Often the trial and research is sponsored by the powerful pharma industry. There was an article in the British Medical Journal against Arnica. I had replied to that flawed trial:
Replies to Trial shows that homoeopathic arnica is no better than placebo
Last year, my wife and I had given a memorandum to the British Parliament which had formed a committee to decide whether homeopathy should be financed by the British Govt.
This memorandum is listed on the web site of the UK Parliament:
Uncorrected Evidence hc56
Dr. Vijay Vaishnav
The Ultimate guide to Homeopathy - Modern Medicine
Homeopathy- Modern Medicine