Mushroom supplement labels are written in a language of their own: fruiting body, 10:1 extract, dual extracted, 30% beta-glucans, full spectrum. Some of these terms tell you a lot about what's in the jar. Others tell you almost nothing. In a 2017 study of 19 reishi supplements bought in the US, only 5 matched their labels when tested. Knowing the vocabulary is the first step to spotting which kind of label you're reading.
The most useful label terms are the part of the mushroom used (fruiting body or mycelium), the extraction method (hot water, alcohol or dual), the extract ratio, and a beta-glucan figure measured by a named method. Terms like "full spectrum", "superfood" and "proprietary blend" carry little information on their own. This glossary defines 48 terms in plain English and says what each one does and doesn't tell you.
Terms are grouped by topic: mushroom parts, extraction, compounds, testing, Amanita-specific vocabulary and effect claims. For a worked walkthrough of a real label, see our guide to reading a mushroom supplement label.
What Do the Mushroom Part Terms Mean?
The part of the fungus used changes what's in the product more than almost anything else. McCleary and Draga's 2016 method paper on measuring beta-glucan was designed partly to expose one problem: mycelium grown on grain can be mostly starch from the grain rather than fungal material. Here's the vocabulary.
- Fruiting body. The mushroom itself, the part you'd see above ground or on a tree. Most traditional use and most human trials use fruiting bodies.
- Mycelium. The thread-like root network of the fungus. It contains different compounds from the fruiting body, and in lion's mane it's the main source of erinacines.
- Myceliated grain (mycelium on grain). Mycelium grown on rice or oats and dried together with the grain. The grain can't be separated, so the product may be largely starch.
- Mycelial biomass. Mycelium grown in liquid and filtered out. It contains less grain starch than myceliated grain, but still differs from the fruiting body.
- Sclerotium or conk. A hardened fungal mass. Chaga is a sterile conk that grows on birch, not a true fruiting body.
- Spores and spore powder. The fungus's reproductive cells. Reishi spore powder is sold separately, often "sporoderm-broken", meaning the tough spore walls have been cracked.
- Whole mushroom. Usually means dried, ground fruiting bodies with no extraction. Cheaper per gram, but less concentrated.
Our fruiting body vs mycelium guide covers the trade-offs in more depth.
What Do Extraction Terms Mean?
Extraction pulls compounds out of tough fungal cell walls made of chitin. Different solvents pull out different compounds, which is why the method matters. These are the terms you'll see.
- Hot water extraction. Simmering the mushroom in water. It's the traditional method and the main way to release beta-glucans and other polysaccharides.
- Alcohol extraction. Soaking in ethanol. It pulls out smaller, less water-soluble compounds such as triterpenes in reishi.
- Dual extraction (double extraction). Both of the above, combined. It captures more of the mushroom's range than either alone. See our dual extraction guide.
- Extract ratio (for example 10:1). How many grams of raw mushroom went into each gram of finished extract. A 10:1 extract used 10 g of mushroom per 1 g of powder. It doesn't tell you which compounds were kept.
- Standardised extract. An extract tested to contain a stated amount of a marker compound, such as "30% beta-glucans". Only meaningful if the test method is named.
- Full spectrum. A marketing term with no fixed definition. Sometimes it means dual extracted, sometimes it means unextracted whole mushroom.
- Tincture. A liquid extract, usually preserved in alcohol. Our lion's mane tincture guide explains how to use one.
- Concentrate. Usually a synonym for extract. Ask what was concentrated and by how much.
Our extract ratios guide shows how to turn a ratio into a mushroom-equivalent dose.
Which Compounds Show Up on Labels?
Mushrooms contain hundreds of compounds, but labels tend to name a handful. Kalaras and colleagues found ergothioneine levels ranging from 0.15 to 7.27 mg per gram of dry weight across mushroom species in 2017. That kind of spread is typical: the same compound can vary twentyfold or more between species and batches.
- Polysaccharides. Long sugar chains. A broad term that includes beta-glucans but also starch, so "40% polysaccharides" can be inflated by grain.
- Beta-glucans (β-glucans). The main structural polysaccharides in mushroom cell walls, studied for effects on the immune system. The most useful single number on a label, if measured properly. See beta-glucan vs polysaccharide.
- Alpha-glucans (α-glucans). Mainly starch and glycogen. High levels suggest grain filler or mycelium grown on grain.
- Chitin. The tough fibre in fungal cell walls, the same material as in insect shells. Humans digest it poorly, which is why extraction matters.
- Triterpenes. Bitter, fat-soluble compounds. Reishi's ganoderic acids are the best-known example. See what are triterpenes.
- Ergothioneine. A sulphur-containing antioxidant that mushrooms are the richest dietary source of. See our ergothioneine guide.
- Hericenones and erinacines. Compound families from lion's mane, studied in the lab for effects on nerve growth factor. Hericenones come mainly from the fruiting body, erinacines from the mycelium.
- Cordycepin. A nucleoside found in Cordyceps militaris, often used as a quality marker for cordyceps products.
- Ganoderic acids. The triterpenes characteristic of reishi, and the reason it tastes bitter.
- Lentinan. A purified beta-glucan from shiitake, used as an injectable drug in Japan. It isn't the same as eating shiitake.
- PSK and PSP. Protein-bound polysaccharides from turkey tail. PSK is a prescription product in Japan, studied alongside cancer treatment.
- Betulinic acid. A triterpene chaga is said to take up from birch bark. Levels vary with the host tree.
- Oxalate. A natural compound that can contribute to kidney stones. Chaga is very high in it. See our oxalates article.
