Clethra Loosestrife Herb Classic Formulas … Natural Herb Library

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Clears heat and promotes urination ... Zhen Zhu Cai is a folk herb for edema, damp accumulation, urinary irritation, and heat-lodged water metabolism problems.
Invigorates Blood and reduces swelling ... traditional use extends to bruising, traumatic pain, and lingering fixed swelling where stasis has formed.
Resolves toxicity and dissipates abscesses ... it is applied to mastitis, inflamed swellings, and hot suppurative lesions in regional practice.
Relieves rheumatic pain and mild channel obstruction ... some traditions extend it to joint soreness and painful wind-damp patterns.

Edema and damp-heat pairings with Che Qian Cao or Jin Qian Cao ... common logic when heat, swelling, and urinary difficulty coexist.
Trauma and swelling combinations with Ru Xiang, Mo Yao, or Ji Xue Teng ... used when pain, bruising, and fixed tenderness are the priority.
Heat-toxin and breast-swelling formulas with Pu Gong Ying or Jin Yin Hua ... a regional extension of the herb's detoxifying role.

Southern and folk materia medica sources describe Zhen Zhu Cai as bitter-pungent and neutral, using the root or whole herb to clear damp-heat, move Blood, and resolve swelling.
Its strongest identity is as a practical regional herb for edema, injury, and local inflammatory lesions rather than as a famous canonical formula ingredient.