Pure L-ergothioneine produced through fermentation. Golden oyster mushrooms, apart from containing beneficial beta-glucans, contain some of the highest amounts of ergothioneine. Includes Certified Organic mushrooms. Gluten-Free, Non-GMO, and Vegan. No added starch, mycelium, or grain of any kind. 500mg pills, 60 capsules, 60 servings. Verified for quality at accredited 3rd party labs. Made in an NSF certified facility in the USA.