Herba Epimedii. Part used: Leaf. Known as Horny Goat Weed Leaf. Entering meridians: Kidney and Liver. Yin Yang Huo tonifies the kidneys, strengthens Yang, increases the libido, dispels wind-cold-dampness and warms and unblocks the flow of Yang Qi. All Phoenix Medical dry authentic herbs and concentrated herbal granules are free of sulphur, herbicides and pesticides.