We are told about the value of complementary therapy, but this is usually activist cant. Now research shows that Echinacea does not work. From the BMJ news - an abstract of an article in the Lancet last week.
Echinacea is a popular herbal remedy for colds. As with many other popular herbal remedies, evaluation has been patchy and inconclusive. A carefully controlled and double blinded experiment now provides the strongest evidence so far that Echinacea does not work, thanks to 399 volunteers who agreed to be inoculated with rhinovirus type 39.
For seven days before the inoculation and five days afterwards, the young adult volunteers took one of three well defined formulations of Echinacea or a placebo. Treatment was randomly allocated. Altogether 349 of the volunteers caught a cold. Compared with placebo, none of the formulations prevented infection, relieved symptoms, or speeded up recovery. The volunteers were isolated in hotel rooms throughout the experiment, where they completed questionnaires of symptoms twice a day and had a nasal lavage every morning. Their nasal secretions were weighed and analysed for viruses, leucocytes, and inflammatory markers. The volunteers came back three weeks after the experiment to have blood taken to measure their serum concentrations of neutralising antibody to the rhinovirus.
The Echinacea preparations, which were isolated from the species Echinacea angustifolia, had no impact on any measure of infection including viral titres or inflammatory markers in nasal secretions. They contained different proportions of the alkamides, polysaccharides, and caffeic acid derivatives thought to be active in Echinacea products available on the high street. These products are likely to be equally ineffective.
New England Journal of Medicine 2005;353: 341-8