A 2009 study published in Phytotherapy Research supports this, and reveals that castor oil helps relieve pain among patients with knee osteoarthritis.10 (articles.mercola.com)
The scientists concluded that «the results suggested that Arctium lappa L. (burdock) root tea improves inflammatory status and oxidative stress in patients with knee osteoarthritis». (supernaturalacnetreatment.com)
That possibility led to a large NIH - funded clinical trial of the supplements involving patients with knee osteoarthritis. (scientificamerican.com)