CoQ10 for Dogs and Cats

King Charles Spaniel
Myxomatous mitral valve disease is the most common heart disease in dogs. It often leads to congestive heart failure. The Cavalier King Charles Spaniel is especially at risk of developing mitral valve disease at an early age. From the onset of congestive heart failure in dogs with mitral valve disease, the median survival time is less than a year even with medical therapy [Christiansen 2020]. Applied early enough, Coenzyme Q10 supplements may increase the life expectancy and quality of life for dogs at risk of heart disease.
Increasingly, people are feeding their dogs CoQ10 supplements. The CoQ10 supplementation is used provide dogs and cats the following health benefits [Gollakner 2020; Puotinen CJ 2019]:

  • improved cellular energy production
  • enhanced antioxidant protection against lipid peroxidation
  • anti-inflammatory effects
  • reduced endothelial dysfunction

Typically, the CoQ10 supplement is given by mouth as a capsule or as a liquid. It is possible, of course, to squeeze the CoQ10 filling out of a capsule onto the dog food.

Pharmacokinetics Study of Repeated Oral CoQ10 Dosing of Spaniels

Now, a research team in Denmark has investigated the pharmacokinetics of oral dosing of Cavalier King Charles Spaniels over a three-week period [Christiansen 2020].

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CoQ10 and Oxidative Stress: A 2020 Meta-analysis

Dr. Judy An Insider's Guide to Coenzyme Q10
Dr. William V. Judy, founder and president of SIBR Research, explains the differences between the ubiquinone form of Coenzyme Q10 and the ubiquinol form. The book is available from ISBN 978-87-7776-186-7.

First off, a few definitions:

Coenzyme Q10 is an essential bio-nutrient with vitamin-like properties. It is not considered a vitamin because our cells do synthesize Coenzyme Q10. However, once we reach adulthood, our bio-synthesis of Coenzyme Q10 begins to decline with increasing age [Kalén 1989]. Furthermore, statin medications are known to inhibit the bio-synthesis of Coenzyme Q10 [Okuyama 2015]. Supplementation is a must.

Oxidative stress is the result of an imbalance between the body’s production of harmful free radicals as a by-product of metabolic processes and the body’s supply of antioxidants to neutralize the free radicals. Oxidative stress, unchecked, results in damage to cell membranes, proteins, lipids, and DNA.

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Higher Plasma CoQ10 Levels, Lower Levels of Muscle Damage

Soccer stadium
The study participants were professional players of the Athletic Club Bilbao team that competed in the first division of the Spanish soccer league during the 2014/15 and 2015/16 seasons. Cumulative exhaustive exercise causes oxidative stress and damage to muscle cells; it also depletes the levels of Coenzyme Q10 in plasma, showing that the Coenzyme Q10 has been active as an antioxidant during the intense exercise. Higher CoQ10 levels can protect against the damage caused by strenuous exercise.

Data from a two-year observational study indicate that maintaining high levels of Coenzyme Q10 in plasma during the hardest part of the soccer season helps professional players [Sanchez-Cuesta 2020]:

  • prevent muscle damage (lower creatine kinase levels)
  • prevent kidney damage (lower uric acid levels)
  • reduce stress (lower cortisol levels)
  • achieve higher physical capacity (video analysis of distance run and running speed)

Based on the results of the observational study, the researchers speculated that CoQ10 can be safely used as a supplement for the prevention of accumulated muscle and kidney damage in elite athletes, possibly even for improving recovery time after intense competition [Sanchez-Cuesta 2020].

Coenzyme Q10 in Plasma is Predominantly in the Ubiquinol State

Coenzyme Q10 molecules are redox molecules with an oxidized state (ubiquinone) and a reduced state (ubiquinol). The Coenzyme Q10 in the plasma is predominantly in the reduced CoQ10 state, i.e. in the state that serves as an electron donor, making it the ideal state for antioxidant neutralization of harmful free radicals [Judy 2018].

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CoQ10 and Aging – A New Book

Professor Lopez-Lluch and Professor Littarru
Professor Guillermo López-Lluch (left), editor of the book Coenzyme Q and Aging, 2020, published by Springer Nature. ISBN: 978-3030456412.

Coenzyme Q10 is important to our understanding of the progression of the aging process and to our understanding of aging-related diseases such as cancer, cardiovascular disease, metabolic syndrome and diabetes, neurodegenerative disorders, and kidney diseases [López-Lluch 2020].

This is the message of a 369-page book entitled Coenzyme Q in Aging. The book is edited by Professor Guillermo López-Lluch, Pablo de Olavide University, Sevilla, Spain. It is dedicated to the memory of Professor Fred L. Crane (December 3, 1925 – August 11, 2016), who first discovered Coenzyme Q10, one of the most important molecules in humans [López-Lluch 2020].

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CoQ10 Supplementation to Improve Fertility in Women

Storch bringing baby
Three meta-analyses show beneficial effects of CoQ10 supplementation on semen quality, semen quantity, and semen mobility. Here, a meta-analysis of studies of CoQ10 supplementation of women with infertility shows a significant effect on clinical pregnancy rates.

