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B12 also plays a role in maintaining your nerve cells, helping them work properly and keeping your brain sharp
Either fits comfortably within the 28-day stability window
The conversation has moved on significantly in recent years
If you are low in Vitamin B12 or have a deficiency anaemia, you will not be creating enough red blood cells and the ones you do make might be defective, being abnormally large
The standard guideline is a maximum of 28 days after the first puncture
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