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Anyone with serious medical conditions should discuss risks with their physician before starting treatment
Drink plenty of water to prevent your mouth becoming dry
NICE Clinical Knowledge Summaries and British Society for Haematology guidelines emphasise the importance of prompt investigation when clinical features suggest deficiency
B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers
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