Gastrodia Tuber powder(Latin:Gastrodiae Rhizoma). It is used to treat hypertension, improve circulation & resolve headaches. Name: Gastrodiae Rhizoma(Tian Ma) powder, Gastrodia Tuber powderGastrodia Tuber is a traditional Chinese herb, named Tian Ma in Chinese, and is commonly used in China to treat hypertension, improve circulation and resolve headaches. But appears exclusively as an allergy ...