Cordyceps
In short
Summary of findings for quick reference
The traditional caterpillar fungus Ophiocordyceps sinensis comes from the Tibetan Plateau and Himalayas. The mummified caterpillar and fungus are often used together. A fifteenth-century Tibetan passage reproduced by Winkler describes an aphrodisiac use; the Chinese Ben Cao Cong Xin of 1757 records lung- and kidney-related uses. These historical statements are not modern evidence of treatment efficacy.
Traditional use is also documented in Sikkim, India. Modern products require attention to composition: C. militaris, fermented Cs-4 mycelium and wild-collected caterpillar fungus are different materials. Cultivation avoids wild collection but does not automatically make a product vegan. The substrate and all ingredients matter.
Clinical exercise findings are mixed. A small Cs-4 pilot study found no improvement in maximal oxygen uptake. A six-mushroom blend showed a signal only in a small exploratory extension. This supports neither a general endurance claim nor a common dose for all cordyceps products.
Clinical evidence ↔ Historical significanceWe display two separate evidence categories: clinical evidence from modern trials and historical significance from documented healing tradition. Both are valuable, but they answer different questions.Read more
In every encyclopedia entry we evaluate two distinct categories of evidence. Clinical evidence as used in trials meets a narrower but scientifically essential bar. At the same time, the hundreds of thousands of plant species worldwide have only partially been captured and tested in modern studies.
Alongside the trial picture our researchers compile a comprehensive overview of where and since when a plant has been used across different traditions of natural medicine. When a plant has been used as a medicinal plant in many cultures across many generations, that historical significance deserves to be visible too.
Our position: a truly informative overview emerges only when both categories sit side by side. We communicate transparently what counts as what.
Overview
Several different fungal preparations are sold as cordyceps. The traditional caterpillar fungus Ophiocordyceps sinensis, formerly Cordyceps sinensis, grows from an infected moth caterpillar in the Tibetan Plateau and Himalayas. Cordyceps militaris is a separate species that can be cultivated on substrates including rice. Fermented mycelial products such as Cs-4 are also available. These forms differ in origin, production and composition; results for one preparation do not automatically apply to another.
In traditional Chinese medicine (TCM), the wild caterpillar fungus is called Dong Chong Xia Cao, or “winter worm, summer grass”. It is used as a tonic associated with the kidney and lung functional systems. These are TCM concepts, not demonstrated effects on those organs. Research investigates constituents including cordycepin and polysaccharides. Small clinical studies report mixed exercise results and do not establish a general endurance benefit from cordyceps.
History
The caterpillar fungus has been used in Tibetan medicine for centuries. Daniel Winkler’s 2008 paper reproduces a translated passage by the fifteenth-century physician Nyamnyi Dorje describing it as an aphrodisiac. It later appears in Chinese materia medica: the 1757 Ben Cao Cong Xin describes uses associated with the lungs and kidneys. The name “winter worm, summer grass” reflects its appearance: a slender fungal fruiting structure emerges from the colonized caterpillar. Preparations cooked with chicken or duck are also documented.
Trade in wild caterpillar fungus is an important source of income for many highland communities. High demand and collection pressure affect wild populations; a 2018 study also links their decline to climate warming. Cultivated fungal preparations do not require this wild collection. Examples include C. militaris and Cs-4, a fermentation product from the mycelial strain identified in the trial as Paecilomyces hepiali. Cs-4 is neither wild-collected caterpillar fungus nor C. militaris. The Tibetan history of use therefore cannot simply be transferred to these preparations.
Mechanism
Research focuses on constituents including cordycepin and various polysaccharides. Cordycepin is 3′-deoxyadenosine, an adenosine-like nucleoside known from C. militaris. Its content depends on species, strain and culture conditions. Cell and animal studies investigate effects on metabolic and signalling pathways. Polysaccharide fractions also affect immune cells in these models. Such findings describe laboratory effects, not established benefits of an arbitrary cordyceps product.
