Be Sure Food Enzyme Prevents Gas. All Natural. Take with Meal. Dietary Supplement. Beans, Broccoli, Cauliflower, Lentils, and Soy-Based Foods contain the complex sugars which can cause embarrassing gas (flatulence). Be Sure contains food enzymes that are able to convert offending complex sugars into simple, digestive sugars, which help stop gas before it starts. Now you can enjoy your favorite foods without the embarrassing consequences.