PQQ is a quinone compound that is gaining recognition for its role in cellular energy metabolism and neuroprotection. It possesses antioxidant properties, which help protect cells from oxidative stress, a contributing factor to many chronic diseases. PQQ is involved in the functioning of mitochondria, often referred to as the powerhouse of cells. Mitochondria convert nutrients into energy, and PQQ appears to promote mitochondrial biogenesis, enhancing energy production.