Glucans are a type of polysaccharide made up of glucose molecules linked together. They are found in various sources, including yeast, mushrooms, and cereal grains. Glucans play a significant role in the structure of cell walls and can have health benefits, such as supporting the immune system. There are different types of glucans, with beta-glucans being the most studied for their potential health effects. These compounds may help lower cholesterol levels and improve heart health. Additionally, glucans are often used in dietary supplements and functional foods for their beneficial properties.