how fast is b12 injection absorbed Vitamin A Vitamin B12 a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps How Long Does Vitamin B12
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If you suspect you have experienced a side effect from any medicine or research chemical, you can report it to the MHRA via the Yellow Card Scheme (yellowcard.mhra.gov.uk)

If so, these may be signs of a vitamin B12 deficiency

Do I need any special preparation

At CoLaz we give B12 injections only after a free consultation and only where treatment is appropriate