Deficiency is poorly understood, but may be caused by synthesis problems in the body rather than insufficiency in the diet. It is now established that many patients on stain drugs (cholesterol lowering medications and HMG CoA Reductase inhibitors) have lowered coenzyme Q-10 levels and are at increased risk for deficiency. Many cardiologists routinely utilize coenzyme Q-10 for treating congestive heart failure. Low blood levels have been reported in people with heart failure, cardiomyopathies, gingivitis (an inflammation of the gums), morbid obesity, hypertension, muscular dystrophy, AIDS, an din some patients on peripheral dialysis. Aging is also associated with lower coenzyme Q-10 levels. Some studies have indicated that high doses of coenzyme Q-10 are useful in arresting Parkinson’s Disease and in the treatment of Alzheimer’s disease. The most common deficiency symptoms include angina and fatigue.

Coenzyme Q-10 is in every plant and animal cell. However, the amount of coenzyme Q-10 is probably insufficient to produce the clinical effects associated with therapy. The richest dietary sources are fish and red meat. The best supplement preparations are soft-gelatin capsules that contain coenzyme Q-10 in an oil base. Capsules ranges in dosages from 10 to 250 mg. Toxicity is not known. But dosages higher than 250 mg can be associated with nausea and diarrhea.

Pregnant women and nursing mothers should avoid supplementing with coenzyme Q-10 because long-term safety studies have yet to be completed. Patients with congestive heart failure on coenzyme Q-10 therapy should not discontinue the treatment without physician approval.