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Life Extension Magazine

LE Magazine February 2006

CoQ10’s “Other” Health Benefits

By Sherry Kahn, MPH

Coenzyme Q10 is a mitochondrial energizer that has shown remarkable effects against common heart ailments and neurological disorders. In just the past year, scientists have uncovered specific mechanisms indicating that CoQ10 may have a role in fighting certain cancers. Most surprising, however, are new studies that show how CoQ10 guards against a wide array of common age-related disorders. In this article, we summarize recent discoveries that significantly broaden the clinical utility of CoQ10.

Guarding the Brain After Cardiac Arrest

People who survive cardiac arrest often suffer irreversible brain damage as a result of the disruption of oxygen to the brain. European researchers recently investigated whether combining CoQ10 with mild hypothermia—a technique proven to reduce neuronal damage and increase survival—might enhance the effects of that treatment.1

Forty-nine patients who had suffered cardiac arrest and then received cardiopulmonary resuscitation were randomly selected to receive hypothermia (reduction of body temperature) treatment plus CoQ10 or hypothermia plus placebo. The hypothermia treatment involved the patients being placed on a body-surface-cooling mattress.

The patients were then administered either liquid CoQ10 (250 mg followed by 150 mg three times daily for five days) or a placebo through a nasogastric tube. The remarkable findings showed that three-month survival in the CoQ10 group was 68%, compared to only 29% in the placebo group. Coenzyme Q10 thus helped reduce the death rate from cardiac arrest by an astounding 57%. The researchers also found that 36% of patients in the CoQ10 group had a good neurological outcome at three months, versus only 20% in the placebo group.1

Preventing the Onset of Migraine

Migraine headaches are a debilitating, all-too-common affliction. Because mitochondrial dysfunction may play a role in migraines by limiting oxygen metabolism, researchers recently explored the use of CoQ10 in preventing these headaches. Published in the February 2005 issue of Neurology, the research describes a placebo-controlled trial of 42 patients in Switzerland.2

Patients who had suffered migraines for a year or more, with two to eight attacks per month, were randomly assigned to receive either 100 mg of CoQ10 or placebo, three times daily. At the end of the three-month trial, the CoQ10-treated group had lower attack frequency and fewer headache days and days with nausea than did the placebo group. The mean number of monthly migraine attacks dropped from 4.4 to 3.2 in the CoQ10 group, compared to a negligible decrease from 4.4 to 4.3 in the placebo group.2

In this study, supplemental CoQ10 reduced migraine frequency by 27%.

Slowing Early Macular Degeneration

Age-related macular degeneration is the most common cause of vision loss in people over 60.3 With the deterioration of the macula (a tiny cluster of highly specialized cells in the retina) central vision progressively begins to blur. As the disease worsens, central vision loss may increase until it becomes impossible to perform tasks that require detailed vision, such as driving and reading.

In recent years, researchers have focused on how oxidative damage affects age-related macular degeneration. The eye, one of the body’s most metabolically active organs, not only generates an enormous amount of free radicals through normal function, but also incurs additional oxidative damage from ultraviolet radiation and air pollution. In recent trials, the use of antioxidants has been shown to counter age-related macular degeneration. For example, in an 11-center, double-blind clinical trial conducted by the National Eye Institute (a division of the National Institutes of Health), a combination of antioxidants plus zinc slowed macular degeneration progression in people with intermediate or advanced disease by about 25%.4

Hungarian scientists are now exploring a metabolic rather than an antioxidant approach to managing macular degeneration. Citing findings that mitochondrial dysfunction might also play a role in the development of the disease, the researchers designed a clinical trial to evaluate intervention in early age-related macular degeneration with a combination of compounds—including CoQ10—that have demonstrated the ability to improve mitochondrial metabolism. The researchers reported results of their double-blind, placebo-controlled trial last year in the journal Opthalmologica.5 More than 100 patients with early age-related macular degeneration were randomly assigned to receive either two capsules per day containing 200 mg of acetyl-L-carnitine, 780 mg of omega-3 fatty acids, and 20 mg of CoQ10, or capsules containing an equal quantity of soy oil.

