E1 ReplicatedModerate confidencePEM unclearRCTPeer-reviewedReviewed
Effect of Dietary Coenzyme Q10 Plus NADH Supplementation on Fatigue Perception and Health-Related Quality of Life in Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Prospective, Randomized, Double-Blind, Placebo-Controlled Trial.
Castro-Marrero, Jesús, Segundo, Maria Jose, Lacasa, Marcos et al. · Nutrients · 2021 · DOI
Quick Summary
This study tested whether taking two supplements together—coenzyme Q10 and NADH—could help reduce fatigue and improve quality of life in people with ME/CFS. Over 200 patients took either the supplements or a placebo for 12 weeks. The group taking the supplements reported feeling less mentally tired, slept better, and experienced improvements in their overall quality of life compared to the placebo group.
Why It Matters
ME/CFS currently has no approved treatments, making any evidence-based intervention potentially valuable for patients with severely limited treatment options. This study suggests a well-tolerated, accessible supplement combination may offer meaningful symptom relief, particularly for cognitive fatigue—a hallmark feature of ME/CFS that significantly impacts daily functioning.
Observed Findings
- Cognitive fatigue perception significantly decreased in the supplement group over 12 weeks (p<0.001)
- Overall FIS-40 fatigue scores improved in the treatment group (p=0.022)
- Sleep duration increased at 4 weeks in the supplement group (p=0.018)
- Habitual sleep efficiency improved at 8 weeks in the supplement group (p=0.038)
- Health-related quality of life improved on SF-36 measures in the treatment group (p<0.05)
Inferred Conclusions
- CoQ10 plus NADH co-supplementation may be a safe therapeutic option for reducing perceived cognitive fatigue in ME/CFS patients
- The combination appears to produce measurable improvements in sleep quality and health-related quality of life over a 12-week period
- These supplements warrant further investigation as potential adjunctive interventions for ME/CFS symptom management
Remaining Questions
- What are the biological mechanisms by which CoQ10 and NADH reduce fatigue and improve sleep in ME/CFS patients?
- Do the observed improvements persist beyond 12 weeks, and what is the optimal duration and dosage of treatment?
What This Study Does Not Prove
This study does not prove CoQ10 and NADH are universally effective or curative; benefits were modest and measured through patient perception rather than objective biomarkers. The mechanism by which these supplements might work remains unexplained, and it does not establish whether benefits persist beyond the short study period or in different ME/CFS patient populations.
Tags
Symptom:Cognitive DysfunctionUnrefreshing SleepFatigue
Biomarker:Metabolomics
Method Flag:Weak Case DefinitionExploratory OnlyPEM Not Defined
Metadata
- DOI
- 10.3390/nu13082658
- PMID
- 34444817
- Review status
- Editor reviewed
- Evidence level
- Replicated human evidence from multiple independent studies
- Last updated
- 12 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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