Of all the mushrooms in our rotation, King Oysters carry the highest concentration of ergothioneine — the rare antioxidant amino acid that some researchers are studying as a longevity-associated compound. Beta-glucan content is on par with other oysters. The big-picture story: nutrient-dense, low-calorie plant food that lives well at the everyday-staple end of the eating spectrum.

These statements have not been evaluated by the FDA. MotorSpores mushrooms are food, not medicine. They're not intended to diagnose, treat, cure, or prevent any disease. Always consult a healthcare professional for medical concerns.

King Oyster stems are the thickest of any oyster — chef-coveted because sliced thick across the grain they cook into something remarkably close to a sea scallop. The caps stay mild and meaty. The whole mushroom is best at high heat in butter or oil; they hold their shape and pick up a beautiful brown crust.

See the signature recipe →

King Oyster runs roughly 21 days from inoculation to harvest. Once cut, it's race-day fresh. Delivered or available for pickup within 48 hours.

The inventory feed is live from TurboBatch, our propietaty mushroom farm management application. The timer above shows the next expected harvest based on what's currently colonizing.

Home delivery: within 35 miles of Gurnee, IL (ZIP 60031). Free over $40, $5 otherwise.

Market pickup: grab your order from us at the farmers market. Free. See the Markets page for upcoming dates.

Outside the delivery zone? Fresh mushrooms only ship locally, but our extracts & powders ship anywhere in the US.