Probiotics are living microorganisms that provide health benefits when consumed in adequate amounts. They help maintain a healthy balance of bacteria in the gut and can aid in digestion, strengthen the immune system, and reduce risks of certain diseases. Common probiotic strains include Lactobacillus and Bifidobacterium species. Probiotics are available in foods like yogurt as well as supplements. Prebiotics are non-digestible fibers that feed beneficial bacteria in the gut. Synbiotics combine probiotics and prebiotics to support a healthy microbiome.