In Europe and America, “mushrooms” in a recipe usually refers to button mushrooms (Agaricus bisporus), which were first cultivated in France in the 1600’s. In Far East Asia, the equivalent is Shiitake, which has long been the cultivated “food mushroom” of choice. Only in the past few decades has Shiitake become a household name in western cuisine.

Known alternately as Black Mushroom or Chinese Mushroom, wild Shiitake grows in Asia only. The name derives from the Shii Tree, its preferred host, although Shiitake may also grow on oaks and beeches. Shiitake has been cultivated in China and Japan for a thousand years.

Although most westerners are now familiar with Shiitake as a food mushroom, few know that it’s also the most researched medicinal mushroom in Asia. As with other medicinal mushrooms, the research has largely focused on applications against cancer, [94] but also on its anti-viral properties. [93]

The preferred part of Shiitake to use medicinally is the mycelium (the “roots”) because they contain compounds that either don’t exist in the fruit body (“mushroom”), or are much more concentrated in the mycelium.

The most common extract is known as LEM, a protein extract from Lentinula Edodes Mycelia. (Lentinula edodes is Latin for Shiitake.) LEM has been shown to have powerful immune boosting properties, [95, 96, 97] particularly anti-bacterial. [98, 99] LEM has also been found to exhibit anti-cancer properties. [100] One study found it to kill melanoma cells while causing no harm to healthy cells. [101]

Another active compound of Shiitake extract that has been much studied is Lentinan; a protein-free polysaccharide, so named after Lentinula, the Latin genus name for Shiitake. Lentinan does not directly kill tumors but has been shown to stimulate the tumor fighting mechanisms in the body of test subjects, [102, 103, 104, 105, 106, 107, 108, 109, 110] and is in fact in use in Asia as an injected cancer medication.

Arabinoxylanes of Shiitake extract derived from rice cultivated mycelium have been shown to have powerful anti-viral properties. [111, 112, 113]

In particular, type 1 herpes simplex virus [114] and HIV [115, 116, 117] have been shown to respond to Shiitake extracts in clinical trials, although one study found that Lentinan by itself – isolated from the other active compounds of Shiitake – had no noticeable effect on HIV replication. [25]

Other studies worth a brief mention have reported positive findings in the use of Shiitake extract to prevent septic shock, [120] and to treat Candida [118] and chronic fatigue syndrome. [119]

Foremost American medicinal mushroom expert Paul Stamets, in his book Mycelium Running, lists several additional areas where research has indicated that Shiitake may be useful: Cholesterol; blood sugar, blood pressure; sexual dysfunction; kidney health; stress; liver support; prostate cancer; liver cancer; breast cancer. [134]

Note: The statements on this page have not been evaluated by the Food and Drug Administration. This article is not intended to diagnose, treat, cure or prevent any disease. Never use any medicinal mushroom or herb without prior approval by medical doctor.

Credit to Paul Stamets for research and source material.