Digestive enzymes are essential to the body's absorption and full use of food.&ampnbsp; The capacity of the body to make enzymes diminishes with age, and therefore the efficiency of digestion declines.&ampnbsp; NOW&ampreg; Optimal Digestive System contains a blend of non-GMO fungal-derived enzymes that will aid in the digestion of most foods, including beans and cruciferous vegetables.&ampnbsp; The vegetarian enzymes in NOW&ampreg; Optimal Digestive System have been proven in a controlled laboratory study by the Netherlands Organization for Applied Scientific Research (TNO Nutrition and Foods Research) to have efficacy throughout the entire pH range of the digestive system and are not degraded by acid in the stomach.*