Plasma coenzyme Q10 (CoQ10) response to oral ingestion of various CoQ10 formulations was examined. Both total plasma CoQ10 and net increase over baseline CoQ10 concentrations show a gradual increase with increasing doses of CoQ10. Plasma CoQ10 concentrations plateau at a dose of 2400 mg using one specific chewable tablet formulation. The efficiency of absorption decreases as the dose increases....

It has been postulated that lipid peroxidation plays a crucial role in the pathogenesis of atherosclerosis. As CoQ10H2 (reduced form of coenzyme Q10) is easily oxidized to CoQ10 (oxidized form of coenzyme Q10), it has been proposed that the CoQ10H2/CoQ10 ratio may be used as a possible marker of in vivo oxidative stress. However, sample preparation has an important effect on the redox status of...

The authors measured coenzyme Q10 (CoQ10) concentration in muscle biopsies from 135 patients with genetically undefined cerebellar ataxia. Thirteen patients with childhood-onset ataxia and cerebellar atrophy had markedly decreased levels of CoQ10. Associated symptoms included seizures, developmental delay, mental retardation, and pyramidal signs. These findings confirm the existence of an ataxi...

This review discusses the potential role of coenzyme Q10 in the treatment of acquired immunodeficiency syndrome (AIDS), cancer, periodontal disease, gastric ulceration, obesity, muscular dystrophy, and allergy. The effect of coenzyme Q10 (CoQ10) on immune function and physical performance is also reviewed. Controlled trials have demonstrated a beneficial effect of CoQ10 in the treatment of peri...

Coenzyme Q10 (CoQ10) is a lipid-soluble antioxidant that could have beneficial effects in patients undergoing cardiac surgery with cardiopulmonary bypass. There is no clear evidence about its clinical effects or a systematic review published yet. We aimed to conduct a systematic review and meta-analysis of the literature to elucidate the role of coenzyme Q10 in preventing complications in patie...

A possible relationship between the pathogenesis of type 2 diabetes and coenzyme Q10 (CoQ10) deficiency has been proposed. The aim of this study was to assess the effect of CoQ10 on metabolic control in 23 type 2 diabetic patients in a randomized, placebo-controlled trial. Treatment with CoQ10 100 mg bid caused a more than 3-fold rise in serum CoQ10 concentration (p < 0.001). No correlation was...

This review discusses the role of coenzyme Q10 (CoQ10) in cardiovascular disease, hypertension, diabetes mellitus, and infertility. Deficiencies of CoQ10 have been documented in patients with heart disease. Administration of CoQ10 has been shown to prolong survival and improve quality of life in patients with cardiomyopathy. In patients with congestive heart failure, CoQ10 ameliorated symptoms,...

Coenzyme Q10 (CoQ10), first identified by Moor et al in 1940, is a fat soluble quinone with characteristics common to vitamins [1]. It is found in the organs of various animal species with highest concentrations in the heart, liver, kidney, muscles and pancreas [2, 3]. Festenstein et al in 1955 named the substance ubiquinone [2] while Crane et al in 1957 choose the name coenzyme Q [4]. Ubiquino...

Donnino and colleagues provide new insights into the field of oxidative stress and mitochondrial dysfunction during septic shock. These authors suggest a coenzyme Q10 (CoQ10) deficiency in patients with septic shock. Larger prospective observational trials measuring CoQ10 in patients with septic shock are required to confirm the possibility of CoQ10 depletion. This study is a new step toward a ...

Coenzyme Q (CoQ, ubiquinone) is a component of the electron transport system in the mitochondria of eukaryotes and is essential for energy production. CoQ consists of a quinone moiety and an isoprenoid chain. Almost all living cells produce CoQ with different isoprenoid chain lengths. For example, CoQ10, which is a popular food supplement, possesses 10 isoprene units. CoQ10 is commercially prod...