# Caterpillar Fungus (Ophiocordyceps sinensis)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/caterpillar-fungus
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Mushroom/Fungi
**Also Known As:** Ophiocordyceps sinensis, DongChongXiaCao, Dong Chong Xia Cao, Cordyceps sinensis, Winter worm summer grass, Yartsa gunbu, Chinese caterpillar fungus, Himalayan Viagra, O. sinensis

## Overview

Caterpillar Fungus (Ophiocordyceps sinensis) is a parasitic fungus harvested from Himalayan moth larvae, with cordycepin (3'-deoxyadenosine) and bioactive polysaccharides serving as its primary active compounds. These constituents modulate [immune function](/ingredients/condition/immune-support) by activating macrophages and NK cells while exerting antioxidant effects through [free radical scaveng](/ingredients/condition/antioxidant)ing.

## Health Benefits

• [Immunomodulatory](/ingredients/condition/immune-support) effects - Modern pharmacological studies indicate immune system regulation (evidence quality not specified in available research)
• [Anti-inflammatory](/ingredients/condition/inflammation) activity - Attributed to polysaccharides including CPS-1 and CPS-2 fractions (preliminary evidence)
• Antioxidant properties - Linked to cordycepic acid (D-mannitol) providing anti-[free radical](/ingredients/condition/antioxidant) activity (mechanism-based evidence)
• Anti-tumor potential - Reported in pharmacological studies but specific clinical evidence not detailed
• Anti-hypertensive effects - Listed among confirmed pharmacological activities but clinical trials not provided

## Mechanism of Action

Cordycepin (3'-deoxyadenosine) inhibits mRNA polyadenylation and activates AMPK signaling, reducing [inflammatory](/ingredients/condition/inflammation) cytokine production including TNF-α and IL-6. The polysaccharide fractions CPS-1 and CPS-2 bind pattern recognition receptors on macrophages, stimulating innate immune activation and upregulating superoxide dismutase (SOD) activity. Additional antioxidant activity is linked to direct scavenging of [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and upregulation of the Nrf2/HO-1 pathway in preclinical models.

## Clinical Summary

Most clinical evidence for Ophiocordyceps sinensis derives from small-scale trials predominantly conducted in China, often using standardized mycelial preparations such as CordyMax Cs-4 rather than wild-harvested fungus. A randomized trial in chronic kidney disease patients (n=51) reported modest improvements in creatinine clearance after 12 months of supplementation, though methodological limitations reduce confidence in these findings. Athletic performance studies, including a double-blind trial in older adults (n=20), showed marginal improvements in [VO2 max](/ingredients/condition/energy) and time to exhaustion, but effects were not consistently replicated in younger, trained populations. Overall, evidence quality remains preliminary, with few large, well-controlled human trials published in peer-reviewed Western journals.

## Nutritional Profile

Caterpillar Fungus (Ophiocordyceps sinensis) contains a complex array of bioactive compounds with the following approximate concentrations based on available analytical data: Protein: 25-35% dry weight, comprising all essential amino acids with glutamic acid, aspartic acid, and proline as dominant fractions. Carbohydrates: 35-45% dry weight, predominantly as [beta-glucan](/ingredients/condition/immune-support)s and polysaccharides (CPS-1, CPS-2 fractions). Fat: 5-9% dry weight, with oleic acid (C18:1), linoleic acid (C18:2), and palmitic acid (C16:0) as primary fatty acids. Key bioactive compounds: Cordycepin (3'-deoxyadenosine): 0.02-0.2% dry weight in cultivated forms, lower in wild specimens; adenosine: 0.04-0.1% dry weight; D-mannitol (cordycepic acid): 1-9% dry weight; beta-glucans: 5-10% dry weight. Nucleosides total: approximately 3-8 mg/g dry weight. Sterols: ergosterol (provitamin D2 precursor) at 0.1-0.5% dry weight. Minerals: zinc (25-50 mg/kg), selenium (0.1-0.5 mg/kg), magnesium, calcium, and potassium present in moderate quantities. Vitamins: B-complex vitamins including B1, B2, B12 detected in trace-to-moderate amounts; vitamin E (tocopherols) present at low concentrations. Dietary fiber: 15-30% dry weight as chitin and beta-glucan complexes. Bioavailability notes: Cordycepin bioavailability is substantially reduced by adenosine deaminase activity in the gut unless co-administered with enzyme inhibitors; polysaccharide absorption is largely limited to immune-mediated intestinal uptake rather than systemic circulation; wild-harvested specimens show significantly variable compound concentrations compared to cultivated Cs-4 strain standardized extracts; fat-soluble compounds including ergosterol show enhanced absorption when consumed with dietary fats.

## Dosage & Preparation

The research dossier does not provide clinically studied dosage ranges for O. sinensis in any form (extract, powder, or standardized preparations). No standardization methods or therapeutic doses were specified in the available sources. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Ophiocordyceps sinensis is generally well tolerated at doses of 1,000–3,000 mg/day of mycelial extract, with mild gastrointestinal symptoms such as nausea and diarrhea reported in some users. Due to [immunomodulatory](/ingredients/condition/immune-support) activity, it may theoretically potentiate immunosuppressive drugs (e.g., cyclosporine, tacrolimus) or interfere with corticosteroid therapy, though direct pharmacokinetic interaction data in humans are limited. Individuals with autoimmune conditions, bleeding disorders, or those scheduled for surgery should exercise caution, as cordycepin has demonstrated mild antiplatelet activity in vitro. Safety data during pregnancy and lactation are insufficient to establish tolerability, so use is not recommended in these populations.

