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Re: [escepticos] Re: própolis, equinácea y otras hierbas




A ver si esto te ayuda. Parece el típico remedio de la abuela que puede que ayude o puede que no, dudosamente mejor que un placebo y peor que paracetamol, hidratación y vitamina C.
Salud,


Marmi



Chochrane Review: Echinacea extracts are widely used by patients and practitioners in certain parts of Europe and the United States for preventing and treating upper respiratory tract infections. Despite the widespread use, there is considerable debate about the effectiveness of Echinacea. A detailed Cochrane review published in 2005 assessed the available evidence from randomized clinical trials investigating the effectiveness of Echinacea extracts for the prevention and the treatment of the common cold. To be included in the overview, trials must include clinical outcome measures related to occurrence, severity or duration of infections. Sixteen trials, 8 prevention trials and 8 treatment trials, with a total of 3,396 participants were reviewed. The overall results suggest that some Echinacea preparations may be better than placebo, effective in both the treatment and prevention of the common cold, and may be more effective for treatment when taken at the onset of symptoms, however, more research is needed to confirm this effect.13

* In the 5 prevention trials with a placebo control, 2 found a statistically significant lower incidence of infection in the treatment group. 14 15 One (Forth, 1981) used an herbal preparation containing various herbs including Echinacea angustifolia and pallida roots and was given in drops or tablets for 16 weeks. The second study (Hoheisel 1997) used a pressed juice of Echinacea purpurea given in drops for 10 days. Hoheisel and colleagues also found that the duration of illness was significantly shorter in the treatment group. The remaining trials found only trends in favor of the treatment groups.
* In all 3 prevention trials with no treatment controls (Helbig 1961, Kleinschmidt 1965, Freyer 1974), the number of children with infection was significantly lower in the group receiving the Echinacea combination compared to the no treatment group. All 3 trials lasted 6 weeks and used an herbal preparation containing various herbs including Echinacea angustifolia and pallida roots administered in drops. 16 17 18
* 6 of the 8 treatment trials suggest significantly positive results for the tested preparations over placebo. Preparations found to be effective included Echinacea purpurea root extract drops, Echinacea pallida root extract drops, a combination tablet containing Echinacea purpurea root, a combination tablet containing Echinacea angustifolia and pallida roots, and a combination tincture containing Echinacea angustifolia. 12 19 20 21 22 23 In the remaining trials, one found significant results for a subgroup only (Henneicke 1997) and two found no difference after treatment (Braunig 1992 low dose, and Dorn 1989.)24 25