side affects of too much b12 injections Feeling worse after Injection: Answering concerns Are There Any Side Effects
Description
A healthy body needs Vitamin B12 to produce healthy red blood cells that can take oxygenated blood around the body and keep the central nervous system functioning correctly

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Intestinal absorption of water-soluble vitamins: An update

Hydroxocobalamin | Drugs BNF NICE

I agree with @Nackapan

Patients should expect to be a little red after the procedure, but this usually resolves in about an hour or so