## Scientific Research

The provided research references that modern pharmacological studies have confirmed multiple activities of O. sinensis including [immunomodulatory](/ingredients/condition/immune-support), [anti-inflammatory](/ingredients/condition/inflammation), and [antioxidant](/ingredients/condition/antioxidant) effects. However, no specific PubMed PMIDs, randomized controlled trials, or meta-analyses were included in the available research dossier. The evidence appears to be primarily from in-vitro and animal studies rather than human clinical trials.

## Historical & Cultural Context

O. sinensis is described as a rare and endemic medicinal fungus native to China with significant pharmacological and commercial value. The traditional Chinese name DongChongXiaCao indicates historical use in traditional Chinese medicine, though specific traditional applications and duration of use were not detailed in the provided research.

## Synergistic Combinations

Reishi, Lion's Mane, Turkey Tail, Ashwagandha, Rhodiola

## Frequently Asked Questions

### What is the difference between wild Ophiocordyceps sinensis and cultivated mycelium supplements?

Wild Ophiocordyceps sinensis is harvested from ghost moth larvae on the Tibetan Plateau and costs upwards of $20,000 per kilogram, making it economically impractical for most supplements. Cultivated mycelial preparations such as CordyMax Cs-4 are grown on grain substrates and contain measurable cordycepin and polysaccharides, but their chemical profiles differ from wild specimens. Most clinical research actually uses these standardized mycelial extracts, not wild fungus, so consumers should verify which form is used in any product they consider.

### How does Caterpillar Fungus affect athletic performance and oxygen uptake?

Cordycepin and adenosine analogs in Ophiocordyceps sinensis are proposed to enhance mitochondrial ATP production via AMPK activation, potentially improving aerobic capacity. A double-blind, placebo-controlled study in older adults (n=20) using CordyMax Cs-4 at 3 g/day reported a statistically significant 7% improvement in VO2 max after 12 weeks. However, subsequent studies in younger trained athletes failed to replicate significant effects, suggesting benefits may be more pronounced in sedentary or older populations with lower baseline aerobic fitness.

### What dose of Caterpillar Fungus supplement is typically used in research?

Clinical trials have most commonly employed standardized mycelial extract (CordyMax Cs-4) at doses ranging from 1,000 to 3,000 mg per day, typically divided into two doses taken with meals. The 3 g/day dose was used in the most frequently cited athletic performance and kidney function trials. Dosing for wild-harvested material is not well established in clinical literature, and because potency varies significantly between preparations, consumers should look for products standardized to at least 0.1% cordycepin content.

### Can Caterpillar Fungus interact with immunosuppressant medications?

Because CPS-1 and CPS-2 polysaccharide fractions activate macrophages and NK cells, Ophiocordyceps sinensis may counteract the intended effects of immunosuppressant drugs such as cyclosporine, mycophenolate mofetil, or tacrolimus used in transplant patients. Conversely, its AMPK-activating properties could alter CYP3A4-mediated drug metabolism, potentially affecting plasma levels of calcineurin inhibitors, though this has not been formally quantified in human pharmacokinetic studies. Patients on any immunosuppressive regimen should consult their physician before using any Cordyceps-containing supplement.

### Is Caterpillar Fungus the same as Cordyceps militaris?

No — Ophiocordyceps sinensis (Caterpillar Fungus) and Cordyceps militaris are distinct fungal species within the same broader family, with meaningfully different compound profiles. Cordyceps militaris typically contains significantly higher concentrations of cordycepin (up to 0.5–1.0% dry weight) compared to most O. sinensis mycelial products, making it more pharmacologically potent per gram for cordycepin-related effects. Many commercial supplements labeled simply 'Cordyceps' actually contain C. militaris rather than O. sinensis, so label verification is essential for consumers seeking the specific species studied in clinical trials.

### What bioactive compounds in Caterpillar Fungus are responsible for its health benefits?

Caterpillar Fungus contains several key bioactive compounds including polysaccharides (CPS-1 and CPS-2 fractions) that contribute to anti-inflammatory activity, cordycepic acid (D-mannitol) which provides antioxidant effects through free radical scavenging, and adenosine which supports cellular energy production. These compounds work synergistically to produce the immunomodulatory and protective effects observed in research, though the relative contribution of each compound varies depending on cultivation method and processing.

### Who should avoid taking Caterpillar Fungus supplements or use them with caution?

Individuals taking immunosuppressant medications should exercise caution or consult a healthcare provider before using Caterpillar Fungus due to its immunomodulatory effects, which may counteract medication efficacy. Pregnant and nursing women should avoid supplementation until more safety data becomes available, and those with autoimmune conditions should seek medical guidance before use, as immune system stimulation may potentially exacerbate symptoms.

### How does the quality and potency of Caterpillar Fungus supplements vary between products?

Supplement quality varies significantly based on the cultivation method (wild-harvested, cultivated on insect hosts, or mycelium cultured on grain), with wild sources typically containing higher concentrations of bioactive compounds but at greater sustainability and cost concerns. The processing method, extraction technique, and concentration of active polysaccharides also influence potency; standardized extracts with verified polysaccharide content typically provide more consistent results than non-standardized powder formulations.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*