NCI: Any substance involved in metabolism, either as a product of metabolism or as necessary for metabolism.,CHV: substances produced by cell metabolism,CHV: substances produced by cell metabolism,NCI: A substance made or used when the body breaks down food, drugs or chemicals, or its own tissue (for example, fat or muscle tissue). This process, called metabolism, makes energy and the materials needed for growth, reproduction, and maintaining health. It also helps get rid of toxic substances.

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