Echinacea supplementation has altered the GI microbiota. The health consequences associated with this change are unknown but previous research has shown increased Bacteroides concentrations associated with diarrhoea, inflammatory bowel disease and increased risk of colon cancer. Additional research should delineate the role of Echinacea in the stimulation of Bacteroides and describe the effects of other botanical supplements to the GI microbiota.
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Hill et al. (2006) studied this question.