CoQ10 (Ubiquinol) — The Mitochondrial Electron Carrier
Coenzyme Q10 is a fat-soluble antioxidant and essential component of the mitochondrial electron transport chain. Levels decline ~65% between age 20 and 80, and statin use further depletes CoQ10. Ubiquinol (the reduced form) is significantly more bioavailable than ubiquinone.
Mechanism of Action
CoQ10 shuttles electrons between Complex I/II and Complex III in the mitochondrial inner membrane, driving ATP synthesis. As an antioxidant, it scavenges superoxide radicals and regenerates vitamins C and E. Ubiquinol (CoQH2) is the active antioxidant form; ubiquinone (CoQ10) must be reduced to ubiquinol in cells.
Human Trial Evidence
The Q-SYMBIO trial (2014, JACC Heart Failure, n=420) showed CoQ10 (300 mg/day) reduced all-cause mortality by 43% in heart failure patients. Multiple trials show CoQ10 reduces statin-induced myopathy. A 2018 Frontiers in Physiology review confirms CoQ10 supplementation improves mitochondrial function in aging.
Dosing Protocol
100–300 mg/day ubiquinol (preferred over ubiquinone for ages 40+). Statin users: 200–300 mg/day. Take with fat for absorption. Split dosing improves plasma levels. Ubiquinol has ~3× better bioavailability than ubiquinone.
Safety & Contraindications
Excellent safety profile. Mild GI effects at doses >300 mg/day. May reduce warfarin efficacy — monitor INR if anticoagulated. May lower blood pressure — monitor if on antihypertensives. No serious adverse events in trials up to 1,200 mg/day.