What the best studies for echinacea and elderberry show

Gaia Herbs Quick Defense with Echinacea and Elderberry

In the largest and best study on echinacea (co-authored by an employee of an echinacea maker), researchers randomly assigned 359 people to take echinacea or a placebo at the first sign of cold symptoms. The echinacea takers took 10,200 milligrams the first day and 5,100 mg a day for the next four days.