Mandarines

Chen Pi is a sun-dried mandarine peel that has been used in traditional Chinese medicine for centuries.

An excerpt from the article 15 facts about mandarines
The history of Chen Pi dates back to the Song Dynasty (960 - 1279). The dried mandarine peel contains about 140 health-promoting compounds in its composition. According to traditional Chinese medicine, Chen Pi improves spleen function, reduces bloating, aids digestion and regulates the circulatory system.