Niu Xi Root Classic Formulas … Natural Herb Library

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Invigorates Blood and dispels stasis ... Niu Xi is used for fixed pain, amenorrhea, traumatic bruising, and chronic obstruction patterns in the lower body.
Guides Blood and rising heat downward ... it is chosen when headache, dizziness, or hypertension-type patterns benefit from a descending root that also moves stasis.
Strengthens sinews and bones ... lower-back soreness, weak knees, and chronic Bi syndrome remain central reasons the herb is used.
Promotes urination and frees damp obstruction in the lower burner ... traditional use extends to strangury and swelling when stasis and dampness coexist.

Zhen Gan Xi Feng Tang ... classical downward-guiding use when Liver Yang rises with headache and dizziness.
Du Huo Ji Sheng Tang lineage ... traditional lower-back, knee, and Bi syndrome formulas relying on Niu Xi to strengthen the lower body while moving obstruction.
Blood-stasis and gynecologic formulas with Tao Ren, Hong Hua, or Dang Gui ... used when menstrual blockage and pain are prominent.

Traditional herbology consistently places Niu Xi among herbs that both move Blood and guide fire or Blood downward.
Later trade distinctions emphasize root form and source ... Huai Niu Xi, ordinary Niu Xi, and Chuan Niu Xi overlap but should not be flattened into one undifferentiated page.