Synopsis

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

Grass-leaved calamus (Acorus gramineus) has a long history of use in traditional medicine systems, particularly in East Asia. In Traditional Chinese Medicine (TCM), it is known as "Shi Chang Pu" and has been used to address a variety of gastrointestinal symptoms, including belching, indigestion, and bloating. The traditional rationale is based on its purported ability to "harmonize the stomach" and "resolve phlegm," which are believed to contribute to symptoms like belching. Historical texts and pharmacopoeias from China and Japan mention its use for digestive complaints, including belching, often as part of herbal formulas.

However, the evidence supporting its use is primarily anecdotal and based on centuries of empirical practice rather than rigorous scientific validation. While some laboratory studies have investigated related species (such as Acorus calamus) for possible anti-spasmodic, carminative, or digestive effects, direct clinical trials or modern pharmacological studies specifically evaluating Acorus gramineus for belching are lacking. Therefore, while traditional use is well-documented, scientific evidence remains limited, and the rating reflects the absence of robust clinical trials.

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