Himalayan Teasel Root Classic Formulas … Natural Herb Library

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Tonifies the Liver and Kidney and strengthens tendons and bones - Xu Duan is a foundational herb for lumbar soreness, weak knees, frail structure, and chronic deficiency affecting musculoskeletal stability.
Calms the fetus and secures pregnancy - it is one of the better-known herbs for threatened miscarriage with sore back, weak lower burner support, or deficiency-related uterine instability.
Activates the blood while helping repair what is damaged - traditional use includes traumatic injury, fracture, tendon damage, and pain after falls or overstrain.

Shou Tai Wan - classic use of Xu Duan with Sang Ji Sheng, Tu Si Zi, and E Jiao for threatened miscarriage from deficiency.
Tai Shan Pan Shi San and related pregnancy-support formulas - examples of Xu Duan in formulas that stabilize and nourish while protecting the fetus.
San Bi Tang and other sinew-bone formulas - broader use when chronic weakness, painful obstruction, and deficient structure overlap.

Official Chinese herb references describe Xu Duan as bitter, sweet, acrid, and slightly warm, entering the Liver and Kidney to tonify, reconnect sinews and bones, and move the blood network.
Classical texts consistently emphasize back and knee weakness, miscarriage risk, uterine bleeding, traumatic injury, and fractures as its signature terrain.
Compared with some stronger hot Kidney tonics, Xu Duan is valued because it supplements without being excessively harsh and also keeps a repair-oriented blood-moving dimension.