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Factors such as initial B12 levels, underlying medical conditions, certain medications, advanced age, and injection frequency can affect the absorption and utilization of B12, possibly shortening the duration of action
they make use of supplements like Vitamin B-12 injections
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Infections and acute illnesses , including viral gastroenteritis, food poisoning, or antibiotic-associated diarrhoea, may coincidentally occur when someone has recently started B12 supplementation
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