Eden Apothecary · Herb Profile
Lentinula edodes
Pronounced shih-TAH-kee (shee-TAH-kay); Lentinula edodes: len-TIN-yoo-luh eh-DOH-deez
Neutral, sweet, nourishing immune-nutritive fungus: the deep food-tonic that rebuilds depleted defensive Qi, feeds the convalescent, and schools the immune system through its beta-glucans.
Culinary and food amounts are considered safe and have a long dietary history; a controlled animal reproductive-toxicity study found no adverse effect on maternal reproductive performance or embryofetal development (Nagao et al., Int J Med Mushrooms, PMID 33389872). Human data on concentrated extracts and purified lentinan in pregnancy are lacking, so limit to cooked food amounts and avoid therapeutic extract doses. (AHPA Botanical Safety Handbook 2nd ed.; Natural Medicines.)
Cooked food amounts are considered safe and traditionally consumed during lactation. No specific safety data exist for concentrated extracts or purified lentinan while breastfeeding; keep to culinary amounts. (AHPA Botanical Safety Handbook 2nd ed.; Natural Medicines.)
Cooked culinary amounts are safe and nutritious for children (a dietary source of vitamin D2, B-vitamins, copper and selenium). Reserve concentrated immune extracts for older children under practitioner guidance. Always serve thoroughly cooked, since raw or undercooked shiitake can provoke flagellate dermatitis.
Always cook thoroughly. Raw or lightly cooked shiitake, and high-dose raw powder, can cause shiitake flagellate dermatitis, a self-limiting whip-like (linear, cross-hatched) rash driven by the thermolabile polysaccharide lentinan, plus nausea and GI upset. Concentrated immune extracts stimulate macrophages and NK cells: caution in autoimmune disease and with immunosuppressant therapy. Occupational spore inhalation among growers can cause respiratory hypersensitivity (mushroom worker's lung). Rare allergy and eosinophilia with sustained high-dose extracts.
No absolute contraindications at culinary (thoroughly cooked) food amounts. Relative contraindications for concentrated extracts: autoimmune disease, organ-transplant immunosuppression, and known mushroom allergy. Avoid raw or undercooked consumption.
Not at risk. Shiitake is one of the most widely cultivated edible-medicinal mushrooms in the world, grown sustainably on hardwood logs and on sawdust blocks; there is no wild-harvest conservation concern. Prefer organic, log-grown (rather than sawdust-block) shiitake for potency and flavor, and source from growers who use untreated hardwood.
Not named in the canonical biblical texts. Native to the mountain forests of East Asia (China, Japan, Korea), where it has been cultivated on shii and oak logs since roughly the Song dynasty (about 1000-1200 CE). Documented as a medicinal food, Xiang Xun / Xiang Gu, in Li Shizhen's Ben Cao Gang Mu (1596). The Japanese name shii-take means 'shii-tree mushroom.'
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