[escepticos] Re: própolis, equinácea y otras hierbas

[Pablo Marín Ramón <pabmara@xxxxxxxxxx>]

Gracias por las referencias. No tengo acceso a los artículos completos pero
buscando un poco en Google he conseguido algunos resúmenes de los mismos en
PubMed. Los incluyo a continuación.

> Grimm W, Müller HH. A randomized controlled trial of the effect of fluid 
> extract of Echinacea purpurea on the incidence and severity of colds and 
> respiratory tract infections. Am J Med 1999;106:138-43

CONCLUSION: Treatment with fluid extract of Echinacea purpurea did not
significantly decrease the incidence, duration or severity of colds and
respiratory infections compared to placebo.

> Hoheisel O, Sandberg M, Bertram S, et al. Echinacea shortens the course of 
> the common cold: a double-blind, placebo-controlled clinical trial. Eur J 
> Clin Res 1997;9:261-8

De éste no he conseguido nada.

> 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

CONCLUSION: In this study a prophylactic effect of the investigated echinacea
extracts could not be shown. However, based on the results of this and 2 other
studies, one could speculate that there might be an effect of echinacea
products in the order of magnitude of 10% to 20% relative risk reduction.
Future studies with much larger sample sizes would be needed to prove this
effect.

Resumiendo: no se ha observado una reducción significativa de la incidencia
al tomar equinácea. Ambos estudios utilizaron en torno a 100 sujetos para
llevar a cabo los experimentos.

PS: es una lástima que se tenga que pagar para tener acceso a multitud de
artículos científicos hoy en día.
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