FOS (FructoOligoSaccharides) is a fermentable, soluble fiber, which makes it a prebiotic. It supportss the growth of friendly bacteria in the gut. By promoting a healthy balance of gut flora, this supplement helps maintain a healthy digestive system and overall well-being. It’s a simple and natural way to support gut health. Plus, with its slightly sweet taste, I also use it as a low-calorie sweetener in my drinks and recipes!