Written by the Everyday Dose Editorial Team

So, you've decided to enter the marvelous world of mushroom supplements. Maybe you're here because you've heard of the brain-supporting benefits of lion's mane, or maybe you're looking for the gut-loving goodness of chaga.

Whatever brought you here, there are a few key decisions to make before choosing a supplement — and one of the most important is this: should you use an extract made with mushroom mycelium or one made with fruiting bodies? The answer matters more than most brands want to admit. Here's everything you need to know.

What Is Mycelium?

First things first, it helps to define exactly what mycelium is. It's more than just a funny word you may or may not have learned in middle school science class. It's one of the two main structural parts of a fungus.

Think of mycelium as a mushroom's root system. Mushrooms are fungi, which means they don't have the same roots as plants. However, mycelium serves essentially the same purpose: it brings nutrients to the mushroom and it usually stays hidden beneath the surface.

Unlike roots, mycelium has a very fine, wispy, almost feathery texture and it's far denser than plant roots. If you've ever seen mold grow on a piece of food, you've seen mycelium up close. Those thin filaments are what give mold its fuzzy appearance.

The mycelium helps break down whatever it's consuming, decomposing it and extracting nutrients in the process. It can even ferment foods, making certain compounds easier for other organisms to absorb.

Technically, mycelium is the primary body of the fungus. Mycelium can exist without a fruiting body, but fruiting bodies cannot exist without mycelium.

What Is a Fruiting Body?

The other main part of a mushroom is the fruiting body. If mycelium is the root system, the fruiting body is the flower.

The fruiting body exists for one primary purpose: reproduction. When the mushroom matures, it produces a fruiting body containing spores, which are released and carried by wind until they land and create new mushrooms.

Fruiting bodies also serve a critical identification function. Many mushrooms are impossible to identify by mycelium alone, but are immediately recognizable once the fruiting body appears. If you've ever seen a mushroom growing out of the ground or a log, you've seen a fruiting body.

A Note on Chaga: Not All Fungi Play by the Same Rules

Before going further, it's worth addressing chaga specifically, because it's a unique case that most supplement brands gloss over entirely.

Chaga is not technically a mushroom. It does not produce a fruiting body the way lion's mane, reishi, or other functional fungi do. Instead, what we harvest and use is called the sclerotia, or conk. This is a dense, hardened mass of fungal tissue that forms on the outside of birch trees. It is the functional, bioactive portion of the organism and it's what has been used in traditional medicine for centuries.

So when brands claim their chaga is "100% fruiting body," that's actually a red flag, not a quality signal. True, high-quality chaga comes from the wild-harvested sclerotia, not a lab-grown fruiting body substitute.

At Everyday Dose, we use wild chaga sclerotia (conk) rather than cultivated alternatives, because that's where the beneficial compounds actually live.

Which Is Better for Extracts?

Now for the real question: which part of the mushroom is better for supplements?

This is a topic with a lot of noise in the industry, so let's look at what the science actually shows and where the meaningful differences lie.

The Case for Fruiting Bodies

For mushrooms that do produce fruiting bodies, those structures are significantly more concentrated in the bioactive compounds linked to health benefits. Specifically:

Beta-glucans: These prebiotic fibers support immune function and gut health. Fruiting body extracts typically contain 30% or more beta-glucans, while mycelium grown on grain has been found to contain as little as 1 to 5%, largely because the grain substrate is included in the final product.

Triterpenes: Compounds like ganoderic acids (found in reishi) are concentrated almost exclusively in the fruiting body and have been studied for cardiovascular and metabolic support.

Polysaccharides: The hot-water-soluble polysaccharides responsible for most of mushrooms' traditional medicinal use are far more concentrated in fruiting bodies.

Historical precedent: Centuries of traditional use in Chinese, Japanese, and Korean medicine were based entirely on the fruiting body. The research base reflects this.

Fruiting bodies are also made of highly condensed mycelium, giving them a denser nutritional profile from the same organism.

The Nuance: Some Compounds Are Found Only in Mycelium

To be fair, mycelium isn't without value, and any brand that dismisses it entirely is oversimplifying. For example, lion's mane mycelium contains erinacines, compounds that are not found in the fruiting body. Erinacines can cross the blood-brain barrier, and early research suggests they may stimulate Nerve Growth Factor (NGF) and Brain Derived Neurotrophic Factor (BDNF).

So why do we still choose 100% fruiting bodies for mushrooms that produce them? Because the primary problem with mycelium supplements isn't mycelium itself. It's mycelium on grain.

The Real Problem: Mycelium on Grain

Most companies that use mycelium-based products grow their mycelium on a grain substrate, typically rice, barley, oats, or wheat, because it's fast, cheap, and scalable. The problem is that mycelium is essentially impossible to separate from whatever it's grown on.

That means when a company grinds that substrate into powder, you're not getting a mushroom supplement. You're mostly getting grain. Analysis of commercial mycelium-on-grain products has found 35 to 40% starch content, closely tracking the nutritional profile of the grain substrate itself, with only trace amounts of actual fungal biomass.

The result is a product that is largely grain filler, low in beta-glucans, and lacking the secondary metabolites like triterpenes that fruiting bodies naturally produce.

At Everyday Dose, we don't take that shortcut. We use 100% fruiting bodies for mushrooms that produce them, and wild-harvested sclerotia for chaga, because the quality difference is significant even if it's harder and more costly to produce.

Side-by-Side Comparison

How Can You Tell Which Part Was Used?

Supplements are not regulated by the FDA the same way medications are. That means companies aren't required to prove their ingredients match the label, and many don't volunteer this information.

