Oyster mushrooms are low in calories and fat, while being a good source of protein, fiber, vitamins, and minerals. They are particularly rich in B-vitamins, such as niacin, riboflavin, and pantothenic acid, as well as potassium, phosphorus, and zinc. Oyster mushrooms are also known for their potential health benefits, as they contain bioactive compounds that have antioxidant, anti-inflammatory, and immune-boosting properties.