Beta-glucan is a type of soluble fiber found in the cell walls of certain grains, fungi, and yeast. It is known for its potential health benefits, including supporting the immune system and lowering cholesterol levels. Common sources of beta-glucan include oats, barley, and mushrooms. When consumed, beta-glucan can help improve gut health by promoting the growth of beneficial bacteria. It may also aid in regulating blood sugar levels and enhancing heart health. Due to these properties, beta-glucan is often included in dietary supplements and functional foods.