Mitochondria are microscopic organelles found within cells, and are by far the largest producer of the molecule adenosine triphosphate (ATP), which provides energy to many processes in living cells. The process by which mitochondria synthesize ATP generates a large amount of reactive oxygen species (ROS), chemical groups that are highly reactive.
Click here for original story, New method for delivering an antioxidant directly to mitochondria in the liver, mitigating oxidative stress
Source: Phys.org