Synopsis

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

Bitter Grass (commonly referring to Vernonia amygdalina or related species) has been traditionally used in various African and Asian cultures to help prevent or treat colds and other respiratory ailments. In ethnobotanical records, Bitter Grass is noted for its use as a general immune tonic and for its purported ability to reduce symptoms such as sore throat, cough, and fever. The use is largely grounded in folk medicine, where decoctions or infusions of the plant are consumed during the early stages of cold or as a preventive measure, especially during seasonal changes.

From a scientific perspective, Bitter Grass contains various phytochemicals such as sesquiterpene lactones, flavonoids, and saponins, which have been shown in in vitro and animal studies to possess antimicrobial and anti-inflammatory properties. However, there is a lack of robust clinical trials specifically demonstrating efficacy for cold prevention or treatment in humans. As such, while some laboratory evidence supports the plausibility of immune-modulating effects, direct scientific validation for its use against the common cold is minimal. The traditional use, combined with preliminary pharmacological data, justifies a moderate evidence rating, but further research is necessary to confirm its effectiveness and safety for this indication.

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