PQQ - The bottle states it promotes new Mitochondrial development and provides Cardiovascular and Cognitive Support.
www.examine.com is a good resource for health minded people. Just read the text in the light blue boxes for a basic understanding yet reading less of the hard science.
www.lifeextension.com I find is a good source of info because they give complete references for all article even though they are makers/sellers of supplements. I use them to order blood work that I can get done locally at a fraction of the cost plus it is private.