Severe deficiency: For severe cases, more doses or injections might be needed, even if there are neurological symptoms
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However, always ensure you feel well and capable before engaging in these activities
The biggest single cause in the UK is autoimmune gastritis, the condition older guidance called pernicious anaemia
Zheng Y et al
As we age, our bodies can become less efficient at absorbing vitamin B12 from food, increasing the risk of deficiency