Synopsis

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

Yerba santa (Eriodictyon californicum) has been traditionally used by Native American and Hispanic communities in California and the southwestern United States for the relief of respiratory ailments, particularly those involving sore throat, cough, and congestion. Historical records indicate that the leaves were chewed or brewed as a tea to soothe sore throats and reduce irritation in the mouth and throat. The plant contains flavonoids and phenolic compounds, which are believed to have mild anti-inflammatory and antimicrobial effects; these properties may contribute to its traditional use for throat discomfort.

However, scientific validation is limited. While some laboratory studies have shown that yerba santa extracts possess antimicrobial and antioxidant activity, there is little direct clinical evidence supporting its effectiveness specifically for sore throat in humans. Most of the support for this use remains anecdotal or based on historical ethnobotanical reports rather than controlled clinical trials. Some herbalists continue to recommend yerba santa for throat irritation based on its demulcent (soothing) properties, but mainstream medical organizations do not recognize it as a validated treatment. In summary, yerba santa’s use for sore throat is supported primarily by tradition, with only modest scientific rationale and very limited clinical evidence.

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