Here's what to look for:

✅ "100% fruiting bodies" for mushrooms like lion's mane, reishi, and cordyceps

✅ "Wild chaga sclerotia" or "chaga conk" for chaga specifically

❌ "Mycelium" or "mycelial biomass" without further context

❌ "Full spectrum mushrooms," which is often marketing language for a mycelium-on-grain blend with an unknown ratio

❌ "100% fruiting body chaga," which signals either a mislabeled product or a cultivated substitute

❌ No mention of the part used at all, which is a transparency red flag

Trustworthy companies will be specific about what part of the mushroom they use, how it was grown, and whether it's been third-party tested.

What Else Should You Look For in a Mushroom Supplement?

Extract vs. Powder

Mushroom powders are made by grinding dried mushrooms into fine powder. Mushroom extracts are made by soaking mushrooms in hot water and/or alcohol, a process called double extraction.

Why does this matter? The bioactive compounds in mushrooms (polysaccharides, triterpenes) are locked inside a structural material called chitin, the same substance that makes up insect exoskeletons. Chitin is indigestible. Hot water breaks down chitin, releasing the beneficial compounds inside.

Alcohol extraction pulls out an additional class of compounds, triterpenes and other fat-soluble actives, that hot water alone can't access.

At Everyday Dose, all of our mushrooms and fungal ingredients go through a full double extraction process to ensure you're actually absorbing what's on the label.

Grain-Fed vs. Wood-Fed Mushrooms

In nature, mushrooms grow on trees and decaying wood matter. Commercial cultivation often substitutes grains for speed and cost, but grain-fed mushrooms can produce weaker fruiting bodies with lower concentrations of beneficial compounds. In some cases, grain-fed mushrooms may not produce fruiting bodies at all, meaning the final product is mycelium by default.

Our mushrooms are grown on wood or sawdust, the substrate closest to what they consume in the wild. And our chaga is wild-harvested from birch trees, not cultivated on an artificial substrate.

Types of Mushrooms and Fungi Used

Different fungi have different strengths. Here are the most common functional varieties and what they're studied for:

Lion's Mane: Mental clarity, mood balance, gut health (prebiotic fiber), and the body's natural detox processes

Chaga (wild sclerotia): Antioxidant content, immune support, and long-term wellness

Reishi: Healthy inflammatory response, gut microbiome support

Cordyceps: Endurance, energy, immunity, and heart health (long-used in Traditional Chinese Medicine)

Shiitake: Blood sugar balance, immune support, antimicrobial properties

Oyster: Heart health, healthy cholesterol levels, immune response

Turkey Tail: High antioxidant content, immune support

Frequently Asked Questions

What is the difference between mycelium and a fruiting body? Mycelium is the dense underground network of fungal threads, the "root system" of the mushroom. The fruiting body is the visible above-ground mushroom. Both are parts of the same organism, but they differ significantly in their concentration of bioactive compounds.

Do fruiting bodies have more beta-glucans than mycelium? Yes, substantially. Fruiting body extracts typically contain 30% or more beta-glucans, while mycelium-on-grain products often contain as little as 1 to 5%, largely because the grain substrate makes up 35 to 40% of the final product by weight.

What does "mycelium on grain" mean? It means the mycelium was grown on a grain substrate (rice, barley, oats) and then the entire mixture, grain included, was dried and powdered. Because mycelium can't be separated from grain, the final supplement is mostly grain starch, not mushroom.

Is "full spectrum mushroom" a good thing? Not necessarily. "Full spectrum" is often used to describe products that contain both fruiting body and mycelium-on-grain, but there's no required disclosure of the ratio. At worst, it's a mostly-grain product with trace mushroom content.

How do I know if a mushroom supplement uses fruiting bodies? Look for an explicit label claim: "100% fruiting bodies." If the label says "mycelium," "mycelial biomass," "full spectrum," or doesn't specify, assume it contains grain-grown mycelium.

Does chaga have a fruiting body? No. Chaga is not a true mushroom and does not produce a fruiting body. The part used in supplements is the sclerotia, also called the conk, a dense mass of fungal tissue that grows on the surface of birch trees. High-quality chaga supplements should specify "wild chaga sclerotia" or "chaga conk," not "fruiting body."

What is double extraction in mushroom supplements? Double extraction uses both hot water and alcohol to pull out the full range of bioactive compounds from mushrooms and fungi. Hot water releases water-soluble polysaccharides like beta-glucans, while alcohol extraction captures triterpenes and other fat-soluble actives that hot water alone can't access.

The Bottom Line

Mycelium is the living body of the fungus, but when it comes to supplement quality, the fruiting body wins on bioactive concentration, traditional use, and extractability for most functional mushrooms. The real issue isn't mycelium itself. It's the industry-wide practice of using mycelium grown on grain, which delivers mostly starch with minimal mushroom content.

Chaga is the exception worth knowing about. It doesn't produce a fruiting body at all, which means any brand claiming "fruiting body chaga" is either mislabeling their product or using a cultivated substitute that doesn't reflect centuries of traditional use.

At Everyday Dose, we use 100% wood-grown fruiting bodies for our mushrooms and wild-harvested sclerotia for our chaga. Our Mushroom Coffee+ blend features double-extracted lion's mane fruiting body and wild chaga sclerotia alongside collagen protein, L-theanine, and coffee extract. Because the ingredients in your daily ritual should actually do something.

Shop Mushroom Coffee+

Sources: Mycelium: Exploring the hidden dimension of fungi | Kew What Is a Fruiting Body? | University of Illinois Chitin Nanopaper from Mushroom Extract | ACS Sustainable Chemistry & Engineering Mushroom cultivation | MRCA Mycelium vs. Fruiting Bodies of Edible Fungi — A Comparison of Metabolites | PMC