What is Agaricus blazei Murill?

Agaricus blazei Murill (ABM) is a medicinal mushroom originally discovered in the Piedade region of Brazil, where the local population showed unusually low rates of cancer and chronic disease. It was introduced to Japan in the 1960s and quickly became one of the most widely used medicinal mushrooms in Japanese integrative oncology. Today it is cultivated and consumed across Brazil, Japan, and increasingly worldwide as a functional food and supplement.

How does Agaricus blazei Murill work?

ABM works primarily by activating the innate and adaptive immune systems through its high concentration of beta-glucans — long-chain polysaccharides that bind to receptors on immune cells like macrophages, natural killer (NK) cells, and dendritic cells, prompting them to become more active and vigilant. This immune-priming effect is thought to underlie both its cancer-supportive and antiviral properties. Its ergosterol content also supports vitamin D production, and its polysaccharides help moderate blood sugar by slowing glucose absorption and supporting insulin sensitivity.

What forms does Agaricus blazei Murill come in?

Hot water extracts and dried powder capsules are the most clinically studied forms. Hot water extraction is preferred for maximizing beta-glucan availability, as cell walls must be broken down for polysaccharides to be fully bioavailable. Whole dried mushroom in tea form is a traditional preparation still widely used in Brazil. Standardized extracts listing beta-glucan percentage are considered most reliable for therapeutic use.

Where it comes from:

Residents of Piedade, Brazil, near São Paulo, traditionally ate ABM as a daily food and were observed by visiting Japanese researchers in the 1960s to have exceptional health and longevity. Japanese scientists brought it back for cultivation and research, and it became deeply integrated into Japanese cancer care by the 1980s. In Brazil, it is known as 'Cogumelo do Sol' (Mushroom of the Sun) and remains a staple functional food in health-conscious communities.

What does Agaricus blazei Murill help with?

• Immune system weakness: ABM's beta-glucans directly stimulate macrophages, NK cells, and other front-line immune defenders, making them faster and more effective at identifying threats. This makes it one of the most well-supported natural immune activators available, particularly for people with weakened or suppressed immunity.
• Cancer support (during conventional treatment): ABM is widely used in Japan alongside chemotherapy and radiation, where it is thought to help protect immune function that is often damaged by conventional cancer treatments. Clinical studies in cancer patients have shown improved NK cell activity and better quality of life scores when ABM extract is taken alongside standard care.
• Type 2 diabetes and blood sugar: Several human trials have found ABM supplementation reduces fasting blood glucose and improves insulin sensitivity in people with type 2 diabetes. It appears to work by slowing glucose uptake in the gut and supporting the cells' ability to respond to insulin more effectively.
• High cholesterol: ABM has shown modest cholesterol-lowering effects in human trials, reducing LDL (bad) cholesterol while maintaining or improving HDL (good) cholesterol levels. This is likely due to its beta-glucan content, which can bind to bile acids in the digestive tract and reduce cholesterol recycling.
• Hepatitis and liver health: Studies in hepatitis B patients have found ABM extract can reduce liver enzyme levels (a sign of liver inflammation) and improve overall liver function markers. Its antioxidant and immune-modulating properties may help calm the chronic inflammatory state that characterizes viral hepatitis.
• Allergies and inflammation: ABM appears to modulate rather than simply stimulate immune responses, helping to calm overactive immune reactions like allergies. Some evidence suggests it reduces the type of inflammatory signaling that drives allergic and autoimmune conditions.
• Low energy and chronic fatigue: Users and some clinical reports describe improved energy and reduced fatigue with regular ABM use. This is likely connected to its immune-balancing effects, antioxidant content, and potential support for mitochondrial function.
• Oxidative stress and aging: ABM is rich in antioxidants including ergothioneine and polyphenols, which help neutralize free radicals that accumulate with age and stress. Reducing oxidative damage is a general strategy for slowing cellular aging and protecting organ function over time.
• Infections and viral illness: By priming the innate immune system, ABM may help the body respond more quickly to viral and bacterial infections. Some studies show increased production of interferon and other natural antiviral compounds following ABM supplementation.

What can Agaricus blazei Murill help prevent?

• Decline in immune function during chemotherapy
• Blood sugar spikes in people with insulin resistance

Which foods are rich in Agaricus blazei Murill?

1. Agaricus blazei Murill mushroom (whole, dried): The mushroom itself is the only direct source — dried or fresh whole mushrooms can be eaten as a food, steeped as a tea, or used in cooking, as is traditional in Brazil.

Practical Tips:

While ABM is the sole direct source, a diet rich in other beta-glucan-containing foods supports similar immune and metabolic pathways. Oats, barley, shiitake mushrooms, maitake mushrooms, and reishi all provide beta-glucans. Dark leafy greens and colorful vegetables supply the antioxidant support that complements ABM's protective effects. For liver health (one of ABM's key uses), cruciferous vegetables like broccoli and brussels sprouts are especially supportive.

What are the side effects of Agaricus blazei Murill?

• Mild nausea or stomach discomfort, especially at higher doses
• Diarrhea or loose stools in sensitive individuals
• Rare elevation of liver enzymes (ALT/AST) at high doses: liver function monitoring recommended with prolonged high-dose use
• Potential allergic reaction in people with mushroom allergies
• Possible low blood sugar when combined with diabetic medications
• Eosinophilia (elevated eosinophil count) has been reported in rare cases

Good to know:

ABM is well-tolerated at standard doses for most adults. The most meaningful safety consideration is agaritine content in raw mushroom — this decreases substantially with drying, cooking, or hot water extraction, which is why extracts are generally preferred over raw mushroom powder.

How much Agaricus blazei Murill should you take?

• Recommended daily: 1,000–3,000 mg/day of dried extract (standardized to beta-glucan content); up to 6,000 mg/day used in some clinical oncology adjunct studies
• Best time of day: Divided doses work best — take with morning and evening meals to maintain consistent polysaccharide levels throughout the day
• With or without food: Take with food to improve tolerability and enhance absorption of fat-soluble compounds like ergosterol
• Time to effect: Immune markers may improve within 2–4 weeks; blood sugar and anti-inflammatory benefits typically require 4–8 weeks of consistent use
• How long to take it: Can be used long-term as a daily supplement; no formal cycling required, though periodic breaks (e.g., one month off every three to four months) are a common practice in Japanese integrative oncology protocols