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When to seek medical help See a doctor promptly if you have spreading redness or warmth around the site, discharge or a fever, numbness or weakness that does not settle, or any swelling of the face, lips or throat or difficulty breathing, which can signal a rare allergic reaction and is a medical emergency

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Insulin sensitivity and glucose metabolism

Vitamin B12, also known as cobalamin, is crucial for various bodily functions, including the production of red blood cells, neurological function, and DNA synthesis

Causes of High B12 Levels in Blood Underlying disease If your test shows excessive B12 levels and you are not taking any supplements , it may point to an underlying medical problem