At the end of the 12-month treatment period, the researchers found statistically significant improvement in the treatment group as measured by all four parameters of visual function studied. In addition, only one of the 48 patients (2%) in the treatment group showed clinically significant worsening in visual field mean defect (blind spots in the visual field), the primary study endpoint, compared to 9 of 53 patients (17%) in the placebo group. The decrease in drusen—tiny yellow retinal deposits associated with macular degeneration—of the treated eyes was also statistically significant compared to placebo when either the most-affected eyes or the less-affected eyes were considered. In the less-affected eyes, the drusen-covered area decreased by 23% in the treated group, but increased by 13% in the placebo group. These findings suggest that intervention with an appropriate combination of nutrients that affect mitochondrial lipid metabolism may stabilize and even improve visual functions in early age-related macular degeneration.5

New Applications in Fighting Cancer

Research on CoQ10 and cancer has focused on two lines of inquiry: CoQ10’s ability to improve immune response and its ability to decrease the cardiotoxicity caused by a common class of anti-cancer chemotherapeutic agents.

Patients with cancer often exhibit low levels of CoQ10,6,7 and researchers have shown that CoQ10 can increase immune response in humans.8

Based on these findings, Danish researchers investigated CoQ10’s effects alone and in combination with other nutrients as an adjunctive therapy for breast cancer.

In one case report, the researchers describe three breast cancer patients with metastasized cancer. The women underwent conventional cancer treatment and supplemented with a daily dose of 390 mg of CoQ10. All three women demonstrated tumor regression and decreased incidence of metastasis.9

In another study, the same research team investigated 32 high-risk breast cancer patients whose malignancy had spread to the lymph nodes.10 In addition to conventional therapeutic interventions, this group of patients received a daily combination of nutrients (vitamin C: 2850 mg; vitamin E: 2500 IU; beta-carotene: 32.5 IU; selenium: 387 mcg; and secondary vitamins and minerals), essential fatty acids (1.2 grams of gamma linolenic acid and 3.5 grams of omega-3 fatty acids), and 90 mg of CoQ10. At the end of the 18-month trial, six patients showed apparent partial remission, none of the patients showed signs of additional metastases, and their quality of life improved. None of the patients died during the study period, though four deaths were expected based on the patients’ disease stage. In one of the six patients with partial remission, the dose of CoQ10 in the nutritional protocol was increased to 390 mg. After two months, that patient’s tumor had disappeared completely, as confirmed by a mammogram.10

While chemotherapy drugs can be highly effective, their use can also be limited by toxic side effects. This has been noted in the case of anthracyclines, a class of drugs widely used in cancer chemotherapy. These drugs have demonstrated efficacy in the treatment of leukemia, lymphomas, and solid malignancies, and are often used to treat breast cancer, with higher doses yielding greater clinical responses. These higher doses of anthracyclines, however, can produce toxic effects on heart tissue, possibly leading to cardiomyopathy and heart failure that are not responsive to conventional pharmacological interventions.11 In fact, anthracyclines selectively damage mitochondria in the heart, but not in other organs.11 Since coenzyme Q10 supports both heart tissue and mitochondria, researchers conducted human trials to determine whether CoQ10 might prevent cardiotoxicity during the administration of anthracyclines.12

Two recent review articles addressed CoQ10’s potential as an adjunctive therapy during chemotherapy with anthracyclines. Writing in the Journal of Clinical Oncology, researchers summarized five reviewed studies in which CoQ10 was given along with anthracyclines.12 They report that in three of the studies that measured heart rhythm, patients who received CoQ10 showed favorable changes suggesting that CoQ10 might have a stabilizing effect on the heart. They also note that supplementation did not interfere with anthracycline treatment, and that no adverse effects were reported in any of the trials. The authors concluded that although coenzyme Q10 demonstrates potential for reducing cardiotoxicity, larger and more rigorous investigations are needed.

