Synopsis

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

Bitter Grass (commonly referring to various species such as Andrographis paniculata or Swertia chirata) has a history of use in traditional medicine systems, particularly in Asia, for treating mouth ulcers and canker sores. Traditional Chinese Medicine (TCM) and Ayurveda have both used “bitter” herbs to clear heat and toxins, which are thought to contribute to the development of mouth sores. The rationale is that the bitter compounds possess anti-inflammatory and antimicrobial properties, which may help alleviate pain and reduce healing time.

However, direct scientific evidence specifically validating the use of Bitter Grass for canker sores (aphthous ulcers) is limited. Most available studies on these herbs focus on broader anti-inflammatory, antimicrobial, or immunomodulatory effects, rather than direct clinical trials for oral ulcers. As such, the primary justification for their use is rooted in traditional practice and anecdotal reports, not modern clinical research. Some small-scale or animal studies suggest potential benefits, but there is insufficient high-quality, targeted research to strongly support efficacy or safety for this particular condition. Therefore, while tradition supports its use, the strength of evidence is moderate at best.

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