A Detailed Guide to the Benefits, Effects, and Precautions of Gu Sui Bu (Davallia fortunei)

Gu Sui Bu is a traditional Chinese medicinal herb derived from the dried rhizomes of ferns such as Davallia mariesii, named for its ability to heal wounds and mend bones, and is also commonly known among the people as Hou Jiang, Mao Jiang, or Pa Yan Jiang. It mostly grows on rocks or old tree trunks in mountain forests and is mainly produced in southern China. The medicinal part is the hairy rhizome, which generally needs to have its fuzz removed and be sliced before use.

From the perspective of traditional Chinese medicine, Gu Sui Bu is warm in nature and bitter in taste, and enters the Liver and Kidney meridians. Its main effects are tonifying the kidney and strengthening the bones, and mending injuries and relieving pain. It is often used for soreness and aching of the lower back and knees, tinnitus and deafness, and loose teeth caused by kidney deficiency, as well as for swelling and pain caused by bruises, strains, and tendon and bone injuries, making it a commonly used herb in orthopedics and traumatology. In addition, external use of Gu Sui Bu is also often associated with hair problems such as alopecia areata and is used in some traditional external formulas.

In practical application, Gu Sui Bu is mostly decocted and taken together with other herbs that tonify the liver and kidney and strengthen tendons and bones, and can also be processed into pills, powders, or medicinal wines. For external use, the herb can be ground into powder and applied as a paste, or decocted in water for external washing or gargling. The specific method of use should follow a doctor's advice. Modern research on Gu Sui Bu mostly focuses on its components related to bone health, and for daily use it is still recommended to proceed under the guidance of a doctor or pharmacist to ensure medication safety.

It should be noted that Gu Sui Bu is warm in nature, so people with yin deficiency and hyperactive fire or signs of internal heat should generally use it with caution to avoid worsening discomfort. During use, one should not increase the dosage on one's own or use it continuously over the long term. If discomfort occurs, use should be stopped promptly and a physician consulted. Pregnant women and those with chronic diseases should first undergo professional evaluation before taking the medication, as only by using it based on pattern differentiation can it exert its proper effects.