Synopsis

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

Hu Zhang (虎杖, Polygonum cuspidatum), also known as Japanese knotweed, is commonly used in Traditional Chinese Medicine (TCM). In TCM, Hu Zhang is categorized as an herb that invigorates blood and clears heat, and it is sometimes included in formulas for pediatric constipation, especially when associated with heat accumulation or blood stasis. Historical materia medica texts, such as the "Ben Cao Gang Mu" (Compendium of Materia Medica), reference its use for promoting bowel movements and relieving constipation, particularly among children when the clinical presentation fits TCM diagnostic criteria. However, the body of scientific literature specifically investigating Hu Zhang for pediatric constipation is extremely limited, and there are no high-quality randomized controlled trials validating its efficacy or safety for this indication in children. Most support for its use in pediatric constipation is based on traditional practice and anecdotal reports, rather than rigorous clinical research. Some bioactive compounds in Hu Zhang, such as resveratrol and emodin, have demonstrated laxative effects in laboratory or animal studies, but these findings have not been directly translated to pediatric clinical practice. Overall, while its use is rooted in TCM tradition, evidence from modern scientific studies is minimal, and caution is warranted when using it in children due to potential side effects and lack of robust safety data.

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