Evidence supporting the use of: Pearl
For the health condition: Cough (dry)

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Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Pearl (Zhen Zhu, 珍珠) has been utilized in Traditional Chinese Medicine (TCM) for centuries, primarily for its supposed ability to "calm the spirit," improve skin, and promote healing. In some classical TCM texts and prescriptions, pearl powder is occasionally included in formulas intended for respiratory conditions, including cough—typically those characterized as "dry" and due to Yin deficiency or internal heat. The rationale in TCM is that pearl is thought to nourish Yin and moisten dryness, possibly benefiting a dry cough.

However, the direct use of pearl specifically for dry cough is not a central or common application, and there is minimal documentation of its efficacy for this indication even in traditional sources. Furthermore, there is no robust scientific evidence or clinical trial data supporting the use of pearl (or its main component, calcium carbonate, and trace minerals) as an effective treatment for cough of any kind. The available evidence is almost entirely anecdotal or based on traditional practice rather than rigorous scientific validation. Thus, while its use is justified by tradition to a limited extent, the supporting evidence remains weak.

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