PQQ (pyrroloquinoline quinone) is a natural polyphenol that is an exceptionally potent antioxidant and cell regulator. PQQ with BioPQQ® from Doctor's Best® delivers antioxidant protection. PQQ is found in common foods and human breast milk, and it is a growth factor for the mitochondria that generate over 90% of your life energy. PQQ helps promote mitochondrial survival, proliferation and function.