Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Hu Zhang (虎杖), also known as Polygonum cuspidatum or Japanese Knotweed, is traditionally used in Chinese medicine for its purported hemostatic (bleeding-stopping) properties. Historical texts, such as the "Compendium of Materia Medica" (Bencao Gangmu), reference Hu Zhang's use to "cool blood" and stop bleeding, particularly for external injuries, wounds, and nosebleeds. The root is sometimes ground into a powder and applied directly to bleeding sites or incorporated into poultices. The use is primarily based on empirical observation and the herb's classification as having the ability to clear heat and resolve toxicity, which in traditional theory is associated with reducing bleeding.

Modern pharmacological studies on Hu Zhang focus mostly on its constituents, such as resveratrol and emodin, which have anti-inflammatory and antioxidant properties. However, there is little direct scientific investigation into its topical hemostatic effects in humans or animals. Some in vitro studies suggest possible wound-healing or antimicrobial activities, but these do not directly translate to proven efficacy in stopping external bleeding. Therefore, while Hu Zhang is traditionally used for external bleeding, robust scientific validation for this use is lacking, and evidence remains at the level of traditional practice and anecdote.

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