What Do Testing and Quality Terms Mean?
These terms tell you whether anyone checked the claims. They matter because label accuracy is far from guaranteed. Wu and colleagues tested 19 reishi supplements sold in the US in 2017. The measured triterpenes and polysaccharides matched the labels in only 5 of them, or 26%.
- Certificate of analysis (CoA). A lab report for a specific batch, listing what was tested, the method and the result. See our guide to reading a CoA.
- Batch or lot number. The code that links the product in your hand to its production records and test results.
- Megazyme method. The common name for the beta-glucan assay published by McCleary and Draga. It measures total glucan, subtracts alpha-glucan, and reports beta-glucan by difference.
- Heavy metals. Lead, cadmium, mercury and arsenic. Mushrooms can absorb them from their growing medium. See our heavy metals guide.
- Microbial testing. Checks for bacteria, yeasts and moulds. Relevant for powders, as our mould and mycotoxins article explains.
- Third-party tested. Tested by a lab independent of the seller. Worth more if the results are published and tied to a batch.
- Proprietary blend. A mix whose individual amounts are hidden. It makes it impossible to know how much of each ingredient you're taking.
- Organic. Grown under a certified organic standard. It says nothing about potency, but it limits some pesticide and additive use.
What Do Amanita Terms Mean?
Amanita muscaria has its own vocabulary, and some of it is used loosely. A 2026 review by Günther and colleagues warns that claims of "complete" conversion of ibotenic acid to muscimol aren't supported without batch-specific lab data. Here's what the common terms mean.
- Muscimol. The main psychoactive compound in Amanita muscaria and panther cap. It acts directly on GABA-A receptors, which calm brain activity.
- Ibotenic acid. The precursor of muscimol. It acts on glutamate receptors and is linked to nausea and agitation. See ibotenic acid vs muscimol.
- Decarboxylation. The chemical reaction, driven by heat and helped by acidity, that turns ibotenic acid into muscimol. Our decarboxylation guide explains what's been measured.
- Muscarine. A compound named after Amanita muscaria but present only in small amounts. It isn't responsible for the main effects.
- Microdosing. Taking small, regular amounts below the level that causes obvious effects. See our microdosing explainer.
- Grade A, grade B, premium. Seller grades based on cap size, appearance and cleanliness. They aren't industry standards. See our grades explained article.
What Do Effect Claims Actually Mean?
These words describe what a product is supposed to do, and they're the least regulated part of the label. Panossian and Wikman, who have reviewed adaptogen research extensively, describe them as substances that increase the body's resistance to stress. That's a specific pharmacological idea, yet the word now appears on almost any mushroom product.
- Adaptogen. A substance claimed to help the body resist physical or mental stress. Reishi and cordyceps are often called adaptogens. See adaptogen vs nootropic.
- Nootropic. Anything claimed to support thinking, memory or focus. Lion's mane is the mushroom most often marketed this way.
- NGF (nerve growth factor). A protein that supports nerve cells. Lion's mane compounds raise NGF in lab studies; human evidence is limited.
- Immunomodulator. Something that adjusts immune activity, up or down. Often used for beta-glucans.
- Bioavailability. How much of a compound reaches your bloodstream. Rarely measured for mushroom supplements, despite frequent claims.
- Superfood. A marketing word with no scientific definition.
Which Terms Should You Trust Most?
Trust specific, testable terms over adjectives. A label that says "reishi fruiting body, hot-water extract, 10:1, beta-glucans 25% by Megazyme method, batch 2410" can be checked. A label that says "premium full-spectrum superfood mushroom complex" can't.
A quick rule: every number on a label should come with a method, a unit and a batch. If any one is missing, the number is a claim rather than a measurement. And if a label leaves out the part of the mushroom used, ask the seller before you buy.
Frequently Asked Questions
What does 10:1 extract mean on a mushroom supplement?
It means 10 g of raw mushroom went into each 1 g of extract. It tells you how concentrated the process was, not which compounds survived. A 10:1 extract with no beta-glucan figure could still be low in the compounds you want. Look for a measured marker alongside the ratio.
What's the difference between polysaccharides and beta-glucans?
Beta-glucans are one type of polysaccharide. "Polysaccharides" also includes starch, so a product grown on grain can show a high polysaccharide figure that's mostly starch. The Megazyme method measures total glucan and subtracts alpha-glucan to give a true beta-glucan figure.
Is mycelium as good as fruiting body?
They're different, not simply better or worse. Fruiting bodies are used in most human trials. Mycelium contains other compounds, such as erinacines in lion's mane. The problem is mycelium grown on grain, which can be mostly starch. Check whether the label names the grain or the growing method.
What does dual extracted mean?
It means the mushroom was extracted with hot water and with alcohol, and the two extracts were combined. Hot water releases beta-glucans; alcohol releases triterpenes and other less water-soluble compounds. It's the most complete method for mushrooms like reishi and chaga.
How accurate are mushroom supplement labels?
Often not very. In a 2017 study of 19 reishi supplements sold in the US, only 5 (26%) contained what their labels claimed. Batch-specific lab results, a named test method and a lot number are the best signs a label can be trusted.
Related Articles
- How to Read a Mushroom Supplement Label
- Beta-Glucan vs Polysaccharide on Labels
- Extract Ratios Explained
- Dual Extraction Explained
- How to Read a Certificate of Analysis
- Mushroom Blend vs Single Species
Sources
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- Kalaras MD, Richie JP, Calcagnotto A, Beelman RB. Mushrooms: a rich source of the antioxidants ergothioneine and glutathione. Food Chem. 2017;233:429-433. PubMed 28530594
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