Vitamin B6 is usually found in food and does not need to be taken in supplement form. However, vitamin B6 is used in the prevention of polyneuropathy and the treatment of tuberculosis. In addition, excess or deficiency of vitamin B6 can lead to polyneuropathy.

Polyneuropathy is the most common form of peripheral neuropathy, involving damage to the peripheral nerves – outside the brain and spinal cord. In this form of neuropathy, many nerves are affected.