CoQ10 supplementation: limited and inconsistent effects on exercise performance
Systematic review and meta-analysis
Design
6 databases, 24 randomised placebo-controlled studies published up to November 2025, healthy adults; outcomes: exercise performance, subjective fatigue, circulating CoQ10. Risk of bias with RoB2, certainty with GRADE.
Key Results
| Metric | Effect |
|---|---|
| Blood CoQ10 | consistently ↑ (robust biochemical response) |
| Chronic intake → performance | small benefit in primary analyses; no longer stable after outlier exclusion |
| Acute intake → performance | no benefit; trivial after outlier exclusion |
| Aerobic endurance (chronic subgroup) | significant in primary analyses, borderline after outlier exclusion |
| Anaerobic and strength outcomes | little change |
| Subjective fatigue | suggestive reduction, more consistent after outlier exclusion |
| Trained individuals | benefits unstable; consistent only after outlier exclusion |
| Dose / duration | no stable dose-response pattern |
Findings
CoQ10 reliably elevates blood concentration, but performance effects are small and inconsistent. Certainty: very low to low. Best case — a modest, context-dependent effect with chronic use.
Practical Application
Across 24 RCTs in healthy adults, CoQ10 consistently raised blood CoQ10 but gave at most a small, unstable performance benefit with chronic use and none with acute use; certainty very low to low. For a cyclist this is not an ergogenic supplement to plan around.
The one signal that strengthened after outlier exclusion was subjective fatigue — suggestive, not established; oxidative-stress or muscle-damage markers are not reported in the abstract.
Not from this paper; the base's own practice: spend the supplement budget on the well-evidenced options — caffeine REF-083 first.
Limitations
From the design as the abstract reports it: a meta-analysis of twenty-four randomised placebo-controlled trials in which heterogeneity and moderate-to-high risk of bias reduced certainty; overall certainty is very low to low (GRADE), per the authors.
Results were sensitive to outlier exclusion (the chronic effect was no longer stable), and all subgroup analyses were restricted to chronic supplementation.
The authors call for well-controlled trials that standardise formulation, dose and duration and examine sex-specific and endurance-related responses.
How this entry was checked and changed
Why this level
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Content correction 2026-09-27
Removed table rows "MDA significantly ↓" and "LDH, CK tendency ↓" and the recovery claim built on them -> the abstract reports no oxidative-stress or muscle-damage markers; it reports subjective fatigue, aerobic/anaerobic/strength subgroups and a trained-subgroup analysis, now shown.
Practical lead "NOT recommended" -> the study's actual result with its scope; "budget better spent on caffeine, NaHCO3, beta-alanine" -> labelled house practice, pointing to REF-083.
Sport line "cycling" -> "general" (healthy adults, mixed exercise); Tier line reworded.
2026-09-28: added Limitations from the abstract (Europe PMC PMID 41457257).