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This is an information page with general information about the raw material reishi. It is not medical advice and is not intended to replace advice from a doctor or other healthcare professional. Always consult a professional for health questions. Kraatje.eu does not offer products on this page; this page is about the mushroom Ganoderma lucidum in general.

Reishi benefits: what research and tradition say

Reishi is one of the few mushrooms that has already been the subject of a lot of scientific research, which explains why interest in “reishi benefits” has grown so much in recent years. On this page we explain factually what reishi (Ganoderma lucidum) is, which compounds it contains, and what researchers are actually studying. We do that without big promises: reishi is not a miracle cure, and good health always starts with a balanced diet, enough sleep and exercise. What makes reishi interesting is the combination of a 2,000-year tradition of use and a growing body of modern research.

What is reishi (Ganoderma lucidum)?

Reishi (Ganoderma lucidum), called Ling Zhi in Chinese, is a glossy, reddish-brown mushroom with a fixed place in traditional Chinese practice going back some 4,000 years. There it is known as the “mushroom of immortality”, a name that says more about the reverence with which the species has been treated over the centuries than about what the mushroom does. Reishi grows naturally on hardwood trees and is today cultivated on solid oak wood, mimicking its natural growing conditions.

What sets reishi apart from ordinary edible mushrooms is its rich composition. The species naturally contains a group of compounds that few other mushrooms carry so prominently, and it is precisely those compounds that are the focus of most research.

The characteristic compounds in reishi

If you search for “reishi benefits”, you quickly land on a handful of compound groups. It helps to know what they are, because research focuses on these compounds, not on the mushroom as a whole:

Triterpenes (including ganoderic acids): these compounds are particularly characteristic of reishi and give the extract its typical bitter taste. They are rare in other mushroom species.
Beta-glucans and polysaccharides: a group of water-soluble compounds found in many functional mushrooms. Beta-glucans are the most-researched bioactive compound group in mushroom extracts.
Amino acids and minerals: reishi also contains various amino acids and minerals such as germanium, selenium and manganese.

The ratio and concentration of these compounds differ greatly per product. A standardised hot water extract with a measured polysaccharide content concentrates these water-soluble compounds, whereas ground powder does not. Read more in our article on extract versus powder.

What does science study around reishi?

This is exactly where we have to be careful. Research into the compounds in reishi is not the same as a proven effect of a reishi product. So we describe what is being studied, not what reishi “does”.

Immune system. For reishi, a health claim relating to immune support has been submitted to the European authority (EFSA). That claim is currently “on hold”: it has been submitted and is still being assessed, but is not yet formally approved. Health claims for botanicals are handled cautiously in the UK, so on our product pages you will see this wording accompanied by a disclaimer. The underlying beta-glucans are studied in scientific research in relation to the immune system, but that research is very much ongoing.

Relaxation and stress. Reishi is studied in the literature as a so-called adaptogen, a term for compounds studied in the context of how the body deals with stress. Research looks among other things at the role of the triterpenes. This is a research direction, not an established effect, and the results are not yet conclusive.

Sleep. Reishi is also the subject of research around sleep. A study presented at the SLEEP 2026 conference looked at reishi extract in adults over an eight-week period. This kind of research is interesting, but it is ongoing scientific work: a single study proves no effect, and cumulative research over time is needed before anything general can be said.

Important: on our product pages you will not find claims about cholesterol, circulation or sleep. These do not fall under the authorised or on-hold wordings we may use, and we deliberately stay within the lines of the law.

Traditional use of reishi

Separate from the modern research, reishi has a long, well-documented tradition of use. In traditional Chinese practice the mushroom has long been regarded as a general tonic, and in classical texts it is associated with long life and vitality. Reishi was traditionally prepared as a decoction or tea, which is in fact an early form of hot water extraction, exactly the method modern extracts use too.

This tradition is descriptive: it tells how people have used and valued reishi through history. It is not proof of a health effect, but it does explain why reishi remains one of the most valued functional mushrooms in Asia.

Do not see it as a miracle cure

Reishi can be an interesting addition for anyone interested in functional mushrooms and the tradition behind them. But do not see it as a miracle cure, and do not expect acute effects. The compounds in reishi are still being researched extensively, and much of what you read online about “reishi benefits” runs ahead of research that is not yet finished.