Sports research asks whether particular preparations influence energy metabolism or oxygen use. Proposed mechanisms rely mainly on cell and animal experiments. They do not establish a reliable performance benefit in humans. A high cordycepin or polysaccharide content alone does not demonstrate clinical efficacy.
Chen and colleagues studied three grams of Cs-4 daily for twelve weeks in 2010. Of 20 randomized healthy adults aged 50 to 75, 15 completed the study. Individual exercise thresholds improved from baseline, but the overall analysis found no difference between groups and maximal oxygen uptake (VO2max) was unchanged. Hirsch and colleagues studied four grams of a six-mushroom blend containing C. militaris in 2017. In 28 young, recreationally active adults, one week produced no advantage over placebo. An exploratory extension involving only ten people found a VO2max difference after three weeks. This cannot establish an effect of C. militaris alone.
Small samples, short durations and different preparations limit these studies. They establish neither a general endurance benefit nor a benefit confined to older or untrained people. The review by Tuli and colleagues (2014) mainly discusses biological effects and possible mechanisms of cordycepin. It does not establish clinical efficacy for the products described here.
Evidence
| Outcome | Class | Grade | Effect | Studies | Refs |
|---|---|---|---|---|---|
| Exercise performance with particular cultivated preparationsChen’s Cs-4 pilot trial (2010) found improved thresholds from baseline among 15 completers, but no difference in the overall analysis and no higher VO2max. Hirsch (2017) tested a six-mushroom blend containing C. militaris: no placebo advantage after one week in 28 people, and a VO2max signal after three weeks in only ten. These findings establish neither a general cordyceps effect nor an effect of C. militaris alone.Healthy adults aged 50 to 75; young recreationally active adults | EmergingEmerging research. Early small trials suggest an effect but await replication. | DEvidence quality grade D. Preliminary signal. A single small trial, pilot result, or laboratory or animal model. Clinical relevance unclear. This is an evidence rating, not a product endorsement. | Mixed Effect | [1][2] | |
| Traditional kidney and lung tonic use (TCM)The 1757 Ben Cao Cong Xin describes caterpillar fungus in connection with the lungs and kidneys. Tonic preparations cooked with chicken or duck are also documented. These traditional functional systems do not directly correspond to modern organ diagnoses. The historical record documents use, not efficacy of a modern cultivated preparation.Traditional TCM use of wild caterpillar fungus | TraditionalTraditional use. Long-standing folk practice or EMA HMPC traditional-use monograph. | DEvidence quality grade D. Preliminary signal. A single small trial, pilot result, or laboratory or animal model. Clinical relevance unclear. This is an evidence rating, not a product endorsement. | Traditional Use | ||
| Traditional use for respiratory complaintsChinese sources and the Sikkim field study document use of wild caterpillar fungus for cough and other respiratory complaints. These are historical or ethnographic reports. Cell and animal experiments on individual constituents are a different form of research and do not clinically confirm these uses.TCM traditional use | TraditionalTraditional use. Long-standing folk practice or EMA HMPC traditional-use monograph. | DEvidence quality grade D. Preliminary signal. A single small trial, pilot result, or laboratory or animal model. Clinical relevance unclear. This is an evidence rating, not a product endorsement. | Traditional Use | [4] | |
| Immune cell signalling (in vitro and animal)Various polysaccharide fractions and cordycepin are investigated for effects on immune cells. Tuli and colleagues’ 2014 review mainly describes biological activity and proposed mechanisms. Laboratory findings establish neither a health benefit in humans nor a common effect across all cordyceps preparations.In vitro and animal models | TraditionalTraditional use. Long-standing folk practice or EMA HMPC traditional-use monograph. | DEvidence quality grade D. Preliminary signal. A single small trial, pilot result, or laboratory or animal model. Clinical relevance unclear. This is an evidence rating, not a product endorsement. | Preclinical Data | [3] |
Usage
Forms and preparation
Cordyceps is sold as powder, capsules or liquid extract. The label should identify the fungal species, strain where applicable, and material used: fruiting body, mycelium or mycelium with its cultivation substrate. Cs-4 is a particular fermentation product and is not C. militaris. Extraction also affects composition; dual water-and-alcohol extraction alone does not demonstrate efficacy. Historical preparations include wild-collected caterpillar fungus cooked with chicken or duck. Modern powders or extracts cannot be treated as equivalent quantities. Whether a cultivated preparation is vegan depends on the culture substrate and other ingredients such as the capsule shell. The name C. militaris alone is insufficient.
