Cordyceps (Cordyceps militaris / sinensis)
Cordyceps is a medicinal fungus (cultivated Cordyceps militaris or the traditional Ophiocordyceps sinensis), standardised to cordycepin and adenosine, used for endurance, oxygen utilisation and general vitality. Some small human trials suggest modest improvements in aerobic capacity in older or untrained people, but data in trained athletes are weak and it is not a hormonal booster.
01 Overview
Proposed mechanisms include improved oxygen utilisation, ATP production and antioxidant effects, which underlie cordyceps' traditional use as a stamina tonic. A few controlled trials, often using a fermented CS-4 mycelium product, report small gains in VO2max or ventilatory threshold in older or sedentary subjects, while trials in fit young athletes generally show no meaningful benefit.
Users take mushroom extract or fermented mycelium for endurance, recovery and vitality. It is generally well tolerated. Practical concerns are product quality (wild sinensis is scarce and expensive, so most products are cultivated militaris or mycelium), possible heavy-metal accumulation in some sources, and mild GI upset. Traditional testosterone/libido claims rest mainly on animal data.
02 Mechanism
Fungal extract (cordycepin, adenosine, polysaccharides) proposed to enhance oxygen utilisation, ATP turnover and antioxidant defence, improving aerobic capacity in some populations.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Fruiting-body / mycelium extract | 1000–3000 mg/day | Oral | Common supplemental range; standardisation to cordycepin varies. |
| Higher endurance dosing | 3000–4500 mg/day | Oral | Upper range used in some aerobic-performance studies. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Modest aerobic-capacity improvementSmall trials show improved VO2max or ventilatory threshold in older or untrained subjects; little effect in trained athletes. | small | Clinical | |
| Reported vitality / fatigue benefitTraditional and anecdotal use for stamina and reduced fatigue. | subjective | Observational |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Gastrointestinal upsetNausea, dry mouth or diarrhoea in some users. | Mild | Uncommon | Observational | |
| Contamination / heavy metalsSome wild and poorly sourced products carry heavy metals; potency and identity vary widely. | Moderate | Product-dependent | Observational |