History
Tangerine Peel
The practice of using citrus peels in traditional Chinese medicine originated from Song Dynasty and has lasted for seven hundred years.
Web MD
https://www.webmd.com/diet/health-benefits-tangerines#1
https://www.esgreen.com/info/about-dried-tangerineor-orange-peel-chen-pi/#:~:text=Tangerine%20peel%E2%80%94called%20Chen%20Pi,use%20in%20traditional%20Chinese%20medicine.&text=It%20is%20said%20to%20settle,and%20to%20break%20up%20congestion.
https://www.thespruceeats.com/dried-tangerine-peel-information-694712
potentially may cleans soil of heavy metals
https://www.researchgate.net/publication/319899059_Study_on_potential_bio-adsorption_of_Tangerine_peel_in_removal_of_heavy_metals_Pb_Cd_and_Ni_of_vegetable_coriander