Lichens have no special properties as a food, but are rich in nutrients such as iron and magnesium. Lichen is a complex of algae and fungi, which is rich in algal nutrients and fungal nutrients. Each 100 grams of lichen contains 1.8 grams of carbohydrates, 1.5 grams of protein, vitamin A37IU, iron 21.1 milligrams, calcium 14 milligrams, potassium 102 milligrams, magnesium 275 milligrams. Among them, iron and magnesium content is extremely rich, is a high-quality source of iron and magnesium elements in food. Appropriate consumption of lichen is beneficial to human health, but any food is not recommended to eat more than one, while trying to eat with other foods, so as to ensure the diversity of food, is conducive to balanced nutrition, and is beneficial to health.