Oyster mushrooms provide high quality of protein, they are also are rich in fiber, minerals and vitamins, and have low crude fat content, with a high proportion of polyunsaturated fatty acids (72 to 85 %) relative to total content of fatty acids. These properties are major contributing factors to the traditional recognition of mushrooms as "healthy" foods.
Mushroom protein contains all the nine essential amino acids required by man. Mushrooms are a relatively good source of the following individual nutrients: fat, phosphorus, iron, and vitamins including thiamine, riboflavin, ascorbic acid, ergosterine and niacin. They are low in calories, carbohydrates and calcium.