CoQ10 (Ubiquinol) — Lipophilic quinone / mitochondrial cofactor
Coenzyme Q10 (ubiquinone) and its reduced form ubiquinol are essential components of the mitochondrial electron transport chain (Complexes I–III), transferring electrons and generating the proton gradient for ATP synthesis. Also acts as a membrane antioxidant. Endogenous synthesis declines with age and is inhibited by statins (via HMG-CoA reductase blockade). Ubiquinol form (reduced) has ~3x greater bioavailability than ubiquinone. Clinical evidence strongest for: heart failure (NYHA class III-IV; Q-SYMBIO trial: 43% reduction in MACE), statin-associated myopathy, male infertility, and migraine prevention.
Overview
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Compound Class
Lipophilic quinone / mitochondrial cofactor
Mechanism of Action
Coenzyme Q10 (ubiquinone) and its reduced form ubiquinol are essential components of the mitochondrial electron transport chain (Complexes I–III), transferring electrons and generating the proton gradient for ATP synthesis. Also acts as a membrane antioxidant. Endogenous synthesis declines with age and is inhibited by statins (via HMG-CoA reductase blockade). Ubiquinol form (reduced) has ~3x greater bioavailability than ubiquinone. Clinical evidence strongest for: heart failure (NYHA class III-IV; Q-SYMBIO trial: 43% reduction in MACE), statin-associated myopathy, male infertility, and migraine prevention.
Regulatory Status
OTC dietary supplement. Not FDA-approved for any indication.
Evidence Level
Moderate — Q-SYMBIO trial, multiple RCTs for statin myopathy and male fertility. Grade B from European guidelines for HF adjunct therapy.