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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
Verify pharmacies using the General Pharmaceutical Council (GPhC) online register before purchasing any medicine
These are very effective at raising blood levels of B12 and preventing/reversing a deficiency
The lower the gauge number, the thicker the needle
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