Echinacea Root Extracts For The Prevention Of Upper Respiratory Tract Infections: A Double-blind, Placebo-controlled Randomized Trial
Notes for this study:
||Upper respiratory tract infections. % and 95% CI who had at least one infection. Placebo: 37% (27%-47%) Angustifolia, 32% (23%-41%) Purpurea: 29% (20%-38%) Mean and 95% CI days until first influence. Placebo: 65 (59-70) Angustifolia: 66 (61-72) Purpurea: 69 (64-74)
|Number of Subjects
In a randomized, double-blind, placebo-controlled trial, 302 participants were given 50 drops twice daily of a 30$ ethanol 1:11 plant:extract product of echinacea Angustifolia, echinacea purpura, or placebo for 12 weeks
There were 113 upper respiratory tract infections but while there were fewer in the echinacea groups, the difference compared with the placebo wasn't statistically significant.