Patent No. 11,904,038 B2 (Tae Sun Park); Industry-Academic Cooperation Foundation, Yonsei University, Seoul, has patented a method for preventing or treating hair loss, or promoting hair development or hair growth that entails administering a composition including α-phellandrene or β-phellandrene or a pharmaceutically acceptable salt thereof as an active ingredient. The patent states that the composition can also be taken orally.

Phellandrene is an essential oil component of various plants, and is mainly contained in plants such as dill (Anethum graveolens L.), Echinophora cinerea, and pepper tree (Schinus molle). Phellandrene is known to be an edible safe substance. According to the patent owners, phellandrene has been approved for use as flavor and fragrance agents by the Flavor and Extract Manufacturers’ Association (FEMA), the Food and Drug Administration (FDA), the Korea Food and Drug Administration (KFDA), the Council of Europe (COE), and the Joint FAO/WHO Expert Committee on Food Additives (JECFA), and has been used industrially for the purpose of producing flavor and fragrance.