..., and here's a link with a bit of copy on tests done on the efficacy of the vitamin:
ncbi.nlm.nih.gov/pubmed/824...
"...We studied the effects of the oral administration of CoQ10 at 90 mg/day for 8 weeks on pulmonary function and exercise performance in eight patients with COPD. Serum CoQ10 levels were significantly elevated in association with an improvement in hypoxemia at rest, whereas pulmonary function was unaltered. Oxygen consumption during exercise was not changed, whereas PaO2 was significantly improved, and heart rate was significantly decreased compared with the results obtained at an identical workload at baseline.
Furthermore, lactate production was suppressed during the anaerobic exercise stage after CoQ10 administration, and exercise performance tended to increase. These data suggested that CoQ10 has favorable effects on muscular energy metabolism in patients with chronic lung diseases who have hypoxemia at rest and/or during exercise..."
(..explanation of PaO2...)
airwayjedi.com/2015/12/09/w...
"...Pa02, put simply, is a measurement of the actual oxygen content in arterial blood. Partial pressure refers to the pressure exerted on the container walls by a specific gas in a mixture of other gases. When dealing with gases dissolved in liquids like oxygen in blood, partial pressure is the pressure that the dissolved gas would have if the blood were allowed to equilibrate with a volume of gas in a container.
In other words, if a gas like oxygen is present in an air space like the lungs and also dissolved in a liquid like blood, and the air space and liquid are in contact with each other, the two partial pressures will equalize...."