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Vitamin B12 is part of the vitamin B complex, which includes thiamin, niacin, vitamin B6, folate and vitamin B12. Each of these vitamins has its "own unique role in the body, but most B vitamins have a role in helping your body's cells to produce energy,"
Vitamin B 12 benefits the central nervous system in many important ways: It helps maintain the health of nerve cells
Symptoms of Deficiency:- Someone with low vitamin B12 may lose their appetite, lose weight or feel tired and weak. Depression, poor memory ,numb or tingling feeling in the hands and feet, a loss of balance, a sore mouth or tongue and constipation.
Sources;- The vitamin B12 present in foods like chicken, meat and fish were found to be the most absorbable.You can also take vitamin B 12 supplements.