Cordyceps: Benefits, Dosage and Risks, According to Studies

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Cordyceps

A concentrated 4:1 extract of Cordyceps militaris, obtained from the fruiting body—that is, the mushroom itself and not the mycelium—in HPMC vegetable capsules. Two capsules per day provide 1,800 mg of 4:1 extract, in the morning or 30 to 60 minutes before exercise. Non-GMO, gluten-free, lactose-free, vegan. Bottle of 60 capsules, one month of treatment.See Cordyceps

In brief

The word "cordyceps" covers hundreds of species of fungi that parasitize insects; three types of preparations matter to consumers. Ophiocordyceps sinensis, long called Cordyceps sinensis, is the "caterpillar fungus" of Tibetan and Chinese medicine, the yartsa gunbu. It parasitizes butterfly larvae in high-altitude meadows of the Himalayas and cannot be cultivated in its entirety: manual and seasonal harvesting. In a study published in PNAS in 2018, collectors from four countries report declining production, attributed to habitat degradation, climate and especially overexploitation; the authors view it as one of the most expensive biological commodities in the world, which provides a livelihood for hundreds of thousands of collectors.

Cordyceps militaris is the cultivated species: it produces true orange fruiting bodies in a few weeks on controlled substrate and synthesizes much more cordycepin than sinensis. It is the form of most supplements sold in Europe and that of our Cordyceps, a 4:1 fruiting body extract.

Fermented mycelia form the third group: strains associated with wild fungus, cultivated in tanks, such as Cs-4, extracts of Paecilomyces hepiali and Chinese medical preparations of dried mycelium (Bailing, Jinshuibao, Corbrin). These, and not the wild fungus or militaris, provided most trials in renal, diabetic or cancer patients.

Three families of compounds are monitored: cordycepin (3'-deoxyadenosine), an adenosine analog isolated in 1950, with immunomodulatory and antiplatelet effects described in laboratory studies;adenosine and other nucleosides; polysaccharides, of variable structure depending on the strain and extraction method, which carry a large part of the immune activity measured in animals. Added to these are D-mannitol, ergosterol, carotenoids, GABA and ergothioneine (approximately 0.55 mg per gram of dry weight in militaris).

Cordycepin clearly distinguishes the species. In an HPLC-MS/MS analysis of ten samples, five authentic Ophiocordyceps sinensis and five substitute products, it represented only 0.0076 to 0.029% of the weight. A lyophilized fruiting body of C. militaris from a Vietnamese strain contained 14.43 mg per gram, or approximately 1.4%, and its ethanolic extract 69.15 mg per gram. The contents vary from one strain and cultivation method to another, hence the necessary analysis of each batch.

Mycelium on grain or fruiting body? Many inexpensive powders are "mycelium on grain": mushroom cultivated on rice or oats, then ground with its substrate. The most cited performance trial (Hirsch 2017) actually used a C. militaris mycelium cultivated on oats, substrate included, in a mixture of six mushrooms; by design, the cereal substrate, thus starch, is part of this type of product. Conversely, some C. militaris mycelia produced in liquid fermentation are rich in cordycepin. The mushroom part alone guarantees nothing; analysis matters. Our Cordyceps is a 4:1 extract of C. militaris fruiting body, without mycelium or substrate; its fact sheet does not indicate cordycepin or polysaccharide content, so we make no promises about them.

This is the domain where cordyceps sells the most and where trials contradict each other the most: everything depends on the form, duration and level of the participants.

This trial is therefore based on ten people and a mixture of six mushrooms. An older trial in seniors goes in the same direction: in 20 adults aged 50 to 75 in good health, 12 weeks of Cs-4 at 333 mg three times daily (1 g per day) increased the metabolic threshold by 10.5% (from 0.83 to 0.93 L per minute) and the ventilatory threshold by 8.5%, with no change under placebo; VO2max did not change in either group. The authors refer to this as a pilot study.

In 17 amateur competitive cyclists, two weeks of a commercial formula (1,000 mg of Cs-4 and 300 mg of rhodiola extract per three capsules, after a loading dose of 6 capsules daily for 4 days) modified neither peak VO2 (4.14 versus 4.10 L per minute), nor time to exhaustion, nor maximum power.

A 2026 narrative review examined five intervention studies with Cordyceps militaris in healthy subjects between 2017 and 2024: 321 participants aged 16 to 35, 1 to 12 g per day, 1 to 16 weeks. Its authors judge the results inconsistent: no study at low risk of bias, four out of five not registered, uncharacterized mixtures or preparations. Honest assessment: a favorable signal on exercise tolerance after at least 3 weeks in active non-competitive subjects, nothing demonstrated in endurance athletes. Our article on cordyceps and athletic performance reviews each trial; our analysis of 13 trials on rhodiola sheds light on combined formulas.

