What is "devil's claw," and can it be used for osteoarthritis?

Devil's claw (Harpagophytum procumbens) is a plant that grows in southern Africa. Small hooks in the plant's fruit give the plant its memorable name. Devil's claw has been used for thousands of years in Africa to treat a whole host of diseases, including fever, malaria, gastrointestinal problems, liver problems, kidney disorders, rheumatoid arthritis, and osteoarthritis. The medicinal ingredient in Devil's Clas is extracted...

