Hua Jiao or Chuan Jiao (Pericarpium Zanthoxyli)
Properties: acrid, hot, slightly toxic
Channels: Kidneys, Spleen, Stomach
Key Characteristics: Warms the middle, disperses cold, stops pain from cold, kills parasites (especially roundworms), tonifies Mingmen fire. Also good externally as part of a wash for vaginal itching (usually together with Ai Ye, Huang Bai, She Chuang Zi, Bai Xian Pi, and Ku Shen).
Additional Notes: Do not use internally during pregnancy.