First of all, congratulations on resurrecting a thread that has been dormant for over 2 years.
There is a tremendous body of research in both humans and equines: just Google "Equine Enzyme Co-Q10".
I don't know what you call a "tremendous body of research", but employing the exact Google search string you suggested returned 6 pages of commercial websites trying to sell CoQ10. And those sites contained just obscure references to anecdotal "research". Only 1 science-based
website citing CoQ10's apparent human properties as an antioxidant turned up. http://www.informapharmascience.com/doi/abs/10.1080/14756360500337634?cookieSet=1&journalCode=enz
Vitamins, minerals, other dietary supplements and topical applications that are not specifically tested for claims of efficacy by the US Food & Drug Administration are not regulated and therefore remain "holistic" by definition. Ergo; anything a commercial sales outlet for CoQ10 or any other similar product claims as a unique, superior or alternative treatment is as holistic as the ancient sage advice to "just rub some dirt on it." ~FH