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The rapid growth of the functional mushroom industry has brought renewed attention—and confusion—to how mushroom ingredients are sourced and labeled. A recent article by members of the Functional Mushroom Council (FMC) addresses one of the most persistent myths in the category: that only mushroom fruiting bodies have functional value, while mycelium does not.
According to FMC members, this claim is biologically inaccurate and unsupported by modern science. Both mushroom fruiting bodies and mushroom mycelium are metabolically active stages of the fungal life cycle, each producing distinct and beneficial compounds.
As mushroom pioneer Steve Farrar, Founder of M2 Ingredients, explains:
“Mushrooms belong to the Fungi kingdom. Plants belong to the Plant kingdom. The biological differences between a mushroom’s mycelium and fruiting body are minor compared to the massive distinctions between plant roots, leaves, stems, and fruit.”
Different compounds occur in different stages: For example, Lion’s Mane mycelium contains erinacines linked to nerve growth factor, while the fruiting body contains hericenones. Reishi fruiting bodies contain triterpenes not present in mycelium.
Full-spectrum cultivation matters: In modern controlled fermentation, mycelium consumes and transforms its growth substrate, converting it into fungal biomass rich in bioactive compounds—similar to processes used to make tempeh or yogurt.
Peer-reviewed research supports efficacy: Studies cited in the article show immune, gut, and cognitive health benefits from full-spectrum mushroom ingredients containing both mycelium and fruiting bodies, including human clinical trials.
The FMC article also cautions against simplistic marketing claims such as “fruiting body only” or “no filler,” noting that these phrases often misrepresent fungal biology and ignore decades of peer-reviewed research.
Rather than focusing solely on labels or sourcing slogans, the authors argue the more important question is:
Does the ingredient work—and is it supported by transparent, U.S.-based scientific research?
Read the full article by the Functional Mushroom Council members (originally published by Nutreceutical Business Review) Read Here
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