Medicinal Properties of Mushrooms: Nature's Healing Remedies in Folk Medicine

Mushrooms have been valued for their medicinal properties since ancient times, long before mycology — the science of fungi — even existed.

Cap-forming mushrooms were used in folk medicine as a genuinely effective remedy against a wide range of ailments. Today that traditional knowledge is being confirmed and expanded by laboratory research into the bioactive compounds fungi produce, from beta-glucans to fungal proteins.

Therapeutic Properties of Mushrooms: An Overview

The therapeutic value of mushrooms rests on a rich mix of bioactive molecules — polysaccharides, triterpenes, phenolic compounds and specialized proteins — that support immunity, calm inflammation, protect cells from oxidative damage and, in several species, act against tumor growth. A review published in the International Journal of Molecular Sciences (MDPI) by Giuseppe Venturella of the University of Palermo and colleagues catalogues dozens of species whose extracts show measurable pharmacological activity, spanning immunomodulatory, antimicrobial, antioxidant and anticancer effects.

These benefits appear in two distinct contexts: mushrooms as everyday food and mushrooms as concentrated supplements. Culinary species such as Agaricus bisporus (the white button, cremini and portobello all being growth stages of the same fungus) contribute nutrients and modest amounts of bioactive compounds through the diet, while medicinal species such as Reishi, Lion's Mane and Turkey Tail are usually taken as extracts standardized for their active fractions.

Historical Use of Mushrooms in Folk Medicine

Folk healers relied on mushrooms centuries before their chemistry could be explained, and many of their remedies map neatly onto compounds later isolated in the laboratory. This long empirical tradition is one reason mushrooms remain a productive source of new medicines today.

Ancient Remedies from 'Lechebniki' and 'Vertogrady'

Roughly 300 years ago, Russian herbal manuals known as the "Lechebniki" and "Vertogrady" recorded specific mushroom-based treatments:

• frostbitten tissue was treated with an extract of porcini (white mushrooms);
• cholera was treated with a minute dose of the death cap;
• tuberculosis (consumption) was treated with the peppery milk-cap;
• sciatica and lower-back pain were treated with water and alcohol infusions of the red fly agaric.

These practices sit within a much broader global tradition. In Traditional Chinese Medicine, functional mushrooms such as Ganoderma lucidum (Reishi, also known as Ganoderma lingzhi) and Coriolus versicolor have been used in China for more than two millennia to support vitality, immunity and longevity.

Bioactive Compounds in Mushrooms

The medicinal activity of mushrooms comes from a family of naturally produced molecules concentrated in the fruiting body and mycelium. Understanding these compounds explains why different species are used for different purposes.

Beta-Glucans, Triterpenes and Polysaccharides

Polysaccharides are the primary bioactive compounds in medicinal mushrooms, and among them β-glucans are the best studied. These long-chain sugar molecules, built from glucose units linked in characteristic 1,3 and 1,6 configurations, are recognized by receptors on immune cells and prime the body's defenses. Alongside them sit:

• Triterpenes and terpenoids — the bitter compounds abundant in Ganoderma that contribute anti-inflammatory, hepatoprotective and cholesterol-modulating effects;
• Phenolic compounds — antioxidants that neutralize free radicals;
• Ergosterol — the fungal sterol that converts to Vitamin D on exposure to UV light;
• Ergothioneine — a rare sulfur-containing amino acid and powerful cellular antioxidant found in unusually high amounts in mushrooms;
• Fungal Immunomodulatory Proteins (FIPs) and lectins — proteins that bind cell surfaces and adjust immune signalling.

Polysaccharide structures vary by species and even by growth conditions, which is why the polysaccharide profile of an extract is a key quality marker. Two of the most researched fractions — Polysaccharide Peptide (PSP) and PSK (Krestin) — are extracted from Coriolus versicolor and are discussed below.

