Shiitake Extract
Commonly used for
ImmunityHealthy Aging
Where to Buy
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The cheapest product is usually low quality, but more expensive doesn’t always mean better.
What is it? / Overview
Shiitake mushrooms contain beta-glucans and lentinan, compounds that may stimulate innate immune function. Laboratory and animal studies are promising, but human clinical evidence remains limited with most studies showing modest improvements in immune biomarkers rather than clinical outcomes.
How is it used? / Administration
Form: Fruiting body extract standardized for beta-glucans (lentinan-containing extracts preferred)
Typical dose studied: 500–2,000 mg/day
Timing: With meals
Evidence primarily for immune biomarker improvements rather than disease prevention. Fruiting body extracts generally contain higher beta-glucan concentrations than mycelium products.
How well does it work? / Evidence
? Emerging / limited evidence
Who should avoid it?
Avoid with: Food Allergies; Organ transplant (on immunosuppression)
Interacts with: Immunosuppressants; Anticoagulants — theoretical caution
Already taking it? Use standardized extracts from reputable manufacturers.
Research & references
Dai X et al. (2015). Daily shiitake consumption and human immunity RCT. Journal of the American College of Nutrition. Venturella G et al. (2021). Medicinal mushrooms review. International Journal of Molecular Sciences. Panda SK, Luyten W. (2022). Medicinal mushrooms clinical perspective review. Drug Discovery Today.
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