Oyster mushroom is a popular and delicious edible mushroom, It contains Vc, and microelements such as P, K , Te, Zn, Cu, Co. Mo, and abundant amino acids --especially glutamic acid. Besides being eaten, it can be used to ease the body, decrease cholesterin, lower blood pressure, guard against arteriosclerosis and against tumors. Its fruitbody extract has 75.3% efficiency against sarcoma -180