Medicinal mushrooms have been used for thousands of years, and modern interest centres on a specific class of compounds: beta-glucans, complex polysaccharides in the mushroom cell wall that the immune system recognises. The crucial — and often-hidden — issue with this category is quality, so it's worth understanding what actually makes an extract work. Our mushroom collection covers the most studied species.

How they work — and why quality is everything

Beta-glucans aren't immune stimulants so much as immune trainers: they bind receptors (such as dectin-1) on the immune cells concentrated in the gut wall, helping "prime" the innate immune response. The weak point is the supply chain. Much of the cheap mushroom powder on the market is mycelium grown on grain, then dried with the grain — so the "polysaccharide" figure on the label is often largely starch, not beta-glucan. Look for fruiting-body extracts standardised to beta-glucans (not just "polysaccharides"), ideally dual-extracted (hot water pulls the water-soluble beta-glucans; alcohol pulls the fat-soluble triterpenes).

• Reishi — calming, adaptogenic; its triterpenes are valued for stress and sleep. See Adrenal & Nervous System Support.
• Lion's Mane — of interest for nerve and cognitive support. See Nootropics.
• Cordyceps — traditionally used for stamina and oxygen utilisation. See Energy.
• Turkey Tail, Shiitake & Chaga — rich in beta-glucans, traditionally used for immune support. See Immunity.

Frequently asked questions

What are beta-glucans? The mushroom cell-wall polysaccharides the immune system recognises — the most studied class of mushroom actives.
Fruiting body or mycelium? Fruiting-body extracts are generally richer in beta-glucans; mycelium-on-grain products can be diluted with starch.
Why "dual-extracted"? Because beta-glucans are water-soluble and triterpenes are alcohol-soluble — extracting both captures the full spectrum.

Browse our full medicinal mushroom collection below. Always read the label and use only as directed. If symptoms persist, consult your healthcare professional.