Flat mushrooms contain oxalic acid at 0.02mmol/100g, which is a medium level of oxalic acid. Oxalic acid is commonly found in vegetables, and generally speaking, vegetables with astringent flavor have high oxalic acid content. As a vegetable, flat mushroom also contains a certain amount of oxalic acid, with a content of 0.02 mmol of oxalic acid per 100 grams, which is not a very high content of oxalic acid. Flat mushroom is a common food containing vitamins and minerals and other nutrients, which can be used as a source of vitamins and minerals to provide the body with certain nutrients and replenish the body with nutrients. It should be noted that oxalic acid has a certain antagonistic effect on the absorption of minerals, so we can blanch the mushrooms to remove some of the oxalic acid. In addition, it should be noted that the mushrooms should not be ingested in excess to avoid indigestion and other symptoms, such as bloating, abdominal pain, and so on. It is recommended to consume mushrooms together with poultry, meat, eggs, milk and fruits to achieve a variety of food and balanced nutrition.