Ingredient label guide

Cordyceps CS-4: Identity, Evidence, Dose, and Label Guide

CS-4 is a named cultured mycelial material, not a generic synonym for every Cordyceps supplement. Check the exact identity, amount per full serving, preparation wording, and whether the cited research actually tested CS-4.

Also listed as: CS-4, CS4, Cordyceps sinensis CS-4, or CordyMax Cs-4. Older research may refer to the CS-4 fungus as Paecilomyces hepiali; today it is classified as Samsoniella hepiali.

NutriDetector Editorial Team Updated August 24, 2026 Editorial Policy

Overview

The four characters CS-4 identify a particular material, not the whole Cordyceps category

CS-4 is a cultured fungal mycelial material developed as an alternative to scarce wild Chinese cordyceps. Human trials commonly describe it using the historical name Cordyceps sinensis or the commercial wording CordyMax Cs-4. Modern genetic research now classifies the associated fungus as Samsoniella hepiali, formerly Paecilomyces hepiali. ¹

This page focuses on CS-4 as a named supplement material. The broader Cordyceps supplement guide explains the full category, while the Cordyceps militaris guide covers the separately cultivated species. Keeping those pages separate prevents evidence from one material being assigned to another merely because all three use the word Cordyceps.

Identity and naming

Older Cordyceps names can refer to very different materials

The historical name Cordyceps sinensis now refers to the wild fungus-insect complex classified as Ophiocordyceps sinensis. CS-4 is not that harvested wild material. A 2020 genetic classification study reassigned the CS-4-associated Paecilomyces hepiali to Samsoniella hepiali. ^{1, 2}

Cordyceps militaris is another species used in cultivated fruiting-body, mycelial, fermented, and extract products. A C. militaris product may be legitimate and well disclosed, but it is not CS-4 and cannot automatically inherit CS-4 trial results.

What common Cordyceps wording actually establishes

Cordyceps sinensis CS-4: The named cultured CS-4 material is disclosed using historical commercial terminology. It should not be presented as harvested wild O. sinensis.
CordyMax Cs-4: A named CS-4 product reference is present. The full serving amount and formula still need to be checked.
Cordyceps sinensis mycelium: Cultured mycelium is indicated, but this wording alone may not establish the specific CS-4 material or match a CS-4 trial.
Cordyceps militaris: A separate species is named. Review its own material, preparation, marker disclosure, and evidence rather than using CS-4 research.
Cordyceps extract: The species, fungal material, and named preparation remain unclear. A generic category term is not enough to establish CS-4 identity.

Material and preparation

CS-4 is a cultured mycelial preparation, not a fruiting-body claim

Mycelium is the network of fungal filaments grown in a culture system. A fruiting body is the reproductive structure commonly recognized as a mushroom. CS-4 research concerns a named cultured mycelial material, so the absence of a fruiting-body claim does not make an authentic CS-4 label defective.

The opposite shortcut is also unreliable. The words cultured, fermented, or mycelium do not prove that an unnamed product is CS-4. The strongest connection to CS-4 evidence comes from explicit named material wording together with a disclosed amount and preparation.

Mycelial culture

This fits the broad CS-4 material type. It still needs an explicit CS-4 identity if the product wants to rely on CS-4 research.

Fermentation product

Fermentation describes production context. It is not a species, strain, dose, or clinical-equivalence statement by itself.

Extract ratio

A ratio such as 10:1 requires the real extract amount and a clear starting-material basis. It does not prove equivalence to CS-4 trials.

Polysaccharides or adenosine

Marker disclosure can add compositional context, but no single percentage converts an unidentified Cordyceps product into CS-4 or guarantees a human outcome.

Dose and label math

Study amounts describe named protocols, not one universal Cordyceps dose

In a 12-week pilot trial, 20 adults aged 50 to 75 took 333 mg of CS-4 three times daily, or 999 mg per day. In a five-week trial, 22 endurance-trained male cyclists took 3 g per day of CordyMax Cs-4. The trials studied different populations and outcomes and did not produce the same performance story. ^{3, 4}

Those numbers are evidence context, not a personal target. A label must first establish that its material is actually CS-4 and state how much the full serving provides. A generic powder, concentrated extract, raw-equivalent figure, and hidden blend amount should not be compared as though every milligram describes the same material.

Illustrative CS-4 label lines

These examples explain label structure. They are not product or dose recommendations.

Cordyceps sinensis CS-4 mycelium culture, 1,000 mg: The named material and full-serving amount are disclosed. The line does not prove that this finished product matches every research preparation or produces a clinical result.
CordyMax Cs-4, 1,000 mg, serving size 2 capsules: The complete two-capsule serving supplies 1,000 mg, not 1,000 mg per capsule unless the label explicitly says so.
Cordyceps sinensis mycelium extract 10:1, 500 mg: The extract amount and ratio are shown, but CS-4 identity is not established merely by the historical species wording or ratio.
Mushroom energy blend, 2,000 mg, including CS-4: Two thousand milligrams is the total blend weight. The individual CS-4 amount remains unknown and should not be guessed.

