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sick after b12 injection Injections| Norfolk, VA Are B12 Shots Safe? Royal
Description
Rising haemoglobin and normalisation of mean cell volume usually become evident within one to two weeks, with full blood count (FBC) monitoring recommended after approximately 2 weeks and again after 810 weeks to confirm response

References: Cook, A.K

This can be caused by factors such as the size of the needle used, poor visibility during the procedure, and the injection technique employed
Some patients feel it the same afternoon
