Body: People who study "Pharmacognos" investigate medicinal drugs obtained from plants or other natural sources.
Some subfields in "Pharmacognos" include history, chemistry, and side effects.
Understanding the role natural plant derivatives play in historical and modern medicine is some of the cause to investigate "Pharmacognos".
Professionals of "Pharmacognos" include J Bruneton, Edward Claus, and Shoji Shibata.