The nutritional value of shiitake mushrooms is relatively high. Mushrooms are solitary, clustered or clustered. Fresh and high-quality mushrooms are round and full as a whole, and the mushroom cover is generally very thick, so there will be no dryness. It's big and light, it's elastic to pinch and won't come out. Mushrooms are rich in selenium, which is an important nutrient for human body and an important component of glutathione peroxidase.