Carbonized Human Hair Classic Formulas

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Astringes leakage of blood and stops bleeding - used for epistaxis, uterine bleeding, postpartum bleeding, hemoptysis, hematemesis, blood in the stool, and other hemorrhagic presentations where a charcoal that stops bleeding without excessive cloying is desired.
Stops bleeding without strongly retaining stasis - classical sources emphasize that Xue Yu Tan checks hemorrhage yet still works well with stasis-resolving hemostatics when dark or congealed blood is present.
Promotes urination and treats Blood Lin - extended to hematuria and painful urinary bleeding patterns, especially when the bleeding must be restrained while the urinary pathway remains open.
Generates flesh and treats ulcerative lesions externally - powdered Xue Yu Tan is used on sores, wounds, and selected burns after ulceration when the goal is to stop oozing and support tissue recovery.

Hua Xue Dan (化血丹) - late classical formula pairing Xue Yu Tan with Hua Rui Shi and San Qi for coughing blood and related bleeding-with-stasis presentations.
San Hui San (三灰散) - TCM Wiki notes its use with Di Yu and Huai Hua for hematochezia or lower-tract bleeding associated with intestinal fire.
Topical Xue Yu Tan powder - traditional standalone use for gum bleeding, nosebleed, and small external bleeding sites that need quick local astringency.

TCM Wiki describes Xue Yu Tan as bitter, astringent, and neutral, emphasizing that it stops bleeding while helping avoid residual stasis and can be used both internally and externally.
American Dragon places Xue Yu Tan in the hemostatic category, entering the Heart, Liver, Kidney, and sometimes Stomach channels, and specifically adds Blood Lin and flesh-generation to the profile.
Sacred Lotus lists Xue Yu Tan among the stop-bleeding medicinals, while Me & Qi's Hua Rui Shi pairing notes preserve its role as a supplementary blood-supportive hemostatic in Hua Xue Dan.