This formula is a modification of Yi Gan San (Repress the Liver Powder) originally found in Yang Shi-ying’s Song dynasty Ren Chai Zhi Zhi Fang (Compassionate & Abstemious Straight Guiding Formulas). The original formula is indicated for excitability, nervousness, and irritability. Modifications are by Bob Flaws. When modified, this formula can also be seen as a version of Xiao Yao San (Rambling Powder). Our version is a 10:1 extract in a glycerin base.