Echinacea for the prevention of upper respiratory tract infections.
Gunning
K
K
University of Utah, Salt Lake City, USA. kgunning@pharm.utah.edu
Steele
P
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D004311:Double-Blind Method; D006801:Humans; D008875:Middle Aged; D008517:Phytotherapy; D010936:Plant Extracts / Q000627:therapeutic use; D010946:Plants, Medicinal / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D012141:Respiratory Tract Infections / Q000517:prevention & control*
D010936:Plant Extracts