A daily total of a few hundred milligrams of individual B-6, especially if taken in addition to the entire B-complex to ensure balance, is very safe indeed. Those with lower blood levels of vitamin B6 had higher risks of lung cancer, no matter what their smoking status. Doctors say healthy levels of B vitamins help make and maintain healthy DNA – an important factor in the prevention of cancer. Vitamin B6 is in a variety of foods including meats, poultry, fish, grains, beans and some fruits and vegetables – such as avocados, broccoli and bananas. Such a great mood lifter!