Evidence and claims

Limited exercise findings do not support a universal endurance claim

Older adults

The 12-week pilot reported changes in metabolic and ventilatory thresholds, but VO2 max did not change. Twenty participants are not enough to establish a broad performance outcome. ³

Trained cyclists

Three grams daily for five weeks did not improve VO2peak, ventilatory threshold, or cycling time-trial performance in 22 endurance-trained male cyclists. ⁴

ATP and cellular energy

Mechanism language does not establish that a CS-4 supplement raises muscle ATP, creates an immediate energy surge, or improves training performance in a particular user.

Fatigue and vitality

Broad vitality wording is not a defined outcome. The cited exercise trials do not establish a reliable effect on everyday fatigue or validate every energy-support formula containing CS-4.

Read the label

Start with the named material, then attach every number to what it actually describes

A large Cordyceps number is not useful until the label identifies the material behind it. Read the Supplement Facts line together with the serving size, preparation, extract or equivalent wording, marker disclosure, and blend structure.

A practical CS-4 label check

Look for explicit CS-4 or CordyMax Cs-4 wording rather than generic Cordyceps alone.
Keep the current Samsoniella hepiali identity separate from wild O. sinensis and C. militaris.
Confirm the actual amount in the complete listed serving.
Record cultured mycelium, fermentation, powder, or extract wording without treating them as interchangeable.
Separate the real material or extract mass from a raw-equivalent number.
Keep marker percentages as compositional details, not automatic efficacy scores.
Check whether CS-4 has its own amount or is hidden inside a blend.
Match any cited human study to CS-4, the tested amount, population, duration, and outcome.

For the category-level distinctions, use the Cordyceps supplement guide.

Marketing language that needs context

“Wild Cordyceps”: CS-4 is a cultured mycelial material. Wild imagery or historical C. sinensis wording does not make it harvested O. sinensis.
“Clinically studied Cordyceps”: The statement needs a named preparation and a study that matches the material, amount, population, duration, and claimed outcome.
“Boosts VO2 max”: The 12-week older-adult pilot did not change VO2 max, and the trained-cyclist trial did not improve VO2peak or performance.
“10,000 mg equivalent”: This is not the finished extract mass. Require the real amount, ratio basis, named material, and relevant compositional details.

Compare the stack

Different front-label purposes can hide the same CS-4 contribution

CS-4 can appear in a standalone Cordyceps capsule, mushroom complex, energy formula, pre-workout, or adaptogen blend. Another product may add generic Cordyceps or C. militaris, which should remain a separate disclosed identity rather than being silently combined with CS-4.

When products are added to My Stack, NutriDetector can compare supported CS-4 wording, disclosed amounts per listed serving, serving context, blend transparency, and surrounding ingredients across saved supplements. A hidden CS-4 share remains unknown rather than being assigned the full blend weight.

Illustrative My Stack comparison

This example shows label overlap. It is not a recommended combination.

Standalone CS-4 product: Cordyceps sinensis CS-4 mycelium culture, 1,000 mg per listed serving
Energy formula: CordyMax Cs-4, 500 mg, with caffeine and Rhodiola
Mushroom complex: CS-4 appears inside a 2,000 mg blend, but its individual amount is not disclosed
What remains separate: The disclosed 1,000 mg and 500 mg amounts can be compared. The hidden blend contribution cannot be added as a guessed dose.

What a label cannot tell you

A named CS-4 line improves specificity, but it is not laboratory or performance proof

A label can disclose CS-4 wording, amount, serving size, cultured mycelium or extract context, markers, and surrounding ingredients. It cannot establish:

whether the finished product contains the stated identity or amount;
actual fungal composition, purity, residual substrate, contaminants, or batch consistency;
equivalence to the exact products used in older human trials;
whether a person will experience more energy, endurance, or less fatigue;
an acute pre-workout onset or a personal response timeline; or
complete medicine compatibility or personal suitability.

Named material and transparent milligrams make the label easier to evaluate. They do not turn a small preparation-specific study into a guaranteed result for the finished supplement.

Safety and limits

Small short trials cannot define long-term safety for every CS-4 product

The two exercise trials cited here involved 20 and 22 participants and lasted 12 and five weeks. They show that the tested CS-4 preparations were administered over those periods, but they were not designed to establish a universal upper limit, detect rare adverse effects, or define long-term safety. ^{3,
4}

Pregnancy, breastfeeding, childhood use, regular medicines, immune-modifying treatment, upcoming procedures, and long-term use require more context than a Supplement Facts panel provides. Review the complete formula with a qualified clinician or pharmacist rather than assuming that short studies in healthy adults clear every use.

