Yeast Beta-Glucan Supplementation with Multivitamins Attenuates Cognitive Impairments in Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Randomized, Double-Blind, Placebo-Controlled Trial.
Lacasa, Marcos, Alegre-Martin, Jose, Sentañes, Ramon Sanmartin et al. · Nutrients · 2023 · DOI
Quick Summary
This study tested whether a supplement made from yeast beta-glucan combined with vitamin D, B6, and zinc could help people with ME/CFS feel less mentally tired and think more clearly. Over 36 weeks, 65 ME/CFS patients took either the supplement or a placebo pill, and researchers measured changes in cognitive fatigue using a standard questionnaire. The group taking the beta-glucan supplement showed meaningful improvement in mental fatigue compared to the placebo group.
Why It Matters
Cognitive dysfunction and mental fatigue are hallmark symptoms of ME/CFS that significantly impair patients' daily functioning and quality of life. This is the first controlled trial suggesting that beta-glucan supplementation may provide symptomatic relief, potentially offering ME/CFS patients an accessible nutritional intervention to explore alongside standard care.
Observed Findings
Cognitive fatigue (FIS-40 scores) improved significantly in the beta-glucan group compared to placebo after 36 weeks (p=0.0338).
The treatment group received 250 mg daily beta-glucan combined with 3.75 µg vitamin D3, 1.05 mg vitamin B6, and 7.5 mg zinc.
The study maintained double-blind design with 65 participants across two arms (35 active, 30 placebo).
The trial duration was 36 weeks, suggesting measurement of both acute and sustained effects.
Inferred Conclusions
Yeast-derived beta-glucan may alleviate cognitive fatigue symptoms in ME/CFS patients.
Beta-glucan could potentially be used as a nutritional supplement or functional food to reduce cognitive dysfunction in ME/CFS.
Immunomodulatory or metabolic mechanisms related to beta-glucans warrant further investigation in ME/CFS pathophysiology.
Remaining Questions
Did the vitamin D, B6, and zinc contribute to the observed effect, or was beta-glucan the active component?
What are the underlying immunological or metabolic mechanisms by which beta-glucan reduces cognitive fatigue in ME/CFS?
Do improvements persist beyond 36 weeks, and what is the optimal dosing?
What This Study Does Not Prove
This study does not prove that beta-glucan works, only that it showed statistical improvement over placebo in one measurement. It does not establish the mechanisms by which beta-glucan might help, nor does it prove the effect would be sustained long-term or work for all ME/CFS patients. The study's modest sample size and single-center design limit generalizability.