Three preparations show agreement in healthy adults. In 79 Korean men, 4 weeks of 1.5 g daily of Cordyceps militaris ethanol-treated, in capsules, increased NK cell activity more than placebo, lymphocyte proliferation and interleukin-2 and interferon gamma secretion, without significant adverse effects. In 40 Thai adults (10 men and 10 women per group), 8 weeks of a fermented C. militaris beverage providing 2.85 mg of cordycepin increased NK activity from baseline in men as early as 4 weeks, and compared to placebo in women at 8 weeks; blood glucose, lipids and safety markers remained unchanged.

These trials measure laboratory markers, not prevented infections: no one counted colds, a common limitation for "immunity" supplements, see our guide on immunity: what really works, alongside other functional mushrooms.

Recovery. In 22 endurance runners, 16 weeks of 1,800 mg daily of a C. militaris mycelium extract in preseason better preserved ferritin, hemoglobin and hematocrit than placebo, and lowered creatine kinase, a marker of muscle damage, at 16 weeks; race distances and times did not differ.

Fatigue. No randomized trial identified in PubMed measured perceived fatigue as a primary endpoint with cordyceps alone: the "anti-fatigue" reputation rests on tradition, animal studies and the indirect markers above. Persistent fatigue: see our guide to plants and nutrients validated against chronic fatigue.

For diabetic nephropathy, a meta-analysis of 51 trials (3,955 patients) compared Jinshuibao added to ACE inhibitors or sartans to these drugs alone: creatinine lowered by an additional 13.84 µmol/L, 24-hour proteinuria reduced, systolic blood pressure by 4.57 mmHg and fasting blood glucose by 0.85 mmol/L. These are intermediate markers, not progression to dialysis.

In kidney transplant recipients, the 2015 Cochrane review (5 studies, 447 recipients) finds, compared to azathioprine, no difference in graft or patient survival, but better graft function and possibly fewer acute rejections, anemia, leukopenia and liver damage; combined with a reduced dose of cyclosporine, cordyceps showed no difference from standard dose. Follow-up of one year maximum, risk of bias uncertain throughout.

The blood glucose reductions from renal meta-analyses (fasting blood glucose −0.85 mmol/L, HbA1c −0.52 points, total cholesterol and triglycerides −0.53 mmol/L in the synthesis of 51 trials on Jinshuibao) come from diabetics with nephropathy. The picture changes outside this context.

In the Thai trial of C. militaris drink in healthy adults, blood sugar and lipids also remained stable. High blood sugar: documented options are elsewhere, see our guide to plants and nutrients studied for blood sugar.

Testosterone and sexual function. The aphrodisiac reputation rests on animal studies. In rats made diabetic, 21 days of Cordyceps militaris at 100 mg per kilogram improved sperm, serum testosterone and copulatory behavior, by reducing testicular oxidative stress. No randomized trial in humans has measured testosterone or erectile function with cordyceps alone, and in 21 active young men, a multi-ingredient supplement based on rhodiola and Cordyceps sinensis taken for 14 weeks did not modify the hormonal profile. Our article on natural testosterone boosters explains why these extrapolations warrant caution.

Sleep and stress. Human data practically nonexistent. In ovariectomized and stressed female rats, a menopause model, injected cordycepin reduced sleep latency, increased slow-wave sleep and decreased depressive-like behaviors. In humans, cortisol decreased by 11% over 14 weeks in the combined training trial, equally under placebo as under the multi-ingredient supplement rhodiola and Cordyceps sinensis.

For sleep and nervous fatigue, trials mainly concern reishi (Ganoderma lucidum). In a multicenter double-blind trial in 132 neurasthenic patients, 8 weeks of a polysaccharide extract at 1,800 mg three times daily reduced fatigue sensation by 28.3%, versus 20.1% under placebo, and 51.6% of patients were considered improved versus 24.6%. A short trial, with a specific preparation, detailed along with others in our article on reishi benefits ; its precautions are in reishi: dangers and side effects.

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Reishi

A concentrated extract of Ganoderma lucidum, obtained from the fruiting body, in HPMC vegetable capsules. Two capsules per day, in the evening, approximately 30 minutes before bedtime, for a course of at least 30 days. GMO-free, gluten-free, lactose-free.View Reishi

Cancer.

