in digestion, immunity, mental health, and even weight regulation. Common probiotic strains include Lactobacillus, Bifidobacterium, and Saccharomyces boulardii, found in […]