Positive Health Online

Abstract

BLOCK and MEAD, Institute for Integrative Cancer Care and Block Center for Integrative Cancer Care, Evanston, Illinois 60201, USA, research@blockmedical.com, have reviewed (243 references) the effects of echinacea, ginseng, and astragalus on the immune system. Abstract: This article examines the literature describing immunological effects of three popular herbal medicines thought to enhance the body's immune defence and thus to help fight infections and cancer. Echinacea is widely used for the prevention and treatment of colds and upper respiratory tract infections. Studies show that the duration and severity of colds is reduced if echinacea is given as soon as symptoms begin to develop. Trials of long-term use of echinacea as a preventive for colds have not shown positive effects. Ginseng has been studied as an anti-fatigue agent, and pre-clinical evidence shows some immune-stimulating activity. Astragalus has shown intriguing immune activity in preclinical trials but is the least studied of the three. It is possible that these herbal medicines can be of benefit to cancer patients. The authors warn however that passive immune therapy with no mechanism to expose tumour antigens, is unlikely to be effective in inhibiting tumour growth.

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References

Block KI, Mead MN. Immune system effects of echinacea, ginseng, and astragalus: a review. Integrative Cancer Therapies 2 (3): 247-267, Sep 2003.