Coenzyme Q10 (Ubiquinone)
The essential cofactor of the mitochondrial respiratory chain that declines with age
Definition
Coenzyme Q10 (CoQ10, ubiquinone) is a fat-soluble molecule present in all cell membranes, especially the inner mitochondrial membrane, where it acts as an essential electron carrier in complexes I, II, and III of the respiratory chain — the system that produces 95% of cellular ATP. It also acts as a powerful fat-soluble antioxidant that regenerates oxidised vitamin E. Tissue levels drop 50-70% between ages 20 and 80, and even more with chronic statin use (which blocks the mevalonate pathway shared with endogenous synthesis).
Detailed explanation
Two active forms exist: ubiquinone (oxidised form, more stable and economical) and ubiquinol (reduced form, already bioactive). In healthy people under 50, hepatic conversion of ubiquinone to ubiquinol is efficient; in those over 50, with heart failure, or on statins, ubiquinol has 2-4× higher bioavailability.
The most solid clinical evidence is in chronic heart failure: the Q-SYMBIO trial (2014, J Am Coll Cardiol) showed that 300 mg/day of CoQ10 for 2 years reduced cardiovascular mortality by 43% in patients with class III-IV heart failure. In migraine, doses of 100-300 mg/day reduce frequency and duration. In male infertility, it improves sperm motility and morphology.
In longevity it is typically combined with PQQ (pyrroloquinoline quinone, a stimulator of mitochondrial biogenesis), creating synergy between function (CoQ10) and production of new mitochondria (PQQ). Typical doses: 100-200 mg/day of ubiquinol with meals (it needs fat for absorption).
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