Natural Antibiotics in Mushrooms

Many widely used antibiotics — penicillin, biomycin and others — are produced from specially cultivated mold fungi, and edible cap mushrooms carry their own antibiotic compounds. Researchers have established that nearly all cap-forming mushrooms contain, to a greater or lesser degree, substances with bactericidal properties. Notable examples include:

• a compound called hercenin found in porcini (white mushrooms), which relieves the pain of angina and boosts general vitality;
• the antibiotic lactarioviolin found in the saffron milk-cap;
• clitocybin, from the highly poisonous giant white funnel cap, which inhibits the growth of the tuberculosis pathogen and other disease-causing microbes;
• a resinous substance in certain larch boletes, used for gout, headaches and other conditions;
• the peppery milk-cap, applied in folk medicine for kidney-stone disease.

Antimicrobial and Bactericidal Properties

Mushrooms are a well-stocked pantry of bactericidal substances, and the champignon (a form of Agaricus bisporus) is a leading example — an extract from it sharply inhibits the development of typhoid pathogens. In living nature everything is balanced: for every harmful microorganism there is likely a substance capable of destroying it, and mushrooms are one of nature's richest natural reservoirs of such agents.

These antimicrobial effects arise from a combination of the antibiotic compounds noted above and the broader anti-inflammatory activity of mushroom terpenoids and phenolics, making certain species useful both against infection and against the inflammation that accompanies it.

Anti-Inflammatory and Antiviral Effects

The red fly agaric illustrates the anti-inflammatory tradition: despite its toxicity, water and alcohol infusions of it have long been used — and are still used — in folk medicine and homeopathic practice for sore throat, epilepsy, rheumatism and sciatica. Modern research attributes anti-inflammatory activity in edible and medicinal species to triterpenes and phenolic compounds that dampen inflammatory cytokine cascades.

Several mushroom polysaccharides and proteins also show antiviral potential in laboratory studies, interfering with viral replication or strengthening the immune response that clears infection. These effects are promising but remain largely at the preclinical stage and should not be read as a substitute for antiviral medicines.

Antioxidant Potential of Mushrooms

Mushrooms rank among the best dietary sources of the antioxidant ergothioneine, a compound the human body cannot make and must obtain from food. Combined with abundant phenolic compounds and selenium, this gives mushrooms a strong capacity to neutralize the free radicals implicated in ageing and chronic disease. Species such as oyster mushrooms, shiitake mushrooms and king oyster mushrooms are particularly rich sources.

The antioxidant mechanism works on two fronts: phenolic compounds donate electrons to quench reactive molecules directly, while ergothioneine accumulates inside cells and protects mitochondria and DNA from oxidative stress. This cellular protection underpins many of the longer-term benefits attributed to regular mushroom consumption.

Anticancer and Antitumor Properties

Some of the strongest scientific interest in medicinal mushrooms concerns their antitumor activity, an effect folk healers anticipated when they used black birch Chaga (Inonotus obliquus) infusions to treat tumors and gastrointestinal disease. Chaga's traditional reputation was famously dramatized by Alexander Solzhenitsyn in his novel Cancer Ward.

Apoptosis Induction in Cancer Cells

Mushroom polysaccharides and triterpenes can trigger apoptosis — programmed cell death — in cancer cells while sparing healthy tissue. Ribotoxins and other fungal proteins add a further mechanism, disrupting protein synthesis in abnormal cells and pushing them toward self-destruction. These pathways have been demonstrated repeatedly in cell and animal models for extracts of Ganoderma, Grifola frondosa (Maitake) and Trametes versicolor (Turkey Tail).

Cancer Prevention and Immune Function

Beyond direct action on tumor cells, mushrooms may lower cancer risk by strengthening immune surveillance. The best-known clinical example is PSK (Krestin), a protein-bound polysaccharide extracted from Coriolus versicolor, which is used in Japan as an adjuvant alongside conventional cancer treatment. Epidemiological studies have also linked higher mushroom consumption with reduced cancer risk, an association thought to reflect the combined antioxidant, anti-inflammatory and immune-supporting effects of the whole food.

Immune-Boosting Effects of Medicinal Mushrooms

The immunomodulatory action of mushrooms is driven chiefly by β-glucans and Fungal Immunomodulatory Proteins, which activate macrophages, natural killer cells and other defenders through cytokine signalling. Rather than simply "stimulating" immunity, these compounds help balance it — enhancing the response to threats while calming overreaction. Lectins in mushrooms contribute by binding to immune-cell surfaces and modulating their behaviour.

