Synopsis

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

Yerba santa (Eriodictyon californicum) has a long history of traditional use by Native American tribes and later by European settlers in California as a remedy for respiratory conditions, including colds, coughs, and congestion. The leaves were commonly brewed as a tea or smoked to help clear the lungs and sinuses. Traditional herbalists value yerba santa for its aromatic resins and flavonoids, which are thought to have expectorant and decongestant properties, helping to thin mucus and ease breathing.

From a scientific perspective, there is some preliminary evidence supporting yerba santa’s expectorant activity. Studies have identified flavonoids such as eriodictyol and sterubin in yerba santa, which may have anti-inflammatory and mucolytic effects. However, robust clinical trials in humans are lacking, and most evidence comes from animal studies or in vitro research. The herb is included in some over-the-counter herbal cold remedies, but its use remains primarily rooted in tradition rather than strong scientific validation. Overall, while the historical and anecdotal support is notable, the scientific evidence for yerba santa as a decongestant is limited, meriting a moderate evidence rating.

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