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Articles

Coenzyme Q10: The Wonder Nutrient
With complete references for researchers

What does congestive heart failure, gum disease and obesity have in common? Very often, a deficiency of coenzyme Q10 (CoQ10). A lack of CoQ10 has also been implicated in arrhythmias, strokes, hypertension, heart attacks, atherosclerosis, muscular dystrophy and AIDS and many of these diseases can be prevented and treated successfully with CoQ10. Since its discovery and isolation 40 years ago hundreds of clinical research studies have been done on CoQ10 and it is now abundantly clear that this nutrient is absolutely vital to health(1-5).
Coenzyme Q10 (ubiquinone/ubiquinol) is a fat-soluble quinone with a structure similar to that of vitamin K. It is a powerful antioxidant both on its own and in combination with vitamin E and is vital in powering the body's energy production (ATP) cycle. CoQ10 is found throughout the body in cell membranes, especially in the mitochondrial membranes and is particularly abundant in the heart, lungs, liver, kidneys, spleen, pancreas and adrenal glands. The total body content of CoQ10 is only about 500-1500 mg and decreases with age(5).

Essential to the heart
Coenzyme Q10 has received particular attention in the prevention and treatment of various forms of cardiovascular disease. It is highly effective in preventing the oxidation of low-density lipoprotein cholesterol (LDL) which leads to atherosclerosis(2,6-8). Several studies have shown that patients with congestive heart failure and other cardiovascular diseases have significantly lower levels of CoQ10 in their heart tissue than do healthy people and supplementation with as little as 100 mg/day has been shown to markedly improve their condition. CoQ10 is now approved in Japan for the treatment of congestive heart failure(2-5,9,10).
Heart attacks and strokes produce a burst of free radicals (ischemia- reperfusion) which can result in extensive tissue damage. Patients with high CoQ10 levels suffer less damage from these events and Japanese researchers have found that CoQ10 supplementation prior to and immediately following open heart surgery is highly beneficial in preventing reperfusion injury - a common complication in heart surgery(2,4,5,11,12). Supplementation with CoQ10 has also been found beneficial in patients with chronic stable angina, mitral valve prolapse and irregular heart beat (arrhythmias)(2-5,13-15).
Coenzyme Q10 has also proven useful in the treatment of various cardiomyopathies (diseases of the heart muscle that reduces its pumping capacity). Studies have shown that supplementation with as little as 100 mg/day for 12 months results in better pumping capacity (increased ejection fraction), increased muscle strength and improved breathing(2- 4,16).
Several studies indicate that CoQ10 may be beneficial in the treatment of hypertension (high blood pressure). A study of 109 patients with long-standing, essential hypertension, who were on antihypertensive drugs, concluded that supplementation with an average of 225 mg/day of CoQ10 improved functional status, allowed about half the patients to discontinue most of their blood pressure medications and resulted in an average decrease of systolic blood pressure from 159 to 147 mm Hg and a diastolic pressure decrease from 94 to 85 mm Hg. Smaller, more recent Japanese studies have confirmed these findings(2-5,17-19).
Studies at the University of Ancona in Italy have provided evidence that CoQ10 supplementation reduces blood levels of epinephrine (adrenalin) and other catecholamines; this is believed to be partly responsible for the drop in blood pressure and may also explain why CoQ10 is effective in reducing the incidence of certain types of arrhythmias(2,20).

Boosts energy and brain power
Coenzyme Q10 is a great boost to heart health, but it has many other beneficial effects. Strenuous physical exercise reduces blood levels of CoQ10 and supplementation with 60 mg/day has been found to improve athletic performance(2,3,21). Administration of CoQ10 alone or in combination with vitamin B6 (pyridoxine) boosts the immune system and may be useful in the treatment of AIDS and other infectious diseases(3,22,23). An adequate level of CoQ10 in the body is essential to proper muscle functioning and several studies have indeed shown that supplementation with 100-150 mg/day of CoQ10 markedly improves the condition of people suffering from muscular dystrophy(2-5,25-28).
Many overweight people have very low levels of CoQ10 and supplementation may enable them to lose weight due to the effect of CoQ10 in speeding up the metabolism of fats(3,4,29).
Some very recent, highly intriguing research carried out at the Institute of Neurosciences in Argentina has shown that brain activity and alertness is enhanced in hypertensive patients within one hour of oral administration of 100 mg of CoQ10(30).

Keeps your gums healthy and fights cancer
CoQ10 has been used with success in combatting periodontal diseases, especially gingivitis (gum disease). Tissue affected by gingivitis is deficient in CoQ10 and experiments have shown that supplementation with as little as 50 mg/day can decrease inflammation. More recent research has shown that topical application of CoQ10 dissolved in soya oil (85 mg/ml) to affected areas (periodontal pockets) reduces bleeding and the depth of the pockets(2-5,31-34).
Research carried out in Denmark has provided some tantalizing evidence that CoQ10 may also be effective in the fight against certain cancers. A trial involving the treatment of 32 breast cancer patients with megadoses of vitamins, minerals, essential fatty acids and coenzyme Q10 (90 mg/day) in addition to conventional therapy showed a highly beneficial effect of the supplementation. Two of the patients in the trial whose tumours had not regressed had their CoQ10 dosages increased to 390 mg/day and 300 mg/day respectively with the result that their tumours disappeared completely within three months(3,35). CoQ10 supplementation is also very important for cancer patients undergoing chemotherapy with heart toxic drugs such as adriamycin and athralines. Recent research has also shown that certain cholesterol-lowering drugs (lovastatin, etc.) block the natural synthesis of CoQ10 so supplementation with 100 mg/day is recommended for patients taking these drugs(2,3,36).

So how much do you need?
The body can synthesize coenzyme Q10 and it is also found in several dietary sources, notably organ meats. The level of CoQ10 in human organs peaks around the age of 20 years and then declines fairly rapidly. The decrease in CoQ10 concentration in the heart is particularly significant with a 77-year-old person having 57 per cent less CoQ10 in the heart muscle than a 20-year-old(30). Some experts involved in CoQ10 research believe that many people, especially older people and people engaging in vigorous exercise may be deficient in CoQ10 and may benefit from supplementation. The recommended daily dosage for health maintenance is 30 mg; however, considerably higher amounts are required in the treatment of the various diseases for which supplementation has been found beneficial(2,3,37,38). CoQ10 should be taken with a meal containing some fat or even better, in combination with soya or vegetable oil which enhances its absorption quite substantially(3). CoQ10 supplements are readily absorbed by the body and no toxic effects have been reported for daily dosages as high as 300 mg. The safety of CoQ10, however, has not been established in pregnancy and lactation, so caution is advised here until more data becomes available(3,5).

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