How about magnets?

Life's delemmas:
"Primarily permanent magnets have been used to relieve pain, such as with arthritis, but magnets also show promise in promoting and
shortening the time it takes to heal fractures, soft tissue sports
injuries, and joint (knee, tennis, wrist) injuries. Magnetic therapy
has also been used to treat migraine headaches and diseases involving
poor circulation."

My Take:

Tried them -- didn't work for me. Your mileage may vary.