Very soothing.
I had a plate inserted in my upper arm to repair a fracture humerus.  A doctor friend recommended I try castor oil to ease the pain as the 10 screws adapted to my bone.  I can't express how grateful I am for that advice and how well this works.  It is also soothing my muscle soreness as I go through PT to regain use of my arm.
Rating: 5 stars