Converts food into energy, keeps red blood cells healthy, makes antibodies, maintains nerve function, enhances the immune system, helps prevent heart disease. Where you get it: Poultry, fish, pork, eggs, and whole grains. Watch Out: Pyridoxine in high doses can cause balance difficulties and nerve injury. RDA: Between 1.6 to 2.0 mg for adults. Also known as Vitamin B-6.