Dosage
The studied amounts were preparation-specific: Chen and colleagues used three grams of Cs-4 per day in three divided doses for twelve weeks. Hirsch and colleagues tested four grams of a six-mushroom blend daily for one week. Ten people from the mushroom-blend and placebo groups participated in the extension to a total of three weeks. These are study protocols, not a general dose recommendation for C. militaris, wild material or arbitrary extracts. These studies do not establish a reliable performance-enhancing dose or an optimal time of day. A labelled cordycepin value does not make products equivalent. Follow the instructions for the particular preparation and discuss use with a clinician if you have a medical condition or take regular medication. The cited studies do not justify self-directed dose escalation.
Safety
Look-alikes
Similar plants and look-alikes
Other caterpillar fungi and related species
Caterpillar fungi comprise different insect-parasitic fungi. Similar wild specimens and differently named cultivated strains can differ in composition. The former genus Cordyceps has been taxonomically divided. Exact species, strain and processed material are therefore more informative than the umbrella term.
FAQs
What is the difference between wild Cordyceps sinensis and cultivated Cordyceps militaris?
Wild Ophiocordyceps sinensis is a fungus-caterpillar complex from the Tibetan Plateau and Himalayas. Cordyceps militaris is a separate species that can be cultivated, for example on rice. Cs-4 is a fermented mycelial preparation from a strain identified in the research as Paecilomyces hepiali. Composition and evidence differ; these forms are not automatically clinically equivalent.
What is cordycepin and what does it do?
Cordycepin is 3′-deoxyadenosine, an adenosine-like nucleoside obtained from C. militaris and investigated for biological activity. Concentration depends on strain, substrate and processing. A declared content characterizes a product but does not demonstrate better endurance or other health benefits. The cited studies do not establish a generally effective minimum concentration of 0.2%.
Should I take cordyceps before training?
The cited studies do not support taking cordyceps 30 to 60 minutes before exercise. Chen studied Cs-4 for twelve weeks and Hirsch studied a mushroom blend for one or three weeks. These trials do not establish an optimal time before an individual workout or document a traditional Asian pre-workout regimen.
Is cordyceps vegan?
Wild-collected Ophiocordyceps sinensis is used together with the mummified caterpillar and is not vegan. Cultivated C. militaris can be produced vegan but can also be cultivated on animal material. Culture substrate, animal-derived additives and other ingredients such as capsule shells matter. Look for a substantiated vegan declaration; the species name alone is insufficient.
4 sources.
- Chen S, Li Z, Krochmal R, Abrazado M, Kim W, Cooper CB. Effect of Cs-4 (Cordyceps sinensis) on exercise performance in healthy older subjects: a double-blind, placebo-controlled trial. 2010. doi:10.1089/acm.2009.0226
- Hirsch KR, Smith-Ryan AE, Roelofs EJ, Trexler ET, Mock MG. Cordyceps militaris improves tolerance to high intensity exercise after acute and chronic supplementation. 2017. doi:10.1080/19390211.2016.1203386
- Tuli HS, Sandhu SS, Sharma AK. Pharmacological and therapeutic potential of Cordyceps with special reference to Cordycepin. 2014. doi:10.1007/s13205-013-0121-9
- Panda AK, Swain KC. Traditional uses and medicinal potential of Cordyceps sinensis of Sikkim. 2011. doi:10.4103/0975-9476.78183
Legal notice: The depiction of historical significance and traditional use is context within our encyclopedia and not a health claim for any product, not a treatment promise, and not a substitute for medical advice. What may be stated on product labels, product pages, or in advertising is governed by the applicable legal requirements.