I started to have a very painful wrist from repetitive motion in my right wrist and I am right handed. Had a lot of animals to care for so this really bad. Heard of B6 and didn't believe it could be that simple, but it was. Now I take a multi B and only have problems if I discontinue them. Took straight B6 at the start.
Carpal tunnel pain has its origin in low vitamin D.
If you don't get enough sun hours you will be low on Vitamin D and that causes carpal tunnel pain and could also increase the risk of breast cancer. Dr. Raimund von Helden in Germany has done for years intensive research on low levels of vitamin D and the side effects.
Germany doesn't have many sun hours therefore the body cannot produce enough vitamin d by sun shine. Dr. von Helden has written many books about the connection of breast cancer, carpal tunnel syndrome and low levels of vitamin d.
I myself have suffered from carpal tunnel pain. The remedy: take 10,000 units Vitamin d together with 1 tablet of vitamin K2 MK 7. I use these 2 supplements once a day as long as needed. The pain goes away almost immediately. However, when you have pain, then you are way low on Vitamin D and you need to fill up your bodily reservoirs. Constant low level of vitamin D can lead also to breast cancer. Dr. Von Helden has done a lot of research. When you are low on Vitamin D you need to get up your levels. When my wrists are hurting, I take vitamin D in higher amounts for a couple weeks daily to bring up my level. In the winter I need to take much more than in the summer. Your doctor can find out your vitamin D level with a blood test. You can fill up your vitamin D level in a few days or weeks depending how much you take.
I personally recommend not to exceed 10,000 IU per day. I have taken higher dosages but it doesn't bring more benefits. Don't forget to take one vitamin K2 MK 7.