Oyster mushrooms contain significant levels of zinc, iron, potassium, calcium, phosphorous niacin, riboflavin, vitamin C, as well as folic acid, vitamin B 1 and B 2. Oyster mushrooms also contain ergothioneine, a unique antioxidant exclusively produced by fungi. There is evidence that oyster mushrooms may improve the filtration rate in the kidneys and help regulate blood pressure.
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