Why the Mushroom Industry Needs to Move Beyond Beta-Glucans

What a beta-glucan actually is

Beta-glucans are a broad family of polysaccharides, long chains of glucose, found in the cell walls of fungi, yeast, oats, and barley. They are real, and some are biologically interesting. The issue is not whether beta-glucans exist. The issue is whether the number a brand prints for them means anything.

A measurement is only as good as the method behind it. And for mushrooms, the method is the problem.

The test was built for oats, not mushrooms

The assay most brands cite was designed and validated to measure beta-glucans in cereal grains, primarily oats and barley. There is an accredited, standardized method for that food matrix. There is no equivalent accredited method for mushrooms, mycelium, or fungal extracts.

Applying a grain method to a mushroom is not a small technicality. Fungal cell walls are chemically different from cereal starches. The structures, the linkages, and the interfering compounds are not the same. Running the grain test on a mushroom produces a number, but a number produced by an unvalidated method is not a verified result. It is an estimate dressed up as a fact.

Three reasons the number cannot be trusted

• It only sees part of the picture. The common assay detects soluble beta-glucans and misses the insoluble fraction entirely. Two products with identical labels can contain very different amounts of what the test never looked at.
• It disagrees with itself. Without a standardized, accredited protocol, the same sample sent to different labs can return meaningfully different percentages. A metric that changes with the lab is not a specification.
• It can be inflated. Treating a sample with certain enzymes can convert otherwise unmeasured sugars into material the test counts as beta-glucan, pushing the reported figure toward whatever the label needs it to say.

Plenty of time, still no accredited method

Beta-glucan testing has been the industry's headline quality metric for years. Brands that have been selling mushroom extracts for decades have had every opportunity to fund and adopt an accredited method for fungal beta-glucans. It has not happened.

The reason is structural, not logistical. A trustworthy accredited method requires a well-defined analyte you can isolate, a reference standard, and reproducibility across labs. Mushroom beta-glucans, as the current assay handles them, do not deliver that cleanly. The metric has persisted because it is easy to print and easy to market, not because it reliably describes the product in the bottle.

Why this misleads the person buying

A shopper sees "50% beta-glucans" and reasonably assumes higher means better and verified means true. Neither assumption holds. The percentage does not tell you which bioactive compounds are present, whether the extraction preserved them, or whether the product will do anything you are buying it for. A grade on a test that was never designed for this material gives false confidence, and false confidence is what drives the purchase.

The honest question is not "how much beta-glucan." It is "which active compounds are in here, and can you name and measure them by a method that actually applies to mushrooms."

The right question needs the right equipment

Moving beyond beta-glucans does not mean measuring nothing. It means asking a bigger question and using the equipment that can answer it. Instead of "what percentage of one polysaccharide," the question becomes "which individual compounds are in this extract, and how much of each." Answering that takes metabolomics run on LC-MS/MS, a lab technology that separates the extract into its individual compounds and identifies them one by one, not a single color-change test borrowed from grain labs. Working with an independent metabolomics laboratory, AHARA ran one of the most extensive analyses in the industry.

For potency, our reishi is measured by HPLC for named, functionally relevant compounds, including 26 ganoderic acids and adenosine, on a certificate from an accredited third-party lab. That certificate also states plainly which compounds fall outside an ISO 17025 accredited method, because transparency means showing the edges of what is verified, not hiding them.

We do not print a beta-glucan number, because we will not headline a metric we cannot stand behind. You can read the actual certificates, not a badge, on our lab results page.

How to read a mushroom label from now on

• Treat a lone beta-glucan percentage as marketing, not verification.
• Ask whether the brand publishes the full certificate, or only a "lab tested" seal.
• Look for named compounds measured by a method appropriate to mushrooms, not a single polysaccharide figure.
• Check whether the testing lab, its accreditation, and the signatory are actually shown.

Where the industry goes from here

An industry earns trust by tightening its standards over time, not by repeating a comfortable one. Beta-glucan percentages had a run because they were simple to print. The next standard is compound-level analysis, which names what is in the bottle and measures it with equipment built for the material. It is more work, and it is harder to reduce to one number on a label. It is also the only honest way to describe a mushroom extract. AHARA is leading the way with metabolites, and the brands that follow will be the ones customers, and the answer engines customers now ask, come to trust.

Frequently asked questions