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The person would see the results of vitamin B12 after 1 to 3 days of administration
The buttock: Your upper outer buttocks, or Dorsogluteals, on either side of your body, are common injection sites
This keeps B12 levels just right
Factors Influencing the Effectiveness of Vitamin B12 Shots Several factors can influence how quickly and effectively a Vitamin B12 shot works: Severity of Deficiency : Individuals with severe Vitamin B12 deficiency may experience a more noticeable and rapid improvement in symptoms compared to those with mild deficiency
The NHS treatment pathway and the 2024 NICE guideline both assume B12 injections are given in a clinical setting against a confirmed deficiency, not self-sourced and self-administered
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