reason for b12 injections Vitamin Injection Dosage B12 Shots: Vitamin B12 Injections

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