Slowing Neurodegenerative Disease Progression

Many investigators have conducted preclinical studies examining how oxidative stress and impaired mitochondrial function may contribute to neuronal cell death, a characteristic of Parkinson’s, Alzheimer’s, and other neurodegenerative diseases.13-17 For example, a recent journal article in Toxicology and Applied Pharmacology reported on the effects of the herbicide paraquat on neuronal cell death in the laboratory.17 The researchers found that this toxic chemical damaged mitochondria and increased free radical production, eventually resulting in the death of neuronal cells. Pretreatment of the cell cultures with CoQ10, however, inhibited both mitochondrial dysfunction and free radical generation.17 The researchers postulated that coenzyme Q10 may prove useful in preventing and treating neurodegenerative conditions related to environmental toxins.

While published research on the use of CoQ10 in slowing the progression of Alzheimer’s disease has been limited to preclinical studies, investigations of CoQ10 and Parkinson’s disease have moved into clinical trials, including randomized controlled studies. This work has been led by Clifford Shults, MD, professor of neurosciences at the University of California at San Diego School of Medicine. In Parkinson’s disease, brain cells that produce the neurotransmitter dopamine progressively die. Research in animals has shown that CoQ10 can protect the substantia nigra, the area of the brain where these cells reside. Studies by Dr. Shults and others have shown that mitochondrial dysfunction and diminished mitochondrial CoQ10 levels frequently occur in Parkinson’s sufferers.18

With funding from the National Institute of Neurological Disorders (a division of the National Institutes of Health), Dr. Shults and his colleagues undertook the first double-blind, placebo-controlled, multicenter clinical trial of CoQ10 in patients with early untreated Parkinson’s disease. In this phase II, dose-finding study, 80 patients were randomly assigned to receive one of three different CoQ10 doses (300 mg/day, 600 mg/day, or 1200 mg/day) with vitamin E, or a placebo containing vitamin E alone. The patients were followed for 16 months or until the participants required levodopa, a standard drug treatment for managing disease symptoms.19

The results, reported in the Archives of Neurology, showed that patients who received the largest dose of CoQ10 (1200 mg/day) had 44% less decline in mental function, movement, and ability to carry out activities of daily living than those who received the placebo.19 Patients who received CoQ10 doses of 300 mg/day and 600 mg/day also showed some slowing in decline compared to the placebo group, but not as much as those who took the highest dose. The authors concluded that CoQ10 was safe and well tolerated at doses up to 1200 mg/day.

Most recently, Dr. Shults and his team conducted an open label trial in which 17 patients were given an escalating dose of CoQ10 (1200 mg/day, 1800 mg/day, 2400 mg/day, and 3000 mg/day) combined with a stable dose of 1200 IU/day of vitamin E over a two-month period.20 They found that CoQ10 was well tolerated at high doses, but plasma levels of CoQ10 did not continue to rise when the dose was increased from 2400 to 3000 mg/day. There was no significant change in motor abilities in these Parkinson’s disease patients, some of whom were concurrently taking medications for the disease. Based on these findings, the researchers recommended conducting a phase III study to investigate the longer-term effect of high doses on previously untreated patients.


Clinical trials assessing coenzyme Q10’s efficacy in managing hematological, musculoskeletal, and nervous system disorders are under way. To learn whether you may be eligible to participate in these investigations, visit

“Our [phase III] study will compare a placebo with 1200 mg/day and 2400 mg/day of CoQ10 and will enroll 200 subjects with early untreated disease in each treatment arm,” Dr. Shults told Life Extension in an exclusive interview. “The study . . . will probably take four years, with the results published a year later,” he added. In addition to that study, the National Institute of Neurological Disorders and Stroke is currently investigating the effects of a 2400-mg/day dose of CoQ10 in patients with early, untreated Parkinson’s disease.18

A clinical trial has also been undertaken in patients with Huntington’s disease, a neurodegenerative genetic disorder. This trial, conducted by the Huntington Study Group, randomly assigned 347 patients with Huntington’s disease to receive CoQ10 at 600 mg/day, remacemide hydrochloride at 600 mg/day, a combination of both, or placebo. Over the 30-month trial, the CoQ10 treated patients showed a 13% decrease in overall functional decline and beneficial trends in some secondary measures. However, the difference between the CoQ10 group and the other groups did not reach statistical significance.21

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