Turkey Tail (Trametes versicolor, also called Coriolus versicolor) and Reishi (Ganoderma lucidum) are the species most associated with immune support, and both have been the subject of research at institutions including The Chinese University of Hong Kong. Reishi in particular is valued for its dual reputation as an immune tonic and a sleep-supporting adaptogen.

Cognitive Health and Dementia Prevention

Lion's Mane (Hericium erinaceus) is the mushroom most closely tied to brain health, thanks to compounds that stimulate the production of Nerve Growth Factor, a protein essential for the growth and maintenance of neurons. Early clinical work has explored its effect on mild cognitive impairment, with some trials reporting improved cognitive scores during supplementation.

Population research strengthens the case for mushrooms and cognition more broadly: observational studies associate regular mushroom eating with a lower likelihood of mild cognitive impairment and slower cognitive decline, an effect researchers attribute partly to ergothioneine's protective role in the brain. These findings position mushrooms as a promising, though not yet proven, dietary factor in reducing dementia and Alzheimer's disease risk.

Cardiometabolic Disease Risk Reduction

Mushrooms can support heart and metabolic health in several complementary ways. Their β-glucans and triterpenes help reduce cholesterol, they are naturally very low in sodium — useful for managing sodium intake and blood pressure — and their savory umami flavor makes them an effective low-calorie substitute for red meat, cutting saturated fat and calories in a meal. The Mushroom Council in the United States has promoted "blending" mushrooms into ground meat dishes for exactly this reason.

The umami effect comes from naturally occurring glutamate; mushrooms deliver the same satisfying taste as monosodium glutamate without the added sodium. Swapping a portion of meat for mushrooms therefore addresses cardiometabolic disease risk on multiple fronts at once — fewer calories, less saturated fat, more fibre and more antioxidants.

Key Medicinal Mushrooms and Their Uses

Different mushroom species carry distinct therapeutic profiles, so choosing the right one depends on the goal. The species below range from common edibles to specialized medicinal fungi.

Porcini (White Mushroom) and Hercenin

Porcini contain hercenin, the compound that relieves angina pain and raises overall vitality, and an extract of porcini was historically applied to frostbitten tissue. As a food they are also prized for their intense flavor and nutritional density.

Chaga: Digestion and Skin Health

Black birch Chaga (Inonotus obliquus) enjoys wide popularity in folk medicine, where infusions prepared from it are used to treat various digestive-tract disorders and a range of tumors. Modern users also take Chaga for skin health, drawn to its high concentration of antioxidants and melanin. Its digestive and cellular-protective reputation reflects the same phenolic and polysaccharide chemistry seen across medicinal fungi.

Red Fly Agaric in Homeopathic Practice

The familiar red fly agaric is popularly used not only to kill flies but, in carefully prepared water and alcohol infusions, in folk medicine and homeopathic practice for sore throat, epilepsy, rheumatism and sciatica. Because the raw mushroom is toxic, such uses belong strictly to trained practice and are noted here for their historical and pharmacological interest.

Champignon and Its Bactericidal Compounds

The champignon is a storehouse of bactericidal substances, and an extract from it dramatically inhibits the growth of typhoid pathogens. As the cultivated form of Agaricus bisporus, it is also the world's most widely eaten mushroom, sold as white button, cremini and portobello (portabella).

Cordyceps: Energy and Athletic Performance

Cordyceps is taken for energy and athletic performance, valued for compounds thought to improve the body's use of oxygen and its production of ATP, the cellular energy currency. Wild Cordyceps sinensis grows on the Himalayan Plateau and is famously rare and expensive, which has raised sustainability and authenticity concerns; most modern supplements therefore use cultivated Cordyceps militaris, which can be produced reliably and tested for consistency.

Coriolus versicolor: History and Traditional Asian Use

Coriolus versicolor (also called Trametes versicolor and known in the West as Turkey Tail) has a long history of use across Asia, where it features in Traditional Chinese Medicine. It is the source of the two most clinically studied mushroom polysaccharide fractions — PSK (Krestin), developed and used in Japan, and Polysaccharide Peptide (PSP), developed in China — both prepared by hot-water extraction from the mushroom and used to support immune function during illness.

