All supplements
Grade B Evidence

CoQ10 (Ubiquinol)

Statins deplete CoQ10 by 40-50%. The repletion protocol and the evidence behind it.

Statin-induced myopathy / CoQ10 repletionCardiovascular disease and heart failureMitochondrial dysfunction / fatigueME/CFSMigraine preventionMale fertilityFibromyalgiaNeurodegenerative disease support

Evidence highlight

Atorvastatin 40mg reduces plasma CoQ10 by 40-50% within 30 days. Randomized trials show CoQ10 supplementation (100-300mg/day) significantly reduces statin-associated muscle pain scores.

Therapeutic dosing

Ubiquinol (reduced CoQ10)

100-300mg/day with fat-containing meal

Preferred form for patients over 40 or with poor conversion; better absorbed

Ubiquinone (oxidized CoQ10)

100-400mg/day with fat-containing meal

Standard form; adequate for most patients under 40 with good mitochondrial function

Statin depletion repletion

100-200mg ubiquinol/day minimum

Higher doses (200-300mg) for significant myopathy symptoms

Drug interactions

Warfarin — CoQ10 may reduce warfarin efficacy (structural similarity to vitamin K2); monitor INR when starting or stopping

Statins — statins deplete CoQ10 by inhibiting the same mevalonate pathway; this is the therapeutic indication, not a harmful interaction

Beta blockers — some beta blockers may reduce CoQ10 levels; supplementation may be warranted

Chemotherapy agents (doxorubicin) — CoQ10 may be cardioprotective; discuss with oncologist

Contraindications

No absolute contraindications at standard doses

Use with caution in patients on anticoagulants (monitor INR)

Labs to monitor

Plasma CoQ10 levels (if available)CK (if myopathy present)INR (if on warfarin)Liver enzymes (baseline with statin use)

Mechanism of action

CoQ10 (ubiquinone) functions as an electron carrier in the mitochondrial electron transport chain (Complex I-III) and as a lipid-soluble antioxidant. Statins inhibit HMG-CoA reductase, which is upstream of both cholesterol and CoQ10 synthesis — the depletion is mechanistically unavoidable with statin use. Ubiquinol is the active, reduced form that directly participates in cellular energy production.

Clinical note

The ubiquinol vs ubiquinone distinction matters more in older patients. Conversion of ubiquinone to the active ubiquinol form declines with age and with mitochondrial dysfunction — the patients who most need CoQ10 are often the least able to convert it. Prescribe ubiquinol for patients over 40, those with ME/CFS or significant fatigue, and all statin users with myopathy.

Conditions commonly using CoQ10 (Ubiquinol)

Chronic Fatigue Syndrome (ME/CFS)

View protocol

Fibromyalgia

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Type 2 Diabetes

View protocol

Commonly combined with

MagnesiumVitamin DNAC (N-Acetyl Cysteine)

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