Essential for red blood cell production, nerve function, and DNA synthesis.
When Levels are High
Usually from excess supplementation. High levels are rare but may be seen in liver disease or blood cancers (e.g., leukaemia or polycythemia).
When Levels are Low
Low levels are common and can cause fatigue, weakness, anaemia, and nerve problems (e.g., tingling in the hands and feet). Increasing evidence that B12 over 400 can improve cognitive function
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Understanding trends in the results
Low levels may suggest malabsorption, particularly in conditions like pernicious anaemia, Crohn's disease, or after gastric surgery. Persistent low levels can lead to nerve damage and neurological symptoms. Regular monitoring is needed, particularly in older adults or those on long-term metformin or proton-pump inhibitors (PPIs).
We’re working on it — updates coming soon