Puffballs as Wound-Healing Agents

Various species of puffballs (dozhdeviki) have genuine healing properties: the spores of these mushrooms have traditionally been used as a haemostatic and wound-healing remedy applied directly to bleeding cuts. The autumn honey fungus, another common woodland species, was used as a mild laxative.

In practice, nearly every kind of mushroom contains one or another medicinal substance.

Clinical Trials and Human Evidence

The strongest human evidence for medicinal mushrooms concerns Coriolus versicolor: PSK and PSP have been evaluated in cancer patients as adjuvants to standard therapy, with several trials reporting improved immune markers and survival in specific cancers. Smaller clinical studies of Lion's Mane for cognition and Reishi for immune and sleep outcomes have produced encouraging but preliminary results.

Most other claims still rest on laboratory and animal research rather than large, rigorous human trials, so clinical efficacy for many popular uses remains unproven. Reviews such as those in the International Journal of Molecular Sciences consistently call for well-designed, adequately powered human studies before firm health claims can be made.

Cooking Methods and Nutrient Preservation

How mushrooms are prepared affects how much of their nutrition and bioactive content survives. The Culinary Institute of America and food scientists at UC Davis have noted that dry-heat methods such as roasting, grilling and sautéing tend to concentrate flavor and preserve nutrients better than boiling, which leaches water-soluble compounds into the cooking liquid. A few practical points:

• Cooking breaks down tough cell walls, making β-glucans and other compounds more bioavailable — mushrooms should generally be eaten cooked, not raw.
• Brief, high-heat cooking retains more antioxidants than prolonged boiling.
• Exposing sliced mushrooms to UV light (including sunlight) before cooking sharply raises their Vitamin D content, as ergosterol converts to the vitamin.
• If you boil mushrooms, use the liquid — as in a broth — to recover the dissolved nutrients.

Dietary Supplements and Nutraceutical Applications

Beyond the kitchen, functional mushrooms are sold as nutraceuticals — capsules, powders, tinctures and extracts marketed for immunity, cognition, energy and general wellness. In these mycotherapy products the crucial distinction is between extracts made from the fruiting body and products made from myceliated grain, where the fungus is grown on grain and the whole mass is dried and powdered together.

Genuine extracts concentrate the active β-glucans and other compounds from the mushroom itself, whereas myceliated-grain products can be diluted with the starch of the leftover grain substrate. To identify authentic supplements and avoid grain fillers:

• look for products labelled as made from fruiting bodies, or that specify the mushroom part used;
• check for a stated β-glucan percentage rather than only "polysaccharides", which can include grain starch;
• favour brands — Real Mushrooms is one widely cited example — that publish independent lab results;
• insist on quality standards and third-party testing that verify potency and screen for contaminants.

You can work supplements into a daily routine by stirring an extract powder into coffee, tea or a smoothie, or by taking standardized capsules with meals.

Safety, Dosage and Precautions

Dosage for mushroom supplements depends on the species and the concentration of the extract, so the product label and a qualified practitioner are the best guides; typical extract doses range from about one to three grams per day, though standardized products vary widely. As food, mushrooms are low in calories and a useful source of B vitamins including vitamin B6, selenium, and — after UV exposure — Vitamin D.

Food safety is the paramount concern with wild mushrooms: several traditional remedies described above rely on species that are toxic or even lethal, and misidentification of wild mushrooms can be fatal. Never forage or self-treat with wild fungi without expert identification, discuss supplements with a healthcare provider if you take medication or have a health condition, and treat mushroom products as a complement to, not a replacement for, medical care.

Conclusion

In living nature everything is balanced: for every harmful microorganism there is almost certainly a substance able to destroy it — and it is fortunate when such substances can be drawn from nature's own reservoirs, including the medicinal properties of mushrooms. From the folk remedies of the old herbals to modern clinical extracts like PSK, mushrooms continue to prove themselves a remarkable source of compounds for preventing and managing human disease, provided they are used with knowledge and care.