1. Lemon: Lemon is one of the most common fruits rich in citric acid.

2. Grapefruit: Grapefruit is also one of the fruits with more citric acid.

3. Oranges: Oranges are one of the fruits with the highest citric acid content in citrus.

4. Jujube: Jujube is a fruit rich in citric acid.

5. Berry fruits: Berry fruits such as strawberries, raspberries and blueberries all contain citric acid.

6. Persimmon: For persimmon, it is rich in various organic acids, including citric acid.

7. Tomatoes: Tomatoes are not only rich in folic acid and vitamin C, but also contain a proper amount of citric acid.

In addition, some artificial foods, drinks and cosmetics often contain citric acid.