Tangerine peel by Ray Sahelian, M.D.
March 12 2016

I once took a class in Chinese herbology and i remember the teacher mentioning tangerine peel being used in Chinese medicine.

Tangerine peel and cancer
Human cancer cells contain an enzyme called P450 CYP1B1. Researchers at Leicester School of Pharmacy claim this enzyme is destroyed by a compound contained in tangerine peel, salvestrol Q40. Medicinal chemist Dr. Hoon L. Tan
hopes tangerine peel extract may offer potential help in the treatment of breast, lung, prostate and ovarian cancers. He adds, "Salvestrols may offer a new mechanism of dietary anti-cancer action." The researchers have formed a private company called Nature's Defence Investments to promote their research.

Eating peels
In the past, people used to eat tangerine peel and got the benefits of salvestrols. But hardly anyone eats the skin of fruits.

CNS Neurol Disord Drug Targets. 2013. Citrus Peel Extract Attenuates Acute Cyanide Poisoning-Induced Seizures and Oxidative Stress in Rats.

Food Chem Toxicol. 2014. Hesperidin, nobiletin, and tangeretin are collectively responsible for the anti-neuroinflammatory capacity of tangerine peel (Citri reticulatae pericarpium). Inhibiting microglial activation-mediated neuroinflammation has become a convincing target for the development of functional foods to treat neurodegenerative diseases. Tangerine peel (Citri reticulatae pericarpium) has potent anti-inflammatory capacity; however, its anti-neuroinflammatory capacity and the corresponding active compounds remain unclear. Overall, tangerine peel possesses potent anti-neuroinflammatory capacity, which is attributed to the collective effect of hesperidin, nobiletin, and tangeretin.