Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods Levels of pyrroloquinoline quinone in various foods