Beta-Glucan
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound | Beta-glucan — a name covering at least two distinct polysaccharide classes |
|---|---|
| Cereal type | (1→3),(1→4)-β-D-glucan — linear, soluble, viscous (oat, barley) |
| Fungal/yeast type | (1→3),(1→6)-β-D-glucan — branched, particulate (mushroom, yeast) |
| CAS | 9051-97-2 and related — CAS numbers do not reliably distinguish the classes |
| Cereal mechanism | Luminal viscosity → bile acid sequestration and slowed glucose absorption |
| Fungal mechanism | Pattern recognition via Dectin-1 and CR3 on innate immune cells |
| Claim strength | High for the mechanism separation; High that viscosity governs the cereal effect |
| Buy from Herbuno | Beta-Glucan 70% (Oat) — cereal type · Beta-Glucan 10% (Oat) — cereal type · Beta-Glucans 30% (Reishi) — fungal type · Beta-Glucans 30% (Turkey Tail) — fungal type |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot; phytosanitary on request |
Name origin: A beta-glucan is any polysaccharide of D-glucose joined by beta-glycosidic bonds. That definition is broad enough to be nearly useless as a specification, because it covers molecules with entirely different structures, solubilities, mechanisms and permitted claims. The commercial category inherits that ambiguity, and most sourcing errors in it follow directly from the shared name.
The two classes that matter: Cereal beta-glucans, from oat and barley, are linear chains of (1→3) and (1→4) linked glucose. They are water-soluble and form highly viscous solutions. Fungal and yeast beta-glucans, from mushrooms and from Saccharomyces cerevisiae, are (1→3) backbones with (1→6) branches. They are largely particulate rather than soluble and do not build viscosity. The difference in linkage produces a difference in physical behaviour, and the difference in physical behaviour produces entirely separate mechanisms of action.
Research trajectory: The two literatures developed independently and barely intersect. Cereal beta-glucan research concerns serum cholesterol and postprandial glycaemia, and has produced authorised health claims in the European Union and elsewhere tied to specific daily intakes of oat or barley beta-glucan. Fungal and yeast beta-glucan research concerns innate immune recognition, principally through the Dectin-1 receptor and complement receptor 3 on macrophages, neutrophils and dendritic cells. Neither literature supports the other's claims.
Commercial source: Oat and barley beta-glucan concentrates are produced by milling and fractionation or by aqueous and enzymatic extraction, typically at 10 to 80% beta-glucan. Mushroom beta-glucans are produced by hot-water or alkaline extraction of fruiting body or mycelium, typically standardised at 20 to 40%. Yeast beta-glucan is produced from brewer's or baker's yeast cell walls at 70 to 85%.
Evidence for Beta-Glucan Applications
Oat and mushroom beta-glucans are different compounds and their claims are not transferable. This is the governing fact in the category. Cereal (1→3),(1→4)-beta-glucan acts physically, by raising luminal viscosity; fungal (1→3),(1→6)-beta-glucan acts as a molecular pattern recognised by Dectin-1 and complement receptor 3 on innate immune cells. A cholesterol claim cannot be made on a mushroom or yeast beta-glucan, and an immune claim cannot be made on an oat beta-glucan. Keyword-matching "beta-glucans" across a catalogue produces exactly this error. Claim strength: High.
The cereal cholesterol effect is mechanistically physical, which means molecular weight and viscosity determine whether it works. Soluble cereal beta-glucan raises the viscosity of intestinal contents, which impedes micellar bile acid reabsorption and drives hepatic cholesterol consumption for bile acid resynthesis. Because the mechanism is viscosity, depolymerisation destroys the function: processing that reduces molecular weight — aggressive extraction, extended heating, shear, certain enzyme treatments — can leave a material that assays correctly for beta-glucan content and has little physiological effect. Assay alone does not establish functionality here. Claim strength: High.
That makes molecular weight a mandatory specification parameter for cereal beta-glucan, not an optional one. A certificate stating only beta-glucan percentage is insufficient for a material intended to carry a viscosity-dependent function. Request peak or weight-average molecular weight and, preferably, a viscosity measurement under stated conditions. Comparative work has consistently found higher molecular weight fractions more effective at equivalent dose, and low-molecular-weight material correspondingly less so. Claim strength: High.
The authorised cereal claims are tied to specific daily intakes and to the beta-glucan content, which drives the formulation arithmetic. European Union authorised claims for oat and barley beta-glucan on blood cholesterol require a daily intake of 3 grams of beta-glucan, with a further claim for postprandial glycaemic response at 4 grams per 30 grams of available carbohydrate. Those are substantial quantities: 3 grams of beta-glucan requires about 4.3 grams of a 70% concentrate, or 30 grams of a 10% material. A capsule format cannot realistically deliver the cholesterol claim. Claim strength: High.
Fungal and yeast beta-glucan immune pharmacology is real but the clinical outcome evidence is considerably weaker than the mechanism. Dectin-1 binding by (1→3),(1→6)-beta-glucan is well characterised, and downstream innate immune activation is reproducible in vitro and in animal models. Human trials on upper respiratory tract infection incidence and on immune markers exist and report mixed results, with heterogeneous preparations, doses and endpoints. Particle size, branching ratio, solubility and source organism all vary between preparations and plausibly affect activity, which is part of why the literature is inconsistent. Claim strength: Emerging to Moderate depending on the endpoint.
Mushroom beta-glucan standardisation carries its own trap, which is the alpha-glucan question. Many mushroom extracts are standardised by a total polysaccharide or "polysaccharide" figure that includes starch and other alpha-glucans from growing substrate, particularly where mycelium on grain is the source material rather than fruiting body. A 30% polysaccharide extract may contain far less than 30% beta-glucan. Specify beta-glucan specifically, by a method that distinguishes it from alpha-glucan, and specify fruiting body or mycelium explicitly. Claim strength: High.