Cordyceps is studied as an adjuvant, never as a treatment. A meta-analysis of 12 Chinese trials (928 patients, lung cancer) reports, as a complement to conventional treatments, a higher tumor response rate (relative risk 1.17), a better Karnofsky score (+8.20 points), less myelosuppression (relative risk 0.38) and radiation pneumonitis (0.74), with a subgroup at 6 g per day of medicinal preparations. In practice: never without the oncologist, never instead of treatment. Sought benefit

The search "cordyceps benefits for women" is frequent; the honest answer is brief: no oral trial was designed for women. The Thai trial on fermented C. militaris beverage analyzed the sexes separately: in the 10 women, NK cell activity increased compared to placebo at 8 weeks, with a decrease in interleukin-6. The 2017 trial on the militaris mycelium-based blend included participants of both sexes, without separate analysis. Nothing indicates that the effect differs by sex, although sample sizes do not allow us to confirm this, and the menopause model in female rats (cordycepin, sleep, mood) remains animal-based.

No official dose; trials provide guidelines, without mixing forms. Cs-4 and fermented mycelia : 1 g per day for 12 weeks in seniors, 3 g per day for 5 weeks in cyclists (no effect), 1.68 g of P. hepiali extract for 8 weeks (immunity). Cordyceps militaris : 1.5 g per day for 4 weeks (immunity), 4 g per day of a C. militaris mycelium blend cultivated on oats for 3 weeks (performance), 1,800 mg per day of mycelium extract for 16 weeks (runners). Chinese medical preparations : several grams per day, up to 6 g in oncology, under medical supervision.

Duration is the clearest parameter: in the 2017 trial, one week produced no significant difference from placebo, three weeks produced the effect on VO2max; immunity trials last 4 to 8 weeks, the one in seniors 12 weeks. A course of at least 30 days therefore makes sense. Timing of intake has not been compared: studies distributed it throughout the day or gave it all at once, often with a meal; nothing requires taking it on an empty stomach or away from coffee, a point not studied. Our Cordyceps is taken at a rate of 2 capsules per day, or 1,800 mg of 4:1 extract from C. militaris fruiting body, in the morning or 30 to 60 minutes before exercise; this amount matches the 1,800 mg of mycelium extract from the runner trial, but the preparation is different (4:1 concentrated fruiting body extract here, unknown ratio for the Japanese trial, 1.5 g mushroom powder for the Korean trial) and no trial has tested our product itself.

In trials, cordyceps is well tolerated. In 49 adults taking 1.05 g per day of freeze-dried mycelium of Cordyceps cicadae (related species) for 3 months, kidney and liver function, electrolytes and lipids did not change, with no adverse effects reported. In the Korean trial at 1.5 g of militaris, no significant adverse reactions; in the Thai trial, liver, kidney and blood markers remained normal. Mild digestive disturbances remain possible.

These cases illustrate the main danger: fraud, not the mushroom. Wild sinensis is so expensive that its supply chain is rife with errors of origin, substitutions, counterfeits and artificially "enhanced" products, according to a 2025 review on its traceability; the 2026 review on militaris also recalls supplements where anabolic steroids had replaced the mushroom. A traced product, tested for heavy metals and sold under the name of the cultivated species, escapes most of the risk.

Interactions. They are inferred from mechanisms and trials, not from published accidents. Anticoagulants and antiplatelet agents : an extract of C. militaris enriched in cordycepin inhibits platelet aggregation in rats and thrombus formation in mice, without modifying coagulation time; caution with these treatments and before surgery. Antidiabetic agents : the meta-analysis in renal patients shows reductions in blood glucose, hence monitoring during treatment. Immunosuppressants and autoimmune diseases : in China, cordyceps is used to modulate immunity in transplant recipients, and trials in healthy subjects stimulate NK cells; nothing is decided here without medical advice.

Price first. Wild sinensis cannot be fully cultivated, is hand-harvested for only a few weeks per year and its production is declining; its quality varies by region, hence highly variable prices and a counterfeit industry. Cultivated Cordyceps militaris is far less expensive, standardizable and much richer in cordycepin: for a supplement, wild has no documented advantage, but proven fraud risk.

Five criteria for reading a label. 1. The species, in Latin : Cordyceps militaris or Ophiocordyceps sinensis, and for fermented mycelia the strain name; "cordyceps" without species tells you nothing about the content. 2. The part used : fruiting body, pure mycelium or mycelium on grain, in which case the substrate is part of the product. 3. Extract or powder, and the ratio : a 4:1 extract means that 4 kg of raw material yielded 1 kg of extract; it concentrates the extractable compounds, without guaranteeing content by itself alone. 4. Analyzed content levels : cordycepin, adenosine or polysaccharides, with the method and batch number; an absence of figures is assumed, it cannot be compensated by a promise. 5. Origin and quality controls : cultivation location, tests for heavy metals, pesticides, microbiology, and for wild sinensis an authentication, given how frequent substitutions are.

What are the benefits of cordyceps according to studies?

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