Practitioners of CAM are often regarded as sources of reliable health information. Canadian investigators sought to determine physicians’ impressions of the quality and effect of vaccine information given to patients by CAM providers. Surveys were mailed to random samples of GPs and specialists licensed in British Columbia in 2000 and 2001. An overall response rate of 27% was obtained. Ninety percent of respondents (178/197) felt the vaccine information from CAM providers was unreliable and 79% (165/210) felt that such information made patients less inclined to use vaccines. Seventy-three percent (202/277) were aware of patients refusing vaccinations based on such information. Responding physicians felt that CAM practitioners dispense poor-quality vaccine information and that patients or their children may remain unimmunised as a result.