Beta-glucans are natural polysaccharides found in the cell walls of certain fungi, bacteria, and plants, particularly in oats and barley. They are known for their potential health benefits, including supporting the immune system and lowering cholesterol levels. These compounds work by interacting with the immune cells in the body, enhancing their ability to fight infections. Additionally, beta-glucans can help regulate blood sugar levels and improve gut health, making them a valuable addition to a balanced diet.