Maes, Michael, Mihaylova, Ivanka, Kubera, Marta et al. · Neuro endocrinology letters · 2009
This study found that people with depression have lower levels of Coenzyme Q10 (CoQ10), a natural substance in the body that helps protect cells from damage, compared to healthy people. The researchers discovered that people with depression who don't respond well to treatment and those with chronic fatigue had even lower CoQ10 levels. This suggests that CoQ10 might play a role in why some people with depression feel persistently tired and why depression can increase heart disease risk.
For ME/CFS patients, this finding is significant because it identifies a potential biological marker—low CoQ10—that may explain both the treatment resistance seen in some depression cases and the persistent fatigue accompanying depression. Since CoQ10 is an antioxidant involved in energy production and cardiovascular protection, understanding its role could inform targeted interventions and explain why depressed ME/CFS patients face elevated cardiovascular risk.
This study does not prove that low CoQ10 causes depression or ME/CFS; it only shows an association. The cross-sectional design cannot establish whether low CoQ10 precedes illness onset or develops as a consequence of depression. The study also does not demonstrate that CoQ10 supplementation would improve depression or fatigue symptoms, only that it may be beneficial based on CoQ10's known biological properties.
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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