Enzymes are specialized proteins that accelerate chemical reactions that otherwise would not occur under conditions to sustain life. The enzyme itself does not change during the reaction, but changes one compound (known as the "substrate") into another (known as the "product").
Enzymes are involved in almost every metabolic function in any living organism. There are over 10,000 separate and distinct enzymes that have been characterized. Each enzyme usually has only one function, or works on one substrate to produce one product; therefore, enzymes demonstrate specificity in their function.
Not all enzymes are useful when taken orally. Metabolic enzymes are types of enzymes that work inside of specific cells and taken orally cannot be directed to enter the correct cell from the digestive tract.Digestive enzymes, however, are active orally as they do not need to enter a specific cell to perform their function.
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