PQQ is a quinone compound that was first discovered in the early 1970s. It is found in a variety of foods, particularly in fermented products, and is known to play a critical role as a cofactor in enzymatic reactions. PQQ supports the function of certain dehydrogenases and is involved in cellular respiration, aiding the conversion of glucose and other substrates into energy. One of the key aspects of PQQ is its ability to stimulate mitochondrial biogenesis, a process that enhances the number and function of mitochondria within cells.