I concur that . I have been benefited with Castor oil. It's really good for Lumbar problems for sure.
Castor oil plant - Wikipedia, the free encyclopedia
"The use of castor bean oil ("eranda") in India has been documented since 2000 BC in lamps and in local medicine as a laxative, purgative, and cathartic in Unani, Ayurvedic and other ethnomedical systems. Traditional Ayurvedic medicine considers castor oil the king of medicinals for curing arthritic diseases. It is regularly given to children orally, for de-worming.[citation needed]" - Wikipedia