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

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Synopsis

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

Mentha haplocalyx, commonly known as Chinese mint or "Bo He" in Traditional Chinese Medicine (TCM), has a long history of use as a remedy for various respiratory ailments, including cough, particularly the dry type. In TCM, Bo He is classified as a cooling herb that disperses wind-heat, soothes the throat, and relieves cough by promoting the flow of Qi in the lung and liver meridians. Historical texts such as the "Shennong Bencao Jing" and "Compendium of Materia Medica" describe its use for cough, sore throat, and feverish conditions. The traditional preparation involves decocting the leaves or using them in herbal combinations targeting symptoms associated with external wind-heat invasion, which often includes a dry cough.

Scientific evidence for Mentha haplocalyx in the treatment of dry cough is limited. Some studies have identified menthol and other volatile oils in the plant with mild antitussive (cough-suppressing) and soothing effects on the respiratory tract, but these are not robustly validated for clinical efficacy in dry cough specifically. Thus, the use is primarily justified by tradition, with a low to moderate level of supporting evidence from small pharmacological studies and a large body of historical use.

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