Vitamin B12

Vitamin B12

Cyanocobalamin helps with the nervous and immune system functions as well as red blood cell formation and energy production.

Good Food Sources include meats and fish. Clams are very high in B12.

Recommended Intake is about 2.5 mcg daily depending on gender and age.

Deficiency can lead to fatigue, weakness, sore tongue, reduced concentration and mood changes.


  • B12 is one of the more common deficiencies seen and can be more common in those that have restricted diets or problems with absorption in the bowel like inflammatory bowel disease or coeliac disease
  • Deficiency can cause megaloblastic anaemia - fewer but bigger red blood cells
  • Oral contraceptives may reduce B12 levels
  • Excess alcohol may reduce B12 levels