b12 injection process first time Will my Work Right Away? How Fast Do B12 Injections

When this vitamin is deficient, the transmission of nerve impulses is impaired

[DOI] [PMC free article] [PubMed] [Google Scholar] 343.Ma, R

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Vitamin B12 deficiency has been linked to fatigue, tingling or loss of feeling in the extremities, irritability, memory impairment, depression, anemia, irritable bowel syndrome (IBS), constipation, poor wound healing, dry or damaged looking skin, and neurological disorders

A B12 injection goes straight into the muscle, so your body gets what it needs fast

So...your IBS is a likley cause of both your vitamin B12 and iron deficiencies