I have a cracked Collarbone and the pain is unbearable. I have taken a lot of pain pills to kill the pain and have also used Voltaren to help with the pain. This would help for a day or so then the pain would reappear. My wife is a registered nurse and recommended that I try the Photizo Light on my shoulder. After the first session the pain was gone after so many weeks of pain. By the second time I used the Light, I could do weights again. I would recommend the Photizo Light for pain relieve.