Kuo, Yao-Haur, Tsai, Wei-Jern, Loke, Soy-Hwee et al. · Journal of ethnopharmacology · 2009 · DOI
This study tested whether a natural plant supplement called Astragalus membranaceus flavonoids (AMF) could help rats with chronic fatigue caused by stress and food restriction. The rats that received AMF showed improvements in immune function, better energy for swimming, and restored normal immune system balance compared to untreated fatigued rats.
Immune dysfunction is hypothesized to contribute to ME/CFS in humans, and this study identifies a potential mechanism—abnormal Th1-dominated responses—and demonstrates that a plant-derived compound may restore immune balance and improve fatigue. If validated in human research, such findings could guide development of immune-targeted therapeutics for ME/CFS.
This is a preclinical rat model study and does not establish efficacy in humans with ME/CFS; animal stress models do not fully replicate human disease pathophysiology. The study cannot prove that isoflavones directly cause improved fatigue or that immune imbalance is the primary driver of CFS in patients. Causality between cytokine rebalancing and endurance recovery cannot be definitively established from these data alone.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Kuo, Yao-Haur, Tsai, Wei-Jern, Loke, Soy-Hwee, Wu, Tian-Shung, & Chiou, Wen-Fei (2009). Astragalus membranaceus flavonoids (AMF) ameliorate chronic fatigue syndrome induced by food intake restriction plus forced swimming.. Journal of ethnopharmacology. https://doi.org/10.1016/j.jep.2008.11.025
BibTeX
@article{mecfsatlas-kuo-2009-astragalus-membranaceus,
author = {Kuo, Yao-Haur and Tsai, Wei-Jern and Loke, Soy-Hwee and Wu, Tian-Shung and Chiou, Wen-Fei},
title = {Astragalus membranaceus flavonoids (AMF) ameliorate chronic fatigue syndrome induced by food intake restriction plus forced swimming.},
journal = {Journal of ethnopharmacology},
year = {2009},
doi = {10.1016/j.jep.2008.11.025},
note = {PubMed: 19103273},
url = {https://www.mecfsatlas.com/evidence/kuo-2009-astragalus-membranaceus},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/kuo-2009-astragalus-membranaceus
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