Padauk Heartwood Classic Formulas … Natural Herb Library

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Dispels blood stasis and relieves pain ... Zi Tan is traditionally used for headache, heart-abdominal pain, traumatic injury, and lingering blood stasis discomfort.
Stops bleeding and reduces swelling ... older use includes wound bleeding, toxic swellings, and external injury where powdered or rubbed wood is applied locally.
Keeps the denser billet-and-grain lane ... compared with the paired aromatic chip record, this page follows the heavier heartwood presentation and more astringent pain-relief framing.

Regional trauma and pain powders ... where Zi Tan is used for stasis pain, swelling, or bleeding rather than as a major mainstream formula herb.
External application traditions for wounds and swellings ... reflecting the denser heartwood's local-use lane.
Modified pain and blood-stasis combinations with Ru Xiang, Mo Yao, or Yan Hu Suo ... practical pairing logic when fixed pain is the main problem.

Chinese materia medica references describe Zi Tan as salty and neutral, entering the Liver to dispel stasis, stop bleeding, relieve pain, detoxify, and reduce swelling.
Because the medicinal lane is relatively minor and nomenclature can drift, conservative sourcing and identity notes are more important here than for ordinary high-volume herbs.