The article was indeed from the BHA which is, as noted on the talk page, recommended by the BMA as a sound source for information on homeopathy. The doctor in question not only wrote about the particular treatment, but also about the general use of thuja and so was a perfectly reasonable source for the claim. In addition, a further source was then provided. Re the original research point: now you are just being ridiculous. OR relates to editors here, not to research done by others and then published in reliable sources.