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Cordyceps: What is this adaptogenic mushroom, and what can it really do?
April 28, 2026
In Tibetan history, this mushroom was called yartsa gunbu — "summer grass, winter worm" — because it parasitizes the caterpillars of certain high-altitude moths and grows out of their dead bodies as a small orange horn. Fascinating, a little unsettling, and exceptionally intensively researched by modern science.
Cordyceps is one of the medicinal mushrooms with the highest number of human clinical trials. No animal models, no in-vitro studies: randomized controlled trials on real people, published in peer-reviewed journals in 2024.
What is Cordyceps? Botany, History, and Names
The genus Cordyceps comprises over 600 species of entomopathogenic fungi. Two species are relevant to human health:
Ophiocordyceps sinensis (formerly Cordyceps sinensis): the original "Tibetan Cordyceps," hand-harvested on the Himalayan plateau at altitudes of 3,500 to 5,000 meters. It can exceed 20,000 euros per kilogram. The vast majority of inexpensive supplements calling themselves "Cordyceps sinensis" do not contain this species.
Cordyceps militaris: The species cultivable on plant substrates, widely available, used in the vast majority of European market preparations. It contains the same classes of active ingredients as Sinensis — often in higher and standardizable concentrations.
Active Ingredients of Cordyceps
Cordycepin (3'-deoxyadenosine): The most studied adenosine analog, with documented antiviral, anti-tumor, anti-inflammatory, and immunomodulatory properties.
Adenosine: Natural nucleoside with a role in vasodilation, heart rhythm regulation, and ATP synthesis.
Polysaccharides (beta-glucans, cordyglucans): Immunomodulatory, antioxidant, and hypoglycemic effects.
Cordycepic acid (D-mannitol): Bronchodilatory and nephroprotective effects in TCM.
Sterols, ergosterols, essential amino acids: Micronutrients with various metabolic functions.
The review published in Frontiers in Pharmacology 2021 (Das et al.) systematically cataloged the biological activities of the genus Cordyceps spp. (DOI: 10.3389/fphar.2020.602364)
Effects and Benefits of Cordyceps: What Do Studies Say?
Immunomodulation: the most well-documented mechanism
The most comprehensive and up-to-date review on this topic — published in Phytotherapy Research 2025 (Yang et al.) — systematically analyzed in-vitro, in-vivo, and clinical studies on the immunomodulatory effects of Cordyceps militaris. The results show bidirectional immunomodulatory effects. (DOI: 10.1002/ptr.70144)
A randomized controlled trial published in Scientific Reports in 2024 (Ontawong et al.) tested a fermented C. militaris drink on healthy volunteers over 8 weeks. Results: significant increase in NK cell activity in both genders, reduction of IL-1β and IL-6, without adverse effects. (DOI: 10.1038/s41598-024-58742-z)
Sports, Energy, and Muscle Regeneration
A randomized double-blind controlled trial published in Nutrients in 2024 (Nakamura et al.) administered C. militaris mycelium extract to professional marathon runners for 16 weeks. Results:
Serum ferritin levels increased in the CM group — statistically significant after 4 and 8 weeks.
Hemoglobin and hematocrit significantly higher in the CM group after 8 weeks.
Creatine kinase (marker of muscle damage) significantly reduced after 16 weeks. (DOI: 10.3390/nu16121835)
Contraindications: When Is Caution Advised?
Anticoagulant therapy (warfarin, DOAC): Cordycepin may have antiplatelet effects.
Pregnancy and breastfeeding: Insufficient safety data.
Autoimmune diseases with immunosuppressive therapy: potential interactions.
Upcoming surgeries: Discontinue at least 2 weeks before the procedure.
Mushroom allergy: Rare, but documented.
Immunosuppressants after transplantation: Potential interaction.
When Does Cordyceps Take Effect? Realistic Timelines
Immune response (NK cell activity): Significant changes after 4 weeks.
Iron stores and athletic endurance: Initial differences after 4–8 weeks.
Reduction of muscle damage: Effects after 16 weeks of continuous use.
Subjective energy: Traditional medicine and observational studies suggest 3–4 weeks.
How to Recognize a High-Quality Cordyceps Extract?
Cordycepin titration: typically 0.1–1%. Missing information = not standardized.
Polysaccharide titration: At least 20–30% declared and verifiable.
Clearly declared species: Cordyceps militaris or Ophiocordyceps sinensis.
Fruiting body or mycelium: Fruiting bodies tend to have higher cordycepin concentrations.
No unnecessary additives: No magnesium stearate, no fillers.
HPMC capsule: plant-based capsule.
Cordyceps The Last of Us and Cordyceps unilateralis: the same fungus?
Cordyceps unilateralis (now Ophiocordyceps unilateralis) is the fungus that infects Camponotus ants and manipulates their behavior. Yes, it really exists. No, it does not infect humans.
The Last of Us is a science fiction series that envisions a mutant Cordyceps. Narratively effective, biologically imaginative. The fungi used in supplements have nothing in common with O. unilateralis.
Would you like to try Cordyceps as a standardized dry extract, free of unnecessary additives?
Discover Cordyceps Oravita by RedMoringa — Cordyceps militaris extract with certified Cordycepin and polysaccharides, HPMC capsules, made in Italy.
Yang EJ et al. (2025). Cordyceps militaris and Its Constituents. Phytother Res. DOI: 10.1002/ptr.70144
Nakamura A et al. (2024). Effect of Cordyceps militaris Mycelium Extract on Blood Markers for Anemia in Long-Distance Runners. Nutrients. DOI: 10.3390/nu16121835
Ontawong A et al. (2024). Randomized controlled clinical trial: Cordyceps militaris beverage and immune response. Sci Rep. DOI: 10.1038/s41598-024-58742-z
Das G et al. (2021). Cordyceps spp.: A Review on Its Immune-Stimulatory and Other Biological Potentials. Front Pharmacol. DOI: 10.3389/fphar.2020.602364
This content is for informational purposes only and does not replace medical advice. Please consult your doctor or pharmacist before taking any supplements.