Written by Dr. James Meschino, D.C., M.S.,
– Research and Clinical Director, RenaiSanté Institute of Integrative Medicine –

Recent And Historical Use Of Reishi Mushroom Extract
Reishi mushroom (Ganoderma lucidum) is called “the mushroom of immortality” in China and has been used in Oriental Medicine for over 2,000 years. ^(1,2) In recent years its active ingredients have been the subject of intensive research regarding their apparent ability to help prevent or treat certain types of cancer, aid in the treatment of liver disease, HIV infection, acute or recurrent herpetic infections, high blood pressure, chronic bronchitis, allergies and asthma, and favorably modulate immune function. ⁽³⁾ The reishi mushroom grows wild on decaying logs and tree stumps in the coastal provinces of China. The fruiting body of the mushroom is used medicinally. ⁽⁴⁾

Active Constituents: Reishi mushrooms contain a number of active agents that are known to modulate function of the immune system in humans. The primary agents include:

1. Specific Polysaccharides - which occur in the form of Beta-D-glucans bound to amino acids. These agents are known to possess immune-modulating and anti-cancer properties. (3)
2. Triterpene compounds - known as ganoderic acids, which have been shown to lower blood pressure, reduce platelet stickiness and may decrease LDL-cholesterol. (5)
3. Other major active constituents - including sterols, coumarin and mannitol. (5)

Clinical Application and Mechanism of Action

1. Anti-Cancer Agent: Cancer studies in animals have shown a 50% tumor regression rate with reishi mushroom extract treatment (e.g., connective tissue cancer model in mice). ⁽⁶⁾ Reishi mushroom extract is used by some cancer surgeons in Japan to treat cancer patients and significant anti-tumor and immunostimulation effects have been noted in many of these cases. ⁽⁷⁾ Polysaccharides from reishi mushrooms and from other types of folk-medicinal fungi are patented in Japan for use as immunomodulators in the treatment of cancer. They are combined with chemo- and radiotherapy and have demonstrated an ability to reduce side effects, increase the efficacy of treatments, and are used to accelerate recovery from disease. ^(8,9)
   Studies from China have shown that reishi mushroom extract potentiates the tumoricidal capacity of macrophages and T-cells. ^(10,11) Reishi mushroom extract is known to have other immune modulating effects and antioxidant properties as well. ^{(12,13,14,15,16)}
2. Immune System Enhancement: (Bronchitis, Asthma, Allergies, Herpetic Conditions and HIV Infection) As noted above, reishi mushroom extract modulates many components of the immune system, which in part, account for its apparent anti-tumor properties. Chronic bronchitis in the elderly has been shown to respond favorably to treatment using a concentrated reishi mushroom product in a trial involving 2,000 cases in China. This study demonstrated a better than 60% success rate. After several months of treatment there was a noted rise in the levels of immunoglobulin A in the sputum. ⁽¹⁰
   The combination of astragalus and reishi mushroom extract represents an effective means of daily immune support and a therapeutic intervention for a large number of immune compromised states (e.g.,chronic fatigue, chronic bronchitis, herpes I and II recurrent infections, post-herpetic neuralgia, recurrent apthous ulcers or canker sores, the common cold, HIV infection, etc.) and for patients undergoing chemo-or radiation therapy.
3. Cardiovascular Health: (High Blood Pressure and Reduced Platelet Aggregation) Two human controlled studies revealed that reishi mushroom extract can reduce high blood pressure to a significant degree (systolic and diastolic), even in patients who had previously failed to respond to established anti-hypertensive medications. ^(30,31) Animal studies reveal that reishi mushroom extract reduces blood pressure through a central inhibition of sympathetic nerve activity, although it does not slow heart rate or induce a sedative effect in general. ⁽³²
4. Liver Protective Effects: (Hepatoprotective Properties) Reishi is prescribed in China for the treatment of chronic and acute hepatitis. ⁽³⁶⁾ Various ganoderic acids in reishi mushrooms have strong antihepatotoxic properties, ⁽³⁷⁾ which under experimental conditions have been shown to protect liver cells from chemically-induced injury, including protection from the highly toxic and lethal substance, carbon tetrachloride. ^(38,39)