Vitex Trifolia is naturally found along coastlines from tropical East Africa as far as Frecnh Polynesia.The seeds of this tree, also called Simpleleaf Chastree are renowned for their benefits on their eyes.

According to TCM, Man jing zi is recommended to scatter the Wind and clarify the Heat, because these elements are responsible for different discomforts of the eyes (red, painful, swollen, dry eyes, etc.) but also they may cause headaches. Man jing zi soothes eyes irritations and reduces eye strain to ensure an optimal eye comfort.