Pyrroloquinoline quinone (PQQ) – an unproved supplement Larry H. Bernstein, MD, FCAP, Curator LPBI Pyrroloquinoline quinone (PQQ)  Pyrroloquinoline quinone (henceforth PQQ) is a small quinone molecule which has the ability to be a REDOX agent, capable of reducing oxidants (an antioxidant effect) and then being recycled by glutathione back into an active form. It appears … Continue reading Pyrroloquinoline quinone (PQQ) – an unproved supplement