Know2eat

Oyster mushrooms

Pleurotus ostreatus

What oyster mushrooms has been studied for

2 associations assessed — 2 with at least some human evidence behind them. Strongest first.

  • 2 Limited
3 things to know first — allergies, interactions and intake limits

About oyster mushrooms

A fan-shaped wood-decomposing mushroom grown on straw and sawdust, one of the easiest species to cultivate. The flesh is thin, tender and faintly aniseed-scented.

Also known as Pleurotus, Hiratake, Tree oyster, Pearl oyster mushroom

Blood Sugar & Metabolic HealthHeart Health

The evidence in depth

Best supported: Limited

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how impressive the food is. How we rate evidence.

Blood glucose response

Blood Sugar & Metabolic Health
Limited evidence

Small trials in people with type 2 diabetes report lower fasting glucose after several weeks of oyster mushroom powder. The studies are few, small and mostly from one region, which is not enough to establish the effect.

Limited evidence. Early human work, or mostly lab and animal research.

3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Blood lipid profile

Heart Health
Limited evidence

Oyster mushrooms naturally contain lovastatin, the same molecule as the prescription statin, and a few small trials report modest reductions in total and LDL cholesterol. The amounts present are far below a therapeutic dose, the trials are small, and this should not be read as a substitute for anything.

What may be going on: Lovastatin inhibits HMG-CoA reductase, the rate-limiting enzyme of cholesterol synthesis. Fungal beta-glucans may also bind bile acids.

Limited evidence. Early human work, or mostly lab and animal research.

1 source

Deep research mode adds each paper’s own conclusion and stated limitations.

Ask about Oyster mushrooms

Ask about Oyster mushrooms

Answers are written only from the entries on this page — the same nutrients, compounds, claims and citations you can read above. Nothing is added from outside the database, and every answer lists what it was built from.

AI explanations are not switched on for this site, so there is nothing to ask here. Everything above is read straight from the database and does not need them.

Key nutrients

Nutrient content per 100 grams
NutrientAmount% DV
Macronutrients
Calories33 kcal2%
Protein3.31 g7%
Total fat0.41 g1%
Carbohydrate6.09 g2%
Fibre2.3 g8%
Total sugars1.11 g—
Water89.2 g—
Fats
Saturated fat0.062 g0%
Monounsaturated fat0.031 g—
Polyunsaturated fat0.123 g—
Cholesterol0 mg0%
EPA (omega-3)0 g—
DHA (omega-3)0 g—
DPA (omega-3)0 g—
Linoleic acid (omega-6)0.123 g—
Vitamins
Vitamin A2 µg0%
Vitamin C0 mg0%
Vitamin D0.7 µg3%
Vitamin E0 mg0%
Vitamin K0 µg0%
Thiamin (B1)0.125 mg10%
Riboflavin (B2)0.349 mg27%
Niacin (B3)4.96 mg31%
Pantothenic acid (B5)1.29 mg26%
Vitamin B60.11 mg6%
Folate38 µg10%
Vitamin B120 µg0%
Choline48.7 mg9%
Minerals
Calcium3 mg0%
Iron1.33 mg7%
Magnesium18 mg4%
Phosphorus120 mg10%
Potassium420 mg9%
Sodium18 mg1%
Zinc0.77 mg7%
Copper0.244 mg27%
Manganese0.113 mg5%
Selenium2.6 µg5%
Other measured compounds
Beta-carotene29 µg—
Alpha-carotene0 µg—
Lycopene0 µg—
Lutein + zeaxanthin0 µg—
Caffeine0 mg—
Ash1.01 g—

Nutrient values are per 100 g of the USDA reference entry named on this page and vary with variety, growing conditions, storage and preparation.

Source record: Mushrooms, oyster, raw (USDA FoodData Central, FDC ID 168580).

% DV uses the FDA Daily Values for adults and children aged 4 and over. A dash means no Daily Value has been established for that nutrient.

Bioactive compounds

Compounds present in meaningful amounts. Presence is banded rather than quantified, because whole-food levels vary enormously with variety, growing conditions, storage and preparation.

How preparation changes things

Only effects with real support are listed. If a preparation method is missing, it is because nothing dependable is documented — not because it makes no difference.

Nothing dependable is recorded about how preparation changes this food’s nutritional properties. Rather than guess, this section stays empty.

Things to know

Allergies, interactions and intake concerns. Every food gets this section — a reference where everything is uniformly good is not a reference.

  • Allergy

    Spore exposure and hypersensitivity pneumonitis

    Oyster mushrooms release very large numbers of spores, and repeated heavy inhalation causes an occupational lung disease known as mushroom worker's lung. This affects growers and harvesters rather than people eating them, but home cultivators should ventilate.

  • Worth knowing

    Wild look-alikes

    The jack-o-lantern mushroom and other gilled species growing on wood are mistaken for oyster mushrooms and cause serious gastrointestinal illness. Never eat a wild mushroom you cannot identify with certainty.

  • Worth knowing

    Best cooked thoroughly

    Fungal cell walls are chitin, which humans digest poorly, and raw mushrooms commonly cause bloating and discomfort. Cooking improves both digestibility and flavour.