Synopsis

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

Grass-leaved calamus (Acorus gramineus), like its close relative Acorus calamus, has a history of use in traditional medicine systems, particularly in Asia. Traditional Chinese Medicine (TCM) and other herbal practices have employed Acorus species for various ailments, including respiratory issues such as congestion, cough, and asthma. The rhizomes were sometimes used in decoctions or powders intended to "open the orifices" and clear phlegm, which conceptually overlaps with the modern understanding of treating lung congestion. However, direct references to Acorus gramineus specifically for lung congestion are less common than for Acorus calamus, and much of the traditional use is based on broader applications of the genus.

From a scientific perspective, there is currently little to no robust clinical evidence supporting the effectiveness of Grass-leaved calamus for treating lung congestion. Some laboratory studies on related species note antispasmodic, anti-inflammatory, and expectorant-like effects, but these are preliminary and not specific to Acorus gramineus or to human clinical outcomes. Additionally, safety concerns exist due to the presence of certain potentially toxic constituents in Acorus species. Therefore, while the use of Grass-leaved calamus for lung congestion is grounded in tradition, it lacks strong scientific validation, and the evidential support is weak.

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