is a Professor at Harvard Medical School, Boston, and Co-Director of the Glenn Laboratories for Aging Research
Vitamin B 12 is a water-soluble vitamin which the body needs it for the development of nerve cells, for protein and nucleic metabolism and for the absorption of folic acid into the red blood cells
Symptoms of low blood sugar may include dizziness or light-headedness, sweating, shakiness, blurred vision, slurred speech, weakness, anxiety, hunger, headache, irritability or mood changes, confusion or drowsiness, fast heartbeat, feeling jittery
The vitamin is also essential for DNA synthesis and red blood cell formation, meaning deficiency can have wide-ranging effects beyond the nervous system, including fatigue and cognitive difficulties