Hemilä H. Does vitamin C alleviate the symptoms of the common
cold?—a review of current evidence. Scand J Infect Dis 1994;26:1–6.
Hemilä H. Vitamin C supplementation and common cold symptoms: factors
affecting the magnitude of the benefit. Med Hypotheses 1999;52:171–8.
Macknin ML. Zinc lozenges for the common cold. Cleveland Clin J Med
1999;66:27–32 [review].
Eby G, Davis DR, Halcomb WW. Reduction in duration of common colds by zinc
gluconate lozenges in a double-blind study. Antimicrobial Agents Chemotherapy
1984;25:20–4.
Al-Nakib W, Higgins PG, Barrow I, et al. Prophylaxis and treatment of
rhinovirus colds with zinc gluconate lozenges. J Antimicrobial Chemotherapy
1987;20:893–901.
Macknin ML, Piedmonte M, Calendine C, et al. Zinc gluconate lozenges for
treating the common cold in children. A randomized controlled trial. JAMA
1998;279:1962–7.
Petrus EJ, Lawson KA, Bucci LR, Blum K. Randomized, double-masked,
placebo-controlled clinical study of the effectiveness of zinc acetate lozenges on common cold
symptoms in allergy-tested subjects. Curr Ther Res 1998;59:595–607.
Prasad AS, Fitzgerald JT, Bao B, et al. Duration of symptoms and plasma
cytokine levels in patients with the common cold treated with zinc acetate. A randomized,
double-blind, placebo-controlled trial. Ann Intern Med 2000;133:245–52.
Eby G. Where’s the bias? Ann Intern Med 1998;128:75
[letter].
Garland ML, Hagmeyer KO. The role of zinc lozenges in treatment of the common
cold. Ann Pharmacolther 1998;32:63–9 [review].
Weismann K, Jakobsen JP, Weismann JE, et al. Zinc gluconate lozenges for
common cold. A double-blind clinical trial. Dan Med Bull 1990;37:279–81.
Jackson JL, Peterson C, Lesho E. A meta-analysis of zinc salts lozenges and
the common cold. Arch Intern Med 1997;157:2373–6.
Macknin ML. Zinc lozenges for the common cold. Cleveland Clin J Med
1999;66:27–32 [review].
Hirt M, Nobel S, Barron E. Zinc nasal gel for the treatment of common cold
symptoms: a double-blind, placebo-controlled trial. Ear Nose Throat J
2000;79:778–80.
Belongia EA, Berg R, Liu K. A randomized trial of zinc nasal spray for the
treatment of upper respiratory illness in adults. Am J Med 2001;111:103–8.
Crisan I, Zaharia CN, Popovici F, et al. Natural propolis extract NIVCRISOL in
the treatment of acute and chronic rhinopharyngitis in children. Rom J Virol
1995;46:115–33.
Szmeja Z, Kulczynski B, Sosnowski Z, Konopacki K. Therapeutic value of
flavonoids in Rhinovirus infections. Otolaryngol Pol 1989;43(3):180–4 [in
Polish].
Brown D. Echinacea root fails to prevent upper respiratory tract infections.
Healthnotes Rev Compl Integr Med 1999;6:6–7 [review].
Hoheisel O, Sandberg M, Bertram S, et al. Echinagard treatment shortens the
course of the common cold: A double-blind, placebo-controlled clinical trial. Eur J Clin
Res 1997;9:261–8.
Melchart D, Linde K, Worku F, et al. Immunomodulation with echinacea—a
systematic review of controlled clinical trials. Phytomedicine 1994;1:245–54
[review].
Henneicke-von Zepelin H, Hentschel C, Schnitker J, et al. 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. Curr Med Res Opin 1999;15:214–27.
Galea S, Thacker K. Double-blind prospective trial investigating the
effectiveness of a commonly prescribed herbal remedy in altering duration, severity and
symptoms of the common cold. Unpublished, 1996.
Schilcher H. Phytotherapy in Paediatrics: Handbook for Physicians and
Pharmacists. Stuttgart: Medpharm Scientific Publishers, 1997, 43–5.
Dorn M, Knick E, Lewith G. Placebo-controlled, double-blind study of Echinacea
pallidae radix in upper respiratory tract infections. Compl Ther Med
1997;5:40–2.
Lindenmuth GF, Lindenmuth EB. The efficacy of echinacea compound herbal tea
preparation on the severity and duration of upper respiratory and flu symptoms: a randomized,
double-blind placebo-controlled study. J Altern Comp Med 2000;6:327–34.
Melchart D, Walther E, Linde K, et al. Echinacea root extracts for the
prevention of upper respiratory tract infections: a double-blind, placebo-controlled
randomized trial. Arch Fam Med 1998;7:541–5.
Grimm W, Mueller HH. A randomized controlled clinical trial of the effect of
fluid extract of Echinacea purpurea on the incidence and severity of colds and respiratory
infections. Am J Med 1999;106:138–43.
Brikenborn RM, Shah DV, Degenring FH. Echinaforce and other Echinacea
fresh plant preparations in the treatment of the common cold: A randomized,
placebo-controlled, double-blind clinical trial. Phytomedicine 1999;6:1–5.
Bone K. Clinical Applications of Ayurvedic and Chinese Herbs: Monographs
for the Western Herbal Practitioner. Queensland, Australia: Phytotherapy Press, 1996,
96–100.
Thamlikitkul V, Dechatiwongse T, Theerapong S, et al. Efficacy of
Andrographis paniculata, Nees for pharyngotonsillitis in adults. J Med Assoc
Thai 1991;74:437–42.
Melchior J, Palm S, Wikman G. Controlled clinical study of standardized
Andrographis paniculata extract in common cold—a pilot trial.
Phytomedicine 1996;3:314–8.
Hancke J, Burgos R, Caceres D, Wikman G. A double-blind study with a new
monodrug Kan Jang: Decrease of symptoms and improvement in recovery from common colds.
Phytother Res 1995;9:559–62.
Cáceres DD, Hancke JL, Burgos RA, et al. Use of visual analogue scale
measurements (VAS) to assess the effectiveness of standardized Andrographis
paniculata extract SHA-10 in reducing the symptoms of common cold. A randomized double
blind-placebo study. Phytomedicine 1999;6:217–23.
Melchior J, Spasov AA, Ostrovskij OV, et al. Double-blind, placebo-controlled
pilot and phase III study of activity of standardized Andrographis paniculata Herba
Ness extract fixed combination (Kan jang) in the treatment of uncomplicated upper-respiratory
tract infection. Phytomedicine 2000;7:341–50.
Josling P. Preventing the common cold with a garlic supplement: a
double-blind, placebo-controlled survey. Adv Ther 2001;18:189–93.
Scaglione F, Cattaneo G, Alessandria M, Cogo R. Efficacy and safety of the
standardized ginseng extract G 115 for potentiating vaccination against common cold and/or
influenza syndrome. Drugs Exptl Clin Res 1996;22:65–72.
Beuscher N, Kopanski L. Stimulation of immunity by the contents of
Baptisia tinctoria.Planta Med 1985;5:381–4.
Murray MT. The Healing Power of Herbs. Rocklin, CA: Prima Publishing,
1995, 162–72.
Bradley PR, ed. British Herbal Compendium, Vol. 1. Bournemouth,
Dorset, UK: British Herbal Medicine Association, 1992, 119–20.
Schilcher H. Phytotherapy in Paediatrics. Stuttgart, Germany:
Medpharm Scientific Publishers, 1997, 126–7.