when is b12 injections needed Would You Need to Get Vitamin Shots? | Ask the Experts | Sharecare Vitamin B12 Injections for Pernicious

The long half-life means you will still have therapeutic drug levels even several days late

Vitamin B12 Injection Duration: 1 to 2 weeks, with some effects lasting up to a month Used for: Boosting energy, supporting red blood cell production, improving nerve health B12 is water-soluble and naturally eliminated through urine, so regular injections may be needed, especially if you have a deficiency or absorption issue (e.g., pernicious anemia or gastrointestinal disorders)

B12 shots are a method of delivering this essential vitamin directly into your bloodstream through a quick and virtually painless injection into a muscle

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These can also be present in people who do not have PA