The first type of food for folic acid supplementation is animal offal, especially liver, such as pig liver, chicken liver and lamb liver, which are often rich in folic acid and provide the body with many sources of folic acid. The second food group is eggs, such as eggs, duck eggs, quail eggs, these egg foods can also provide the body with a rich source of folic acid. The third food group is green leafy vegetables, such as spinach, celery, leek, cabbage, these green leafy vegetables are very rich in folic acid. The fourth food group is the nut food, such as hazelnuts, peanuts, walnuts, pistachios.