Functional mushroom supplements have grown significantly in popularity, and with that growth has come a flood of products making bold promises on their labels. For consumers hoping to make informed choices, the terminology on these labels, including terms like beta-glucans, polysaccharides, hot-water extract, and dual extract, can be genuinely confusing. Understanding what these terms mean, and what the underlying research suggests, may help you evaluate whether a product is likely to deliver meaningful benefit.
What Are Polysaccharides?
Polysaccharides are complex carbohydrates made up of long chains of sugar molecules. In functional mushrooms, polysaccharides are considered the primary class of bioactive compounds and include a subgroup called beta-glucans. Research suggests that certain mushroom polysaccharides may interact with receptors on immune cells, potentially influencing inflammatory signaling pathways.[1]
When a supplement label states “contains polysaccharides,” this is a broad claim. Not all polysaccharides in a mushroom product are biologically active. Starch, for example, is also a polysaccharide but does not carry the same potential immune-modulatory properties associated with beta-glucans. A label listing only total polysaccharide content without specifying beta-glucan percentage provides limited useful information.
Beta-Glucans: The More Specific Marker
Beta-glucans are a specific type of polysaccharide characterized by beta-1,3 and beta-1,6 glycosidic linkages. These structural features are believed to be important for their potential biological activity. Studies indicate that beta-glucans from mushrooms may activate immune cells including macrophages and natural killer cells by binding to receptors such as Dectin-1.[1]
Beta-glucan content varies considerably between mushroom species. Research analyzing the glucan profiles of Lion’s Mane (Hericium erinaceus) and Shiitake (Lentinula edodes) found that beta-glucan concentrations differed substantially depending on the strain and cultivation method, with Shiitake strains in that study ranging from roughly 13% to 26% beta-glucan by dry weight.[2] This variability underscores why a standardized beta-glucan percentage on the label carries more weight than a general polysaccharide claim.
Alpha-Glucans vs. Beta-Glucans
One nuance worth understanding is the distinction between alpha-glucans and beta-glucans. Alpha-glucans, such as starch and glycogen, are common energy storage compounds and do not carry the same potential immune benefits associated with beta-glucans. Some supplement manufacturers list total glucan content without breaking out the alpha and beta fractions. A product with a high total glucan figure that is primarily composed of alpha-glucans from grain-based substrate filler may be less relevant from a functional perspective than a product with a lower but fully beta-glucan-verified figure.
The same research comparing Lion’s Mane and Shiitake found that Shiitake strains exhibited notably higher alpha-glucan content as well, at up to 5.5% compared to 0.67% for Lion’s Mane.[2] When evaluating labels, look specifically for the term “beta-glucan” rather than relying solely on total glucan or total polysaccharide figures.
Extraction Methods and What They Mean
The extraction method used to produce a mushroom supplement affects which compounds are present in the final product and in what concentrations. Common extraction terms you may see on labels include:
Hot-Water Extract
Hot-water extraction is the most common method for capturing polysaccharides, including beta-glucans. Because beta-glucans are water-soluble, this process is generally considered suitable for preserving these compounds. Research on five edible mushroom polysaccharides found that after simulated gastrointestinal digestion, hot-water-extracted polysaccharides retained adequate structural integrity, suggesting the compounds may remain available as they pass through the digestive tract.[3]
Alcohol (Ethanol) Extract
Alcohol extraction is used to capture compounds that are not water-soluble, such as triterpenes in Reishi and certain antioxidants. These compounds are associated with potential properties distinct from those of beta-glucans. An alcohol-only extract would be expected to contain minimal beta-glucans.
Dual Extract
A dual extract combines both hot-water and alcohol extraction, theoretically preserving a broader spectrum of bioactive compounds. Products labeled as dual extracts may be appropriate when both polysaccharides and triterpenes are the target compounds, as with Reishi supplements. However, the term “dual extract” alone does not guarantee specific concentrations of either compound class.
Extract Ratio and Concentration
Labels may indicate an extract ratio such as 10:1 or 20:1. This notation means that a given quantity of extract was concentrated from a larger quantity of raw material (e.g., 10 grams of mushroom reduced to 1 gram of extract). A higher ratio is sometimes interpreted as indicating greater potency, but this is not always accurate. A concentrated extract of low-quality or low-beta-glucan material remains a low-quality product regardless of its extraction ratio. Standardized beta-glucan content is a more informative marker than extract ratio alone.
Fruiting Body vs. Mycelium
Mushroom supplements may be produced from the fruiting body (the visible mushroom structure), the mycelium (the root-like vegetative structure), or both. Labels should clearly indicate which part of the organism was used. Products derived from mycelium grown on grain substrates may contain residual grain material that contributes to alpha-glucan content without providing the beta-glucan fraction associated with the fruiting body. Checking whether a product specifies fruiting body sourcing, and whether it provides independent third-party testing for beta-glucan content, offers a more complete picture of what you are purchasing.
Third-Party Testing and Certificates of Analysis
A certificate of analysis (COA) from an independent laboratory is one of the more meaningful indicators of product quality. A COA should confirm the beta-glucan percentage, check for heavy metals, verify the absence of microbial contamination, and ideally confirm the absence of pesticide residues. Reputable manufacturers typically make COAs available upon request or publish them on their website. If this documentation is not available, that absence is worth factoring into a purchasing decision.
It is also worth noting that not all testing methodologies are equivalent. Some assays measure total glucan content and require a secondary calculation to isolate beta-glucans by subtracting alpha-glucan values. The Megazyme method is one commonly referenced standard for this purpose, and products tested using recognized analytical methods provide a stronger basis for comparison.
Serving Size and Daily Beta-Glucan Intake
Labels list serving sizes that can vary widely between products. Comparing the beta-glucan content per serving, rather than per capsule, provides a more useful benchmark. Some clinical studies have used specific quantities in their protocols, though it would be inaccurate to extrapolate a universal recommended dose from any single study. If a particular research trial is cited on a label, reviewing the original publication to understand the context and dosage used in that study may help you assess the claim being made.
For more information on how mushroom supplements may interact with medications you are already taking, see our overview: Mushroom Supplements and Drug Interactions: What to Know Before You Start.
Summary
When evaluating a functional mushroom supplement label, the most informative data points include a specified beta-glucan percentage (not just total polysaccharides), clarity on whether the product uses fruiting body or mycelium, the extraction method used, and the availability of third-party testing documentation. These details collectively provide a more reliable basis for comparison than marketing language alone. As with any supplement, consulting a qualified healthcare provider before starting use is advisable, particularly for individuals managing existing health conditions.
References
- Case S, et al. Beta-glucans from Agaricus bisporus mushroom products drive Trained Immunity. Front Nutr. 2024;11:1346706. PMID 38425482
- Keerthana CS, et al. Unveiling the glucan profile: a comparative study of Lion’s Mane and Shiitake mushrooms. Nat Prod Res. 2026;40(9):2627-2630. PMID 40407020
- Xu C, et al. Physicochemical, structural, digestive stability, and microbiota effects of five edible mushroom polysaccharides. Int J Biol Macromol. 2026;362:152108. PMID 42019840
Disclaimer: The information in this article is intended for educational purposes only and does not constitute medical advice. Mushroom supplements are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before adding any supplement to your routine.
