Brain scans can now measure brain volume and a study of patients deficient in vitamin B12 showed their brain volume at half of those with high blood levels of vitamin B12. It is an important component of the nervous system and for DNA synthesis. Without B12, the body can`t manufacture blood and leads to anemia. Vitamin B12 is also responsible for maintenance of memory. Deficiency of B12 causes fatigue, diarrhea, memory loss, anemia and poor nerve function.

Recommended dosage of B12 is 500 mcg a day. The supplement is inexpensive but difficult to absorb through the digestive system. So look for sublingual (under the tongue) forms, those that are sealed to prevent destruction in the gut, or get a B12 injection. Be sure to get enough vitamin B12 to fuel your brain, your blood, and your heart.