Vitamin B6, pyridoxine, helps the body break down protein and maintain the health of red blood cells, the nervous system, and parts of the immune system. Pyridoxine is found in fish, liver, pork, chicken, potatoes, wheat germ, bananas, and dried beans. This vitamin comes in regular and extended-release (long-acting) tablets. Pyridoxine has been used as an intervention for skin reactions in patients with cancer.