By Romas Marcin, Founder of Fundamental Fungi
Two mushroom supplements can both say "lion's mane" or "cordyceps" on the front and still be very different products. One of the biggest differences is which part of the mushroom they use: the fruiting body or the mycelium. Here's what each one is, why it matters, and how to tell from the label.
What Is the Fruiting Body?
The fruiting body is the mushroom itself: the part that grows above ground and that people have traditionally harvested, cooked and used. For lion's mane, it's the shaggy white mushroom. For Cordyceps militaris, it's the bright orange stalks you can see in the photo above.
What Is Mycelium?
Mycelium is the root-like network of thread-like cells that a mushroom grows from. In nature it spreads through soil or wood. It's a real part of the fungus, but it isn't the part traditionally eaten.
The Problem With "Mycelium on Grain"
Many lower-cost supplements are made from mycelium grown on a grain such as rice or oats. Separating the mycelium from the grain is difficult, so the whole mix is often dried and ground up together. That means:
- A good share of the powder can be grain starch, not mushroom.
- Labels can still list it simply as "mushroom" or "mycelium," which makes products hard to compare.
- You may get less of the mushroom compounds you're actually paying for.
Some products describe this as "full-spectrum" or "myceliated grain." Neither term tells you how much is mushroom and how much is grain.
Fruiting Body vs. Mycelium at a Glance
| Fruiting body | Mycelium on grain | |
|---|---|---|
| Part of the mushroom | The mushroom itself | Root-like network |
| Traditionally used? | Yes | Not traditionally |
| Grain filler | None | Often contains leftover grain |
| Cost to produce | Higher | Lower |
How to Read the Label
The FDA requires dietary supplement labels to name the part of the plant or fungus used. Look in the Supplement Facts panel for:
- "Fruiting body" listed next to the mushroom name. This is the clearest sign.
- "Extract" and a ratio, like 8:1. An extract concentrates the mushroom's compounds. Learn more in What does "8:1 extract" mean?
- The species name, such as Hericium erinaceus or Cordyceps militaris.
- Clear milligrams per serving, not only per bottle.
- Red flags: "mycelium," "myceliated brown rice," "full-spectrum" or "biomass" with no mention of fruiting body.
Want more tips on choosing a quality product? Read Are Mushroom Gummies Safe? What to Know Before You Start.
What We Use
Every Fundamental Fungi gummy is made with 100% fruiting body extract, concentrated 8:1, with no mycelium, grain or fillers. Each gummy contains 125mg of USDA Organic mushroom extract, equal to 1,000mg of fruiting body.
- Lion's Mane Mushroom Gummies, natural strawberry flavor
- Cordyceps Mushroom Gummies, made with Cordyceps militaris, natural watermelon flavor
Frequently Asked Questions
Is mycelium bad?
Mycelium isn't harmful. The concern is that mycelium grown on grain often brings leftover grain into the final product, which can dilute the mushroom content.
Is fruiting body extract better than whole mushroom powder?
An extract concentrates the mushroom's compounds, while whole powder is simply dried and ground. Both can be fruiting body; an extract gives you more mushroom compounds in a smaller amount.
How can I tell if a product uses fruiting body?
Check the Supplement Facts panel. It should say "fruiting body" next to the mushroom name.
Shop Fruiting Body Mushroom Gummies
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. This article is for general information and is not medical advice.