A meta-analysis of five randomized controlled clinical studies (n=449 infertile women) has shown that CoQ10 supplementation increases clinical pregnancy rates compared with placebo treatment or no treatment. The CoQ10 supplementation significantly increases clinical pregnancy rates both overall and in infertility subgroups such as the poor ovarian response subgroup (n=286) and the polycystic ovarian syndrome subgroup (n=163) [Florou 2020].

All study participants were women of reproductive age (mean age 33 years) diagnosed with either poor ovarian response or polycystic ovary syndrome. All were attending an assisted reproductive technology clinic [Florou 2020].

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Testing CoQ10 Products for Quality

Lab scientist
CoQ10 products are not equally well absorbed. They do not give equally good health benefits. The bioavailability and the efficacy of the CoQ10 product varies considerably according to the formulation of the product. Consumers of CoQ10 products should seek out documentation for bioavailability and health benefits.

The CoQ10 Association has announced plans to test every Coenzyme Q10 product on the market in the US for potency and purity [Schultz 2020, August 13]. If all goes according to plan, the project will be completed by the end of 2020. We look forward to seeing the results of the testing.

Potency of CoQ10 Products

Testing for potency means ensuring that the capsule contains the quantity of Coenzyme Q10 specified on the label.

Earlier this year, in May, 2020, the NOW nutritional supplements company headquartered in Illinois, revealed that its in-house laboratory had tested 10 CoQ10 products purchased on

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CoQ10 for Women with Poor Ovarian Response

Pregnant woman
The reasons for a poor ovarian response to stimulation with gonadotropins are not clear. Mitochondrial dysfunction and oxidative stress are possible explanations for the diminished ovarian response. Coenzyme Q10 is essential for energy production in the mitochondria of oocytes and is important for antioxidant protection in oocytes.

Coenzyme Q10 pre-treatment of young low-prognosis patients with diminished ovarian reserve or poor ovarian response increased the patients’ ovarian response to stimulation and improved oocyte and embryo quality.

The CoQ10 pre-treatment was associated with improved pregnancy and live birth rates.

After one completed assisted reproductive technique treatment cycle, the women treated with Coenzyme Q10 had a 32% pregnancy rate and a 29% live birth rate. The women in the control group had a pregnancy rate of 17% and a 16% live birth rate.

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CoQ10 Supplements: What You Need To Know

Coenzyme Q10 capsules
The thing is, there are considerable differences in the absorption and bioavailability of the many commercial CoQ10 supplements.  An inexpensive CoQ10 supplement is not inexpensive if it gives only negligible absorption and bioavailability.  It is a waste of money.  It is important to choose a CoQ10 supplement with documented absorption and efficacy.

The active substance in the best Coenzyme Q10 nutritional supplements is a natural substance that is extracted in a yeast fermentation process; the Coenzyme Q10 is not a synthetic substance.

The CoQ10 molecules in the best nutritional supplements are the same molecules as the CoQ10 molecules synthesized inside the mitochondria in human cells.

As we get older, our cells’ ability to synthesize Coenzyme Q10 declines. Furthermore, the use of some drugs such as statin medications inhibits the cells’ synthesis of Coenzyme Q10.  We need a good supplement to make up for the loss.

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A Pharmacist Looks at CoQ10 Supplements

Dr. Ross Pelton
Dr. Ross Pelton brands himself as The Natural Pharmacist; he is also a certified clinical nutritionist. He is currently the Scientific Director for Essential Formulas. Dr. Pelton is the author of The Drug-Induced Nutrient Depletion Handbook. For a FREE copy of Dr. Pelton’s Quick Reference Guide to Drug-Induced Nutrient Depletions, go to

In the April/May 2020 issue of the journal IMCJ: Integrative Medicine: A Clinician’s Journal, pharmacist Dr. Ross Pelton reviews the most important developments in Coenzyme Q10 clinical research:

• The Q-Symbio Study in which researchers gave chronic heart failure patients 3 x 100 mg of Coenzyme Q10 or placebo daily as an adjuvant treatment together with conventional heart failure medications for two years. The outcome was significantly improved symptoms, quality of life, and survival in the CoQ10 treatment group compared to the placebo group [Mortensen 2014].

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Coenzyme Q10 for Adjunctive Treatment of Heart Failure

Blood circulation
Heart failure does not mean that the heart has stopped working. It means that the heart is not pumping as much blood out to the rest of the body as it should. The consequence is that the body organs and tissues do not get as much oxygen and as many nutrients as they need. Clinical trials show that treatment with Coenzyme Q10 in addition to conventional heart failure medication is beneficial.

Adjunctive treatment of chronic heart failure patients with 3 times 100 milligrams of Coenzyme Q10 daily for two years gave the following significant results compared with placebo treatment [Mortensen 2014]:

  • reduced number of deaths from heart disease
  • reduced number of deaths from all causes
  • reduced number of heart failure related hospitalizations
  • improved NYHA class

Absorption and Bioavailability of the CoQ10 Supplement

CoQ10 supplements are very different from one another. The CoQ10 supplement that gave the beneficial heart health outcomes listed above is a specially formulated CoQ10 preparation, specially formulated with respect to the carrier oils in which the Coenzyme Q10 raw material is dispersed and with respect to the heating and cooling process used in the manufacture of the supplement. It has documented absorption and bioavailability.

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