Probiotic supplements have grown into a multibillion-dollar industry, spurred by claims that the products will populate your gut with bacteria that can boost your health in numerous ways. But beware of the hype: In healthy people, probiotic supplements offer little benefit, and they can potentially do more harm than good. Probiotic supplements come in the form of capsules, gummies, powders and pills that contain live microorganisms believed to boost gut health. Studies have found that probiotic supplements can reduce symptoms of irritable bowel syndrome and inflammatory bowel disease. First, eat a variety of vegetables, nuts, seeds, beans and whole grains, which provide gut microbes the fiber-rich fuel that they need to thrive.