I have psoriatic arthritis, which is somehow different from the other forms.
A couple of nights ago, I was taking an herbal tea which I concocted to help me sleep and to also aid in prevention of a return of my bladder cancer. The tea included Cat's Claw. When I woke up the next day, the arthritis was much reduced. When I checked the internet, I found that Cat's Claw is sometimes used for arthritis.
You should check for side effects and contraindications before using Cat's Claw, as the American Cancer Society has posted some alerts.
Rosemary