"The sweet warmth of Epimedii Herba (yin yang huo) tonifies the fire at the gate of vitality and fortifies the Kidney yang, while its acrid warmth expels wind-dampness. Tonification of of the Kidney yang enables it to treat impotence, spermatorrhea, and urinary frequency. Internally, reinforcement of the Kidney yang strengthens the bones, while externally, wind-dampness is dispersed so that painful obstruction is unblocked. Thus, only only are these pathogens expelled, but the injury done by them is repaired."