Oyster mushroom

Oyster mushroom

Common Names

  • Brown oyster mushroom
  • Hao gu

For Patients & Caregivers

Oyster mushroom has not been shown to treat cancer in humans.

Oyster mushroom is an edible fungus. It is used in traditional medicine to treat infections, diabetes, cancer, and to lower cholesterol. Laboratory experiments and studies done in mice have shown that oyster mushrooms have antitumor, antifungal, and cholesterol-lowering properties. A study done in children with upper respiratory tract infections showed that oyster mushroom has anti-allergic effects. It was also shown to lower glucose levels and increase insulin levels in patients with type 2 diabetes, but more studies are needed to confirm such effects.

  • Antitumor
    Oyster mushrooms increased survival in tumor-bearing mice but no such studies have been done in humans.
  • Antifungal
    One laboratory study showed that oyster mushroom has antifungal activity.
  • High fat levels in the blood
    Studies done in mice suggest that oyster mushroom lowers the level of fats or lipids in the blood. However, a clinical trial did not find such benefits in HIV patients who had high cholesterol levels caused by antiretroviral treatment.
  • Diabetes
    Studies in mice and humans suggest that oyster mushroom may lower blood sugar levels and increase insulin levels. More studies are needed to confirm these effects.
  • You are allergic to mushrooms.

Case reports

  • Occupational asthma, widespread lung inflammation: Following exposure to oyster mushroom spores.
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For Healthcare Professionals

Pleurotus ostreatus

Oyster mushroom is an edible fungus found widely in North America and Europe. It is used in traditional medicine to treat infections, hyperlipidemia, diabetes, and cancer.

In vitro experiments and studies done in mice have shown that oyster mushroom has antitumor (1) (7) (8) (9) (12) (13), immunomodulatory (10) (11), antifungal (2), lipid-lowering, and hypoglycemic (3) (6) properties. Beneficial effects are due to constituents such as polysaccharides, lectins, and peptides.

In a study of HIV patients with antiretroviral treatment-induced hypercholesterolemia, oyster mushroom was not effective in lowering non-HDL cholesterol (5). However pleuran, a beta-glucan isolated from oyster mushroom, demonstrated anti-allergic effects in children with respiratory tract infections (17). In type 2 diabetic patients, an oyster mushroom preparation reduced postprandial serum glucose levels and increased serum insulin levels (19).

Oyster mushroom is an edible fungus, available both in fresh and dried forms. The whole mushroom is often used in soups and sauces.

  • Cancer treatment
  • Diabetes
  • Hyperlipidemia
  • Infections

Pleurostrin, a peptide derived from the fruiting bodies of oyster mushroom, exhibited antifungal properties (2). Mevinolin, another compound, decreased cholesterol biosynthesis by inhibiting HMG CoA reductase, which is the rate-limiting enzyme in cholesterol biosynthesis (3). Ostreolysin, a cytolytic protein isolated from oyster mushroom, caused bradycardia, myocardial ischemia and ventricular extrasystoles following intravenous injection in mice (14). Suggested hypoglycemic mechanisms include increased glucokinase activity and insulin secretion, which increases glucose utilization by peripheral tissues, inhibits glycogen synthase kinase, and promotes glycogen synthesis (19).

A lectin isolated from the fruiting bodies of oyster mushroom demonstrated antitumor activity in mice bearing sarcoma and hepatoma (1). Another study found that the development of precancerous aberrant crypt foci (ACF) was significantly reduced in mice that were fed a diet containing 10% pleuran, a beta-glucan isolated from oyster mushroom (4). RNase Po1, a guanylic acid-specific ribonuclease (a RNase T1 family RNase) from oyster mushroom has been shown to induce apoptosis in tumor cells (18).

Hypersensitivity to oyster mushrooms.

Case reports

  • Occupational asthma and allergic alveolitis: Following exposure to oyster mushroom spores  (15) (16).
  1. Chu KT, Xia L, Ng TB. Pleurostrin, an antifungal peptide from the oyster mushroom. Peptides 2005 Jul;66(1):1-8.

  2. Hossain S, et al. Dietary mushroom (Pleurotus ostreatus) ameliorates atherogenic lipid in hypercholesterolaemic rats. Clin Exp Pharmacol Physiol 2003; 30(7):470-475.

  3. Abrams DI, Couey P, Shade SB, et al. Antihyperlipidemic effects of Pleurotus ostreatus (oyster mushrooms) in HIV-infected individuals taking antiretroviral therapy. BMC Complement Altern Med. 2011 Aug 10;11:60.

  4. Wasonga CG, Okoth SA, Mukuria JC, Omwandho CO. Mushroom polysaccharide extracts delay progression of carcinogenesis in mice. J Exp Ther Oncol. 2008;7(2):147-52.

  5. Shlyakhovenko V, Kosak V, Olishevsky S. Application of DNA from mushroom Pleurotus ostreatus for cancer biotherapy: a pilot study. Exp Oncol. 2006 Jun;28(2):132-5.

  6. Sarangi I, Ghosh D, Bhutia SK, et al. Anti-tumor and immunomodulating effects of Pleurotus ostreatus mycelia-derived proteoglycans. Int Immunopharmacol. 2006 Aug;6(8):1287-97.

  7. Jedinak A, Dudhgaonkar S, Jiang J, Sandusky G, Sliva D. Pleurotus ostreatus inhibits colitis-related colon carcinogenesis in mice. Int J Mol Med. 2010 Nov;26(5):643-50.

  8. Zuzek MC, Macek P, Sepciæ K, Cestnik V, Frangez R. Toxic and lethal effects of ostreolysin, a cytolytic protein from edible oyster mushroom (Pleurotus ostreatus), in rodents. Toxicon. 2006 Sep 1;48(3):264-71.

  9. Vereda A, Quirce S, Fernández-Nieto M, Bartolomé B, Sastre J. Occupational asthma due to spores of Pleurotus ostreatus. Allergy. 2007 Feb;62(2):211-2.

  10. Mori S, Nakagawa-Yoshida K, Tsuchihashi H, et al. Mushroom worker’s lung resulting from indoor cultivation of Pleurotus ostreatus. Occup Med (Lond). 1998 Oct;48(7):465-8.

  11. Kobayashi H, Motoyoshi N, Itagaki T, et al. The inhibition of human tumor cell proliferation by RNase Pol, a member of the RNase T1 family, from Pleurotus ostreatus. Biosci Biotechnol Biochem. 2013;77(7):1486-91.

  12. Jesenak M, Hrubisko M, Majtan J, Rennerova Z, Banovcin P. Anti-allergic effect of pleuran (β-glucan from Pleurotus ostreatus) in children with recurrent respiratory tract infections. Phytother Res. 2014 Mar;28(3):471-4.

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