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1. A randomized controlled trial of the effect of fluid extract of Echinacea purpurea on the incidence and severity of colds and respiratory infections.

Authors: W Grimm; H H Müller
Journal: Am J Med Date: 1999-02 Impact factor: 4.965

Authors: R J Mullins
Journal: Med J Aust Date: 1998-02-16 Impact factor: 7.738

Authors: D Melchart; E Walther; K Linde; R Brandmaier; C Lersch
Journal: Arch Fam Med Date: 1998 Nov-Dec

Authors: D M Eisenberg; R B Davis; S L Ettner; S Appel; S Wilkey; M Van Rompay; R C Kessler
Journal: JAMA Date: 1998-11-11 Impact factor: 56.272

Authors: L G Miller
Journal: Arch Intern Med Date: 1998-11-09

5 in total

3 in total

Authors: T Abdullah
Journal: J Natl Med Assoc Date: 2000-01 Impact factor: 1.798

Authors: Nicole L Cockayne; Margaret Duguid; Gillian M Shenfield
Journal: Br J Clin Pharmacol Date: 2005-02 Impact factor: 4.335

Authors: Foroogh Namjooyan; Rahil Ghanavati; Nastaran Majdinasab; Shiva Jokari; Mohammad Janbozorgi
Journal: J Tradit Complement Med Date: 2014-07

3 in total