Fruiting Body vs. Mycelium
What fruiting body and mycelium are, how they differ in lab studies, which human trials used which, and what to look for on a label, with no claim that one is better.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
The short answer: a fruiting body and mycelium are different materials, and a result for one should not be assumed for the other. The sources we read describe differences in composition but did not compare the two head to head for a health outcome in people.
What the terms mean
The fruiting body is the part most people eat: the stalk and cap. The mycelium is the network that supports it. [1] Researchers report active compounds in lion's mane (Hericium erinaceus) in both mycelia and fruiting bodies. [2] A third material, mycelium grown on grain, is covered in Mycelium Grown on Grain.
Culinary mushrooms are sold as fruiting bodies. One lion's mane trial report notes that typically only the fruiting bodies are eaten as food. [3] Supplements may use fruiting body, mycelium or both.
What studies found
| Question | What the source found | Strength of evidence |
|---|---|---|
| Do the two parts contain the same substances? | A study of four edible species found 54 polar metabolites. For three species the fruiting bodies had more essential amino acids than the mycelia. [1] | Laboratory chemistry only |
| Is lion's mane mycelium similar to its fruiting body? | In the same study the profiles were most similar for two species, including H. erinaceus, which led the authors to suggest the mycelia may be good replacements. [1] | Laboratory chemistry; not a health outcome |
| Does the growing method matter? | In Cordyceps militaris, substrate and cultivation method influenced the properties. Cordycepin was highest in two supplements, and after simulated digestion highest in fruiting bodies. [4] | Laboratory chemistry and a digestion model |
| Lion's mane fruiting body in people | A 12-week randomized placebo-controlled trial of supplements containing fruiting body reported a better score on one of three cognitive tests (MMSE). [5] A single-dose crossover study of a fruiting body extract found no significant overall effect on cognition or mood. [3] | Promising but limited |
| Lion's mane mycelium in people | A 49-week pilot trial of erinacine A-enriched mycelium capsules in people with mild Alzheimer's disease reported higher cognitive scores than placebo. [6] | Promising but limited; pilot; several authors are affiliated with a biotech company |
| Head-to-head: fruiting body vs mycelium in people | Proper evidence not found. We searched PubMed for fruiting body versus mycelium comparisons and found laboratory and growing studies, not a trial comparing them. | Insufficient evidence |
A cancer center says limited clinical data suggest lion's mane may improve memory and mood in overweight individuals. [2]
Why the label matters
- Species and part. A product may name the species but not the part. For reishi (Ganoderma lucidum) a cancer center warns specifically about spore powder, which raised a tumor-marker test in one report. [7] See Reishi Species, Spores and Fruiting Body Products.
- What else is in the powder. Processing can remove visible features, which makes species identification difficult for samples containing mycelia; DNA barcoding has been tested as a check. [8]
- Accuracy. Popular functional mushroom products can be adulterated, with inaccurate labeling. [9]
Frequently asked questions
Is mycelium better than fruiting body, or the other way around?
Proper evidence not found for a head-to-head human comparison. Studies describe differences in composition for some species and similarities for others. [1]
Why do some products say "mycelium" and others "fruiting body"?
They are different materials, and the choice affects what a trial can say about the product. [2]
Does a product made from mycelium contain the same compounds as the mushroom?
Not necessarily. In one comparison the fruiting bodies of three of four species had higher essential amino acids than their mycelia. [1] Growing method also changed C. militaris properties. [4]
Can a lab tell what a powder is made from?
Sometimes. DNA barcoding was able to sequence powdered mycelium, grocery mushrooms and supplement capsules in most cases tested. [8]
Do I need to tell my doctor about a mushroom supplement?
Yes. Tell your health care providers about all supplements. [10]
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
Mushroom products can interact with medicines or carry risks if you have certain medical conditions or are going to have surgery. [10] Reishi has reports of liver injury and a bleeding caution; ask about warfarin or immunosuppressants. [7] Lion's mane has reported abdominal discomfort, nausea and skin rash. [2] Pregnancy, breastfeeding and children: many supplements have not been tested in these groups. [10] Check How Interactions Work and ask a pharmacist.
References
- Chien RC, Chen SY, Mishchuk DO, Slupsky CM. Hydrophilic metabolite composition of fruiting bodies and mycelia of edible mushroom species. Int J Med Mushrooms. 2023. PubMed 37831510. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Lion's Mane Mushroom: Purported Benefits, Side Effects & More. Read 2026-10-23.
- Surendran G, Saye J, Binti Mohd Jalil S, et al. Acute effects of a standardised extract of Hericium erinaceus (lion's mane mushroom) on cognition and mood in healthy younger adults. Front Nutr. 2025. PubMed 40276537. Read 2026-10-23.
- Jedrejko K, Kala K, Sulkowska-Ziaja K, et al. Cordyceps militaris: fruiting bodies, mycelium, and supplements: valuable component of daily diet. Antioxidants. 2022. PubMed 36290584. Read 2026-10-23.
- Saitsu Y, Nishide A, Kikushima K, Shimizu K, Ohnuki K. Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomed Res. 2019. PubMed 31413233. Read 2026-10-23.
- Li IC, Chang HH, Lin CH, et al. Prevention of early Alzheimer's disease by erinacine A-enriched Hericium erinaceus mycelia: pilot double-blind placebo-controlled study. Front Aging Neurosci. 2020. Several authors are affiliated with a biotech company. PubMed 32581767. Read 2026-10-23.
- Memorial Sloan Kettering Cancer Center. Reishi Mushroom: Purported Benefits, Side Effects & More. Read 2026-10-23.
- Raja HA, Baker TR, Little JG, Oberlies NH. DNA barcoding for identification of consumer-relevant mushrooms: a partial solution for product certification? Food Chem. 2017. PubMed 27507489. Read 2026-10-23.
- You H, Abraham EJ, Mulligan J, et al. Label compliance for ingredient verification: regulations, approaches, and trends for testing botanical products marketed for "immune health" in the United States. Crit Rev Food Sci Nutr. 2024. PubMed 36123797. Read 2026-10-23.
- National Center for Complementary and Integrative Health (NIH). Using Dietary Supplements Wisely. Read 2026-10-23.