葛根 has been a staple of traditional Chinese medicine for over 2,000 years - it is the headliner ingredient in
葛根汤, a classical formula recorded in Zhang Zhongjing's 《
伤寒论》 (c. 200 CE) for stiff necks and early-stage colds. You'll find
葛根 powder, tea, and noodles all over Chinese health-food shops.