Mushroom Adaptogens Overview: Reishi, Cordyceps, Chaga and Lion's Mane
Reishi, cordyceps, chaga and lion's mane are often called adaptogens. This overview explains what that label does and does not mean and points to the full mushroom guides.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read who should be careful, by situation before you use anything on this page.
Mushroom supplements are often sold under the word "adaptogen". This page is a short map: what the word means for mushrooms, what the sources we read say about each of the four best-known ones, and where the full guides are. The profiles themselves live in the Mushrooms library, not here.
Before you start. Several of these mushrooms have documented cautions with medicines (blood thinners, immune-suppressing medicines, blood sugar medicines), and some have kidney or liver reports. Read how medicine interactions work and ask a pharmacist or clinician before using one. If stress, low mood or anxiety is affecting daily life, a clinician can help; in the US you can call or text 988 (Suicide & Crisis Lifeline) at any time.
Is "adaptogen" a fair word for a mushroom?
"Adaptogen" is a contested term, not a medical category. The European Medicines Agency's herbal committee wrote in 2008 that the term is not accepted in the pharmacological and clinical language commonly used in the EU. [1] That paper was about plant preparations, and the parts of it we read do not mention mushrooms. [1] So when a label calls a mushroom an adaptogen, it is using a marketing and traditional-medicine word, not a regulator's classification. The general explainer is What Are Adaptogens?.Researchers do use the word for mushrooms in some papers. One 2026 review of cordyceps proposes a shared "adaptogenic mechanism" for two Cordyceps species and argues for a new regulatory category. [2] That is one author's proposal in a narrative review, not an agreed definition. A separate 2026 review lists Cordyceps militaris among seven "proposed" next-generation adaptogens and says many of the mechanisms remain mostly preclinical. [3]
The four mushrooms at a glance
Traditional use and research findings are kept apart below. Neither is a promise that a product will work for you.| Mushroom | Scientific name (as the sources give it) | Traditional or folk use (not proof) | What the sources we read say about research | Full guide |
|---|---|---|---|---|
| Reishi | Ganoderma lucidum [4] | Holds an important place in traditional medical systems of China, Japan, Korea and other Asian countries. [4] | Mixed and limited. Memorial Sloan Kettering (MSK) reports some benefit for anxiety and urinary symptoms in men, but trials did not support use for diabetes-related heart risk factors. [4] | More about Reishi → |
| Cordyceps | Ophiocordyceps sinensis (wild caterpillar fungus) and Cordyceps militaris (commonly cultivated) | Used in traditional Chinese medicine for fatigue and other conditions, and described as an adaptogen or immune stimulant. [5] | Mixed for exercise performance in healthy people. [5][6] | More about Cordyceps → |
| Chaga | Inonotus obliquus | A folk remedy in Russia and other northern European countries. [7] | Preclinical findings in the MSK summary, which says safety and efficacy have yet to be evaluated in clinical studies. [7] | More about Chaga → |
| Lion's mane | Hericium erinaceus | A long history of use in Native American and East Asian medical systems for infections, anxiety, stress and depression, per MSK. [8] | Limited clinical data on memory and mood; a 2025 systematic review found five randomized trials. [8][9] | More about Lion's mane → |
Names were checked against GBIF, which lists Ganoderma lucidum, Ophiocordyceps sinensis, Cordyceps militaris, Inonotus obliquus and Hericium erinaceus as accepted names. [10]
What the evidence does and does not show
- Stress, sleep and "adrenal" claims. Marketing often links mushrooms to cortisol or "adrenal support". Cortisol is a lab marker, not the same as how someone feels, and "adrenal fatigue" is not a recognised diagnosis; see Adrenal Fatigue and Adrenal Support Claims.
- Reishi and sleep. We searched PubMed for human trials of Ganoderma and sleep and found laboratory and mouse studies, not human trials. See the reishi claim check.
- Cordyceps and energy. Small trials exist, with inconsistent results. See the cordyceps claim check.
- Blends. One 2026 randomized trial tested a mushroom blend for stress, fatigue and sleep over 12 weeks in 50 people and reported improvements. [11] It tested one blend, so its results cannot be assigned to any single mushroom or any other product. The abstract we read did not state who paid for it.