Sourcing beta-glucan from Herbuno. We supply both classes and we label which is which, because they are not substitutes.
Cereal type, Avena sativa at 10% and 70%: this is the (1→3),(1→4) soluble viscous beta-glucan, and the class the cholesterol and glycaemic claims attach to. For those claims specify molecular weight or viscosity alongside assay, since the mechanism is physical and depolymerised material can assay correctly and do little. Fungal type, from Ganoderma, Trametes, Grifola and Hericium at 25–30%: this is the (1→3),(1→6) branched beta-glucan with the Dectin-1 pharmacology. Specify beta-glucan rather than total polysaccharide, by a method that excludes alpha-glucan from substrate. All lots ship with CoA and MSDS; request a quotation for pilot or bulk volumes.
Dosage & Formulator Specification
Dose on beta-glucan content, and note that the two classes sit at completely different scales. The authorised cereal claims require 3 grams of beta-glucan daily for the cholesterol claim and 4 grams per 30 grams of available carbohydrate for the postprandial glycaemic claim — so roughly 4.3 grams of a 70% oat concentrate, or 30 grams of a 10% material, for the former. Fungal beta-glucan trials have generally used tens to a few hundred milligrams daily. A single "beta-glucans" dose figure carried across both classes is meaningless.
Format follows from that arithmetic. Three grams of beta-glucan daily is a food or sachet format, not a capsule: at 70% concentrate it is roughly four to five 1-gram capsules, and at 10% it is impossible. Cereal beta-glucan belongs in beverages, porridges, bars and bakery, where its viscosity is also a texture contribution to be designed around rather than a side effect. Fungal beta-glucan at tens to hundreds of milligrams fits a capsule comfortably.
For cereal beta-glucan, viscosity is the functional specification and should be written in. Require weight-average or peak molecular weight by size-exclusion chromatography, and ideally a viscosity figure at a stated concentration, temperature and shear rate. Processing destroys this: extended heating, high shear, acid exposure and some enzyme treatments depolymerise the polymer while leaving total beta-glucan unchanged. That means the finished product needs validating, not just the raw material — a compliant ingredient can be rendered non-functional by the process it goes into.
For fungal beta-glucan, the specification priorities are different. Require beta-glucan assayed specifically rather than as total polysaccharide, by a method that distinguishes beta-glucan from alpha-glucan, because mycelium grown on grain substrate carries starch that inflates a total-polysaccharide figure. Specify fruiting body or mycelium explicitly, name the species, and require the extraction system, since hot-water and alkaline extracts differ in solubility and branching. Particle size matters for particulate preparations.
Handling differs between the classes. Cereal beta-glucan concentrates are hygroscopic and build viscosity rapidly on hydration, so they require controlled addition to avoid lumping and can be difficult to disperse at high inclusion; cold-water dispersion followed by hydration is usually better than hot addition. Fungal beta-glucan powders are generally free-flowing and disperse without viscosity build. Both are stable dry; cereal material is susceptible to enzymatic depolymerisation if endogenous or added beta-glucanase is present, which is a real risk in cereal-containing and fermented matrices.
Standard analytical coverage applies to both: heavy metals, microbiological limits, loss on drying, ash, and residual solvents where a solvent extraction is used. For mushroom material, specify the species by binomial and require it confirmed, since species substitution in the mushroom extract trade is a documented problem, and specify ergosterol or another marker where fruiting body authenticity matters. For cereal material, gluten is the relevant allergen question: oat beta-glucan from a dedicated line can be gluten-free, but oats are commonly handled with wheat, so the gluten status must be stated rather than assumed and tested rather than asserted.
Frequently Asked Questions — Beta-Glucan
Can I use any beta-glucan for a cholesterol claim?
No. The cholesterol claim belongs to cereal (1→3),(1→4)-beta-glucan from oat or barley, which works by raising luminal viscosity and impeding bile acid reabsorption. Mushroom and yeast beta-glucans are (1→3),(1→6) branched, largely particulate, build no viscosity, and act through Dectin-1 immune recognition instead. The claims are not transferable in either direction.
Why does molecular weight matter so much?
Because the cereal mechanism is physical. The effect comes from viscosity, so depolymerisation destroys it — aggressive extraction, extended heating, shear or certain enzyme treatments can leave material that assays correctly for beta-glucan and does very little. Request weight-average or peak molecular weight and, ideally, viscosity under stated conditions.
Is the raw material specification enough?
No, for cereal beta-glucan. Your process can depolymerise a compliant ingredient while leaving the assay unchanged, so the finished product needs validating too. Watch extended heating, high shear, acid exposure, and any endogenous or added beta-glucanase — a real risk in cereal-containing and fermented matrices.
Can I deliver the cholesterol claim in capsules?
Not realistically. The authorised claim requires 3 grams of beta-glucan daily — about 4.3 grams of a 70% oat concentrate, or 30 grams of a 10% material. That is a food, beverage or sachet format. Fungal beta-glucan at tens to hundreds of milligrams fits a capsule comfortably; cereal beta-glucan at claim level does not.
What is the mushroom standardisation trap?
Total polysaccharide figures that include alpha-glucan. Mycelium grown on grain substrate carries starch, so a "30% polysaccharide" extract may contain far less than 30% beta-glucan. Specify beta-glucan assayed by a method that distinguishes it from alpha-glucan, and specify fruiting body or mycelium explicitly.
Is oat beta-glucan gluten-free?
It can be, from a dedicated line, but it must be stated and tested rather than assumed. Oats are commonly handled and processed alongside wheat, so cross-contact is the default risk. Require the gluten status on the certificate with a test result, not an assertion.