Vitamin B12: Cyanocobalamine
CLASS: 
Water soluble vitamin
ROLE:Red Blood Cell MaturationNerve cell integrityStored in liver
SOURCES: Animal foodsDairy productsYeast
RECOMMENDED DAILY INTAKE (RDI): 2 micrograms
DEFICIENCY STATE: Tiredness, weakness, lethargySore tongueAnaemiaSpinal cord diseaseDementiaSensory loss
OVERDOSE STATE: May produce Iron or Folate deficient Anaemia
RISKS: Gastrointestinal diseaseliver diseaseVegetarianismElderlyPsychiatric in-patientsSmokersMedication: colchicine (for gout), cholestyramine (for high cholesterol)
DIAGNOSIS: Blood tests
OTHER NUTRIENT INTERACTIONS: Folate