Cordyceps and Athletic Performance: The Evidence Behind the Claims

Cordyceps became famous when Chinese athletes credited it for record-breaking performances in 1993. Here's what the actual research shows about VO2max, ATP production, and endurance.

The 1993 World Championships and the Cordyceps Controversy

In August 1993, Chinese middle-distance runners broke three world records at the World Championships in Stuttgart. Their coach, Ma Junren, attributed the performances to a training regimen that included cordyceps mushroom supplementation. The claim sparked both global interest in cordyceps and significant scepticism — was this a genuine ergogenic effect, or a convenient cover story for other performance-enhancing interventions?

Thirty years later, the research has produced a more nuanced answer. Cordyceps does appear to have measurable effects on aerobic metabolism and exercise performance — but the magnitude is modest, the mechanisms are specific, and the evidence is stronger for some populations than others.

The Mechanism: Adenosine and ATP

Cordyceps (Cordyceps sinensis and the cultivated Cordyceps militaris) contains cordycepin (3'-deoxyadenosine), a structural analogue of adenosine that has multiple effects on cellular energy metabolism. The primary proposed mechanism for athletic performance is enhancement of adenosine triphosphate (ATP) synthesis — the molecule that powers all cellular activity including muscle contraction.

A 2004 study in the Journal of Alternative and Complementary Medicine found that cordyceps supplementation increased ATP production in isolated mitochondria by approximately 28%. A 2010 animal study found that cordyceps-supplemented mice showed significantly greater endurance on treadmill tests and higher post-exercise ATP levels in skeletal muscle compared to controls.

Cordyceps also appears to increase the efficiency of oxygen utilisation. Several studies have found that cordyceps supplementation increases VO2max — the maximum rate of oxygen consumption during exercise — which is one of the strongest predictors of aerobic endurance performance.

Human Clinical Evidence

The most rigorous human trial was published in 2010 in the Journal of Alternative and Complementary Medicine. Twenty elderly subjects (average age 65) were randomised to receive either cordyceps extract or placebo for 12 weeks. The cordyceps group showed a 7% increase in VO2max compared to a 1.5% increase in the placebo group — a statistically significant difference. The effect was larger in subjects with lower baseline fitness.

A 2017 study in healthy young adults found that 3 weeks of cordyceps supplementation produced a modest but significant improvement in time to exhaustion during a cycling test (2.5% improvement vs placebo). The effect size was smaller than in the elderly population, consistent with the hypothesis that cordyceps benefits are larger when baseline mitochondrial function is lower.

A 2020 meta-analysis in Evidence-Based Complementary and Alternative Medicine reviewed 8 controlled trials and found a small but consistent positive effect of cordyceps on aerobic performance metrics, with the strongest effects in older adults and people with lower baseline fitness.

Practical Dosing

The doses used in clinical trials range from 1–3g/day of cordyceps extract. Cordyceps militaris (the cultivated species) has higher cordycepin content than wild-harvested Cordyceps sinensis and is the species used in most modern research. Effects on exercise performance typically emerge at 3–4 weeks of consistent supplementation. Cordyceps is generally taken in the morning or pre-workout.

This article is for informational purposes only and does not constitute medical advice. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your physician before making any changes to your health regimen.