G Köhler

Efficacy and Safety of a Fixed Combination Phytomedicine in the Treatment of the Common Cold (Acute Viral Respiratory Tract Infection): Results of a Randomised, Double Blind, Placebo Controlled, Multicentre Study

Hans‐Heinrich Henneicke‐von Zepelin, C Hentschel, J Schnitker et al. · Current Medical Research and Opinion · 1999 · 72 citations

A randomized, double-blind, placebo-controlled, clinical dose–response trial of an extract of Baptisia, Echinacea and Thuja for the treatment of patients with common cold

Belal Naser, B. Lund, Hans‐Heinrich Henneicke‐von Zepelin et al. · Phytomedicine · 2005 · 32 citations

Clinical Dose–response Trial, Clinical Therapeutic, Common Cold +5

Efficacy and mode of action of an immunomodulator herbal preparation containing Echinacea, wild indigo, and white cedar.

P W Wüstenberg, Hans‐Heinrich Henneicke‐von Zepelin, G Köhler et al. · PubMed · 1999 · 20 citations

Esberitox<sup>®</sup> N as Supportive Therapy when Providing Standard Antibiotic Treatment in Subjects with a Severe Bacterial Infection (Acute Exacerbation of Chronic Bronchitis)

Wilfried Hauke, G Köhler, Hans‐Heinrich Henneicke‐von Zepelin et al. · Chemotherapy · 2002 · 18 citations