NutriDetector approach

How NutriDetector reads Cordyceps CS-4 labels

NutriDetector reviews supported explicit CS-4, Cordyceps sinensis CS-4, and CordyMax Cs-4 wording, the disclosed amount per listed serving, serving size, preparation context, blend transparency, and the surrounding formula. It keeps the labeled material mass separate from a raw-equivalent claim and does not treat the total weight of a blend as the individual CS-4 amount.

When products are added to My Stack, NutriDetector can compare those supported disclosed details across supplements and surface where CS-4 repeats. A generic Cordyceps line or a C. militaris label should not be used as proof of a named CS-4 amount.

NutriDetector evaluates the information disclosed on the label. Laboratory testing would still be required to confirm fungal identity, actual CS-4 content, marker levels, residual substrate, purity, contaminants, or batch consistency, while medicine compatibility and personal suitability depend on the individual and complete product.

Analyze the full formula

Check the named material before the Cordyceps claim.

Compare explicit CS-4 identity, amount per listed serving, preparation wording, blend transparency, and surrounding ingredients across your supplements.

Analyze a supplement label

Questions and boundaries

Cordyceps CS-4 supplement FAQ

What is Cordyceps CS-4?

CS-4 is a named cultured mycelial fungal material developed as an alternative to wild Chinese cordyceps. Human studies often call it Cordyceps sinensis or CordyMax Cs-4, while the fungus historically called Paecilomyces hepiali is now classified as Samsoniella hepiali.

Is CS-4 the same as wild Cordyceps sinensis?

No. The wild fungus-insect complex historically called Cordyceps sinensis is now classified as Ophiocordyceps sinensis. CS-4 is a cultured mycelial material associated with a different fungus and should not be presented as harvested wild O. sinensis.

Is CS-4 the same as Cordyceps militaris?

No. Cordyceps militaris is a separate species sold as fruiting body, mycelium, fermented biomass, powder, or extract. Its evidence should not be substituted for CS-4 research, and CS-4 studies should not validate a C. militaris product.

Is CS-4 a fruiting-body mushroom?

CS-4 is a named cultured mycelial preparation, not a fruiting-body product. This material type is not automatically inferior, because the relevant human studies tested cultured CS-4. The important question is whether the commercial label identifies the same named material and amount.

Does CS-4 improve VO2 max or endurance?

The evidence is limited and mixed. A 12-week pilot in 20 older adults reported changes in metabolic and ventilatory thresholds but no change in VO2 max. A five-week trial in 22 trained male cyclists found no improvement in VO2peak, ventilatory threshold, or time-trial performance.

Does CS-4 work immediately before exercise?

The cited controlled studies used daily supplementation for five or 12 weeks. They did not establish a reliable acute effect or an optimal pre-workout timing window. A noticeable immediate effect may also come from caffeine or other ingredients in a multi-ingredient formula.

How much CS-4 should a supplement contain?

There is no universal evidence-based amount for every claim or user. Human exercise trials tested about 1 g daily in older adults and 3 g daily in trained cyclists, with different outcomes. These are study protocols, not personal recommendations or targets for generic Cordyceps products.

Do polysaccharide or adenosine percentages prove a better CS-4 product?

No single marker percentage proves CS-4 identity, equivalence to a studied preparation, or a better clinical result. Marker disclosure can add compositional context, but it should be read alongside the named material, actual amount, preparation, analytical method, and claim.

What should I check on a CS-4 label?

Check for explicit CS-4 or CordyMax Cs-4 wording, the actual amount per full serving, cultured mycelium or extract context, the difference between real mass and raw-equivalent claims, marker disclosure, blend transparency, and whether cited research tested the same material.

What can NutriDetector compare on CS-4 labels?

NutriDetector can compare supported explicit CS-4 wording, disclosed amounts per listed serving, serving context, preparation wording, blend transparency, and surrounding ingredients. My Stack keeps a clearly stated CS-4 amount separate from an unknown contribution hidden inside a blend.

Scientific references and taxonomy sources

Wang YB, Wang Y, Fan Q, et al. Multigene phylogeny of the family Cordycipitaceae (Hypocreales): new taxa and the new systematic position of the Chinese cordycipitoid fungus Paecilomyces hepiali. Fungal Diversity. 2020;103:1-46. Primary taxonomy study.
National Center for Biotechnology Information. Ophiocordyceps sinensis, Taxonomy ID 72228. NCBI Taxonomy.
Chen S, Li Z, Krochmal R, et al. Effect of Cs-4 (Cordyceps sinensis) on exercise performance in healthy older subjects: a double-blind, placebo-controlled trial. Journal of Alternative and Complementary Medicine. 2010;16(5):585-590. PubMed.
Parcell AC, Smith JM, Schulthies SS, Myrer JW, Fellingham G. Cordyceps Sinensis (CordyMax Cs-4) supplementation does not improve endurance exercise performance. International Journal of Sport Nutrition and Exercise Metabolism. 2004;14(2):236-242. PubMed.