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Enzymes are specialized protein molecules that catalyze, or speed up, biochemical reactions. They are involved in all aspects of metabolism, growth, and development. Digestive enzymes are responsible for the digestion or breaking down of food. Supplementing with digestive enzymes may be helpful in people with digestive problems. There are many confusing mixtures of digestive enzymes. Consult with a health care provider to determine which type of enzyme preparation, if any, is best for you.