America's pharmacy says this about B6:
"Pyridoxine, also known as vitamin B6, is a water-soluble B vitamin involved in the conversion of carbohydrates and protein into sources of energy. Water-soluble vitamins are not stored by the body, therefore they need to be replaced regularly in the diet. Pyridoxine is also necessary to maintain healthy nerve cell function, and is involved in the production of red blood cells and hormones. Dietary sources of pyridoxine include whole grain breads and cereals, spinach, green beans, bananas, carrots, eggs, chicken, and walnuts. Pyridoxine supplementation is used to treat pyridoxine deficiency, which may be due to malabsorption or genetic disorders, alcoholism, poor dietary intake, or certain medications. Symptoms of pyridoxine deficiency include dry, peeling skin, mental confusion, nerve dysfunction, and poor coordination. Pyridoxine can also be used to treat medical conditions such as anemia and nerve disorders. Typical doses used in the treatment of pyridoxine deficiency range from 10 to 250mg daily, but doses up to 600mg daily have been used. Potential side effects of pyridoxine include and increased sensitivity to light, rash, headache, stomach upset, allergic reactions, and tingling or numbness in the hands and feet. "