Heap, L C, Peters, T J, Wessely, S · Journal of the Royal Society of Medicine · 1999 · DOI
This study tested whether people with ME/CFS have lower levels of three B vitamins (B6, B2, and B1) compared to healthy people. Researchers measured how well these vitamins work in red blood cells from 12 ME/CFS patients and 18 healthy controls. They found that all three B vitamins appeared to be functioning less effectively in ME/CFS patients, suggesting a possible vitamin deficiency that might contribute to symptoms.
B vitamins are essential for energy metabolism and cellular function, both known to be compromised in ME/CFS. If ME/CFS patients truly have reduced functional B vitamin status, this could explain some fatigue symptoms and might inform treatment approaches, though this finding requires replication before clinical recommendations can be made.
This study does not prove that B vitamin deficiency causes ME/CFS or that B vitamin supplementation will improve symptoms. The correlation observed does not establish causation, and the small sample and cross-sectional design prevent any definitive conclusions about whether supplementation would help individual patients.
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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