Quick Navigation

King Oyster

King Oyster (Pleurotus eryngii) is a dietary mushroom that contains an assortment of bioactive molecules. Oyster mushrooms in general tend to be more popular than other Bioactive Mushrooms due to their taste and usage in meals.

Our evidence-based analysis on king oyster features 24 unique references to scientific papers.

Research analysis led by .
Reviewed by
Examine.com Team
Last Updated:

Summary of King Oyster

Primary Information, Benefits, Effects, and Important Facts

King Oyster mushrooms are a species of the Pleurotus family of mushrooms, and related to regular Oyster mushrooms. They have a large stem that confers a relatively 'meaty' or 'hearty' flavor (Umami) and are seen as a medicinal mushroom.

Not too many studies are conducted on King Oyster mushrooms, but they appear to have the same properties of regular bioactive mushrooms in the sense that they interact with the immune system and may 'boost' immunity to sickness. King Oysters seem to be more potent at suppressing fatty acid absorption relative to other mushrooms according to one study, and have been implicated in increasing testosterone 5-fold. This latter study was conducted with very high doses (15-20% of feed) and was conducted in elk (out of all research animals, elk) and has not been replicated.

It also appears to be more estrogenic and bone protective in animal forms of menopause than other medicinal mushrooms tested.

Get unbiased information on what works

At Examine.com, we pride ourselves on basing all our recommendations on evidence. It’s why we don’t sell any advertising or supplements — so that you know that our analysis is unbiased.

If you’re tired of wasting time and money on supplements that don’t work, our 17 Supplement Guides will help you figure out precisely what to take — and what to skip — based on your health goals and the latest scientific evidence.

Join over 50,000 people who rely on Examine.com's unbiased and science-based analysis.


I want unbiased recommendations »

How to Take

Medical Disclaimer

Recommended dosage, active amounts, other details

At this moment in time, all that can be recommended is to consume the fruiting body or stem of the King Oyster mushroom in your diet if you want the effects. Supplementation would work fine (and if we take motifs from other Bioactive Mushrooms would be around 1-3g daily) but minimal human studies have been conducted.

Things to Note

Also Known As

Pleurotus eryngii, Eringi, King Brown

Caution Notice

  • Some people may suffer allergic reactions to King Oyster mushrooms, and this would affect both supplementation as well as food. Do not use King Oyster Supplements if you have a known mushroom allergy

  • Some people may suffer allergic reactions to King Oyster mushrooms, and this would affect both supplementation as well as food. Do not use King Oyster Supplements if you have a known mushroom allergy

Tired of misinformation? Get unbiased info on supplements.

At Examine.com, our incentives line up with yours — getting unbiased information. It’s why we don’t sell any advertising or supplements.

Join over 250,000 people who’ve learned about effective versus overrated supplements, supplement buying tips, and how to combine supplements for safety and efficacy.

Click here to see all 24 references.