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Another factor may be the heterogeneity of patient responses

This is thanks to growing clinical evidence

Vitamin B12 deficiency can also cause symptoms that affect your brain and nervous system (neurological symptoms), including: numbness muscle weakness psychological problems, which can range from mild depression or anxiety, to confusion and dementia problems with balance and coordination pins and needles incontinence When to see a GP See a GP if you're experiencing symptoms of vitamin B12 or folate deficiency anaemia

However, B12 shots typically start to show their effects within a few days to a week in most people