how soon after b12 injection feel better do you less tired a injection? Why do I feel worse

10.7860/JCDR/2022/53256.16055 48 Sanz-CuestaT.Escortell-MayorE.Cura-GonzalezI.Martin-FernandezJ.Riesgo-FuertesR.Garrido-ElustondoS.et al (2020)

Who Benefits Most From IV Infusions for Severe Deficiency

If a client has a vitamin B12 deficiency, they might benefit from an injection

For individuals requiring supplementation due to confirmed deficiency or malabsorption, therapeutic doses vary considerably depending on the underlying cause: Dietary deficiency : 50150 micrograms daily orally, or cyanocobalamin tablets as prescribed Pernicious anaemia : Initially hydroxocobalamin 1 mg intramuscularly three times weekly for two weeks, then maintenance injections every two to three months [3] Neurological involvement : More intensive regimens may be required, with hydroxocobalamin injections on alternate days until symptom improvement [3] NICE guidance emphasises that supplementation should be evidence-based rather than speculative

But, how often depends on how bad the deficiency is and how well theyre doing