A purpose of the present invention is to provide a highly safe composition that can be used to improve, suppress decline of, or maintain mitochondrial function and/or mitochondrial energy production and that can be taken easily and continuously without concern about side effects. Another purpose of the present invention is to provide a method, etc., for improving, suppressing decline of, or maintaining mitochondrial function and/or mitochondrial energy production. The present invention pertains to a composition containing one or more types of sesamin, and pyrroloquinoline quinone (PQQ) or a salt thereof.
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