Vitamin B12: The 100 words
B12 deficiency is commoner that you think. We have a good supply so occasional dietary deficiencies go unnoticed. Prolonged dietary deficiency will commonly cause fatigue in the early stages. Low B12 can occur in the following cases;
Strict vegetarians / vegans
People taking PPI (antacid drugs) or metformin for diabetes
Intrinsic factor deficiency - inability to absorb B12 from the gut
B12 is best taken as a supplement in the form of methylcobalamin, as a suckable tablet. There is no risk associated from overdosage. This vitamin is essential for brain, nerve and blood cell health.
Food sources: red meat, trace in eggs