A review published in the Cochrane Database of Systematic Reviews (2006; Issue 2: CD004504) evaluated the use of herbal therapies for the treatment of non-specific low back pain.
The authors concluded that several herbal preparations performed better than placebo for pain relief. These included cayenne (Capsicum frutescens), devil’s claw (Harpagophytum procumbens), and white willow bark (Salix alba).