how long does b12 injection stay in your system a Shot Last? Duration, Benefits & Timing B12 Shots vs. IV Infusions:

Fortunately, there is increasing evidence that oral B12 supplements are just as good as injections for raising blood levels in most people ( Vegetarians and vegans are usually advised to take at least 10 mcg per day, or at least 2,000 mcg once per week ( However, some doctors still prefer the use of injections

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Oral route of vitamin B12 administration: In the case of vitamin B12 malabsorption, irrespective of the cause of malabsorption, the intramuscular route is preferred

This duration balances therapeutic benefits with manageable treatment commitment and cost considerations

Vitamin B12 given as hydroxocobalamin is usually intended for the muscle, and a needle that is too short can deposit it in the fat layer instead