Beano is an enzyme supplement taken at the beginning of a meal to help prevent gas formation and discomfort from foods such as beans, broccoli, grains, onions, pasta, vegetables, etc. Beano Food Enzyme Dietary Supplement. Helps stop gas before it starts. Beano is a dietary supplement; a food enzyme from a natural food source. It is not a drug. Use Beano with your first bite of the food serving so you stay comfortable after.