do b12 injections cause headaches Why I feel worse after a injection? b12 injections cause diarrhea Do

Some patients feel as though they want more frequent injections, and occasionally we test levels to see if they are receiving adequate replacement, but Im not sure how strong the evidence is to support this. GPs should consider periodic vitamin B12 testing of higher-risk patients who take metformin, even if they dont display symptoms of deficiency, the UK medicines regulator said earlier this year

Malabsorption can cause severe B12 deficiency

The exact dose depends on the patients B12 levels, any health issues, and how well they respond to treatment

You can get Vitamin B12 shots in three ways: intramuscularly (IM), subcutaneously, or intravenously (IV)

It depends on how bad your deficiency is and how you react to treatment