Glucan is a type of polysaccharide made up of glucose molecules linked together. It is commonly found in the cell walls of fungi, bacteria, and plants, particularly in oats and barley. Glucans play a crucial role in providing structural support and energy storage for these organisms. In addition to their structural functions, glucans are known for their potential health benefits. They may help boost the immune system and lower cholesterol levels. Some studies suggest that glucans can also improve gut health by acting as prebiotics, promoting the growth of beneficial gut bacteria.