BACKGROUND
Echinacea purpurea stimulates the immune response and is promoted to reduce symptom severity and the duration of upper respiratory tract infections. We sought to determine the efficacy of a standardized preparation of E purpurea in reducing symptom severity and duration of the common
OBJECTIVE
The effects of Echinacea purpurea on electrocardiographic and blood pressure measurements in healthy volunteers were evaluated.
METHODS
Healthy volunteers were randomized to receive a single 350-mg dose of E. purpurea or placebo in a crossover fashion with a seven-day washout period
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