Related reading
Mushroom coffee and blends, claims checked, reishi and cordyceps in Chinese medicine, research by ingredient.Frequently asked questions
Are mushrooms really adaptogens?
It depends on who is defining the word. The EU herbal committee said in 2008 that the term is not accepted in pharmacological and clinical terminology used in the EU. [1] Some researchers argue cordyceps fits the idea, but that is a proposal in a review. [2]
Which mushroom has the most research?
This page did not rank them. Each has a different mix of laboratory, small human and case-report evidence; see the individual guides and what each source says about strength. [4][5][7][8]
Do mushroom supplements lower cortisol or treat adrenal fatigue?
We did not find a source we read showing that. "Adrenal fatigue" is covered on its own page, and a cortisol change in a lab is not the same as feeling less stressed. See the adrenal claims page linked above.
Can I take a mushroom supplement with a blood thinner or other medicines?
Ask a pharmacist or prescriber first. MSK flags blood thinners for reishi, cordyceps and chaga, immunosuppressants for reishi, and blood-sugar medicines for cordyceps. [4][5][7]
Are mushroom supplements regulated like medicines?
The sources we read about these four mushrooms do not describe their regulation. The general rules for supplements are explained on how supplements are regulated.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety points that come up across the four
- Bleeding and blood thinners. MSK says reishi, cordyceps and chaga may each raise bleeding risk or add to the effect of blood thinners such as warfarin. [4][5][7]
- Immune-suppressing medicines. MSK tells people on immunosuppressants to talk to their provider before reishi. [4]
- Blood sugar medicines. MSK says cordyceps can also lower blood sugar and to talk with a provider if taking insulin or another blood-sugar-lowering medicine. [5]
- Liver and kidney. MSK lists liver injury as a possible reishi side effect, and describes chaga powder cases of oxalate kidney damage. [4][7]
- Pregnancy, breastfeeding and children. The MSK pages we read do not address these. That is not proof of safety; see pregnancy and breastfeeding guidance.
- Before surgery. Tell the surgical team about any mushroom product; see supplements before surgery.
- Product quality. What is in the container can differ from the label. See how to read an adaptogen label and mushroom ingredient terms.
References
- European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Reflection paper on the adaptogenic concept. EMEA/HMPC/102655/2007, adopted 8 May 2008. Read 2026-10-23.
- Panossian A. Pleiotropic bioactivity of caterpillar fungus, orange cordyceps, and cordycepin: insight from integrated network pharmacology and food and drug regulatory framework. Pharmaceuticals (Basel). 2026 (narrative review). PubMed 41901364. Read 2026-10-23.
- Such A, Czernicka M. Next-generation adaptogens: molecular mechanisms, bioactive compounds and human health relevance of selected botanicals and fungi. Int J Mol Sci. 2026. PubMed 42883811. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Reishi Mushroom. Integrative Medicine herbs database, page updated May 5, 2026. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Cordyceps. Integrative Medicine herbs database, page updated February 10, 2022. Read 2026-10-23.
- Jędrejko K, Jędrejko K, Granda D, et al. Current evidence of ergogenic and post-exercise recovery effects of dietary supplementation with Cordyceps militaris in humans: a narrative review. Nutrients. 2026. PubMed 41829950. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Chaga Mushroom. Integrative Medicine herbs database. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Lion’s Mane Mushroom. Integrative Medicine herbs database. Read 2026-10-23.
- Menon A, Jalal A, Arshad Z, Nawaz FA, Kashyap R. Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review. Front Nutr. 2025. PubMed 40959699. Read 2026-10-23.
- GBIF Secretariat. GBIF Backbone Taxonomy species match, queried through api.gbif.org on 2026-10-23. Read 2026-10-23.
- Hisamuddin NH, Ramli NS, Leo CP, et al. Adaptogenic effects of mushroom blend supplementation on stress, fatigue, and sleep: a randomised, double-blind, and placebo-controlled trial. Brain Behav. 2026. PubMed 41540766. Read 2026-10-23 (abstract only; funding not stated there).