Rhizoma Drynariae. Part used: Rhizome. Known as Boneknit root. Entering meridians: Kidney and Liver. Gu Sui Bu tonifies kidney Yang, strengthens the sinews and bones and benefits the ears, promotes mending of sinews and bones, stimulates hair growth and invigorates the blood. All Phoenix Medical dry authentic herbs and concentrated herbal granules are free of sulphur, herbicides and pesticides.