Vitamin B-Complex Injection can be given either intramuscularly (IM), usually into a large muscle like the upper outer buttock (gluteal muscle) or thigh, subcutaneously (SQ) or sometimes intravenously (IV) as a slow injection in a clinical setting
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The needle you have now hurts too much or is too long
A significant sign that the injections are working is a reduction in symptoms of vitamin B12 deficiency, such as weakness, rapid heart rate, easy bruising or bleeding, and pale skin
[1] [2] Hydroxocobalamin is a prescription-only medicine (POM) that should be administered by appropriately trained healthcare professionals, typically following a standard regimen of loading doses (e.g., 1mg on alternate days for 1-2 weeks) followed by maintenance doses (1mg every 2-3 months, or every 2 months if neurological symptoms are present)
Clinical Trials: Impact of B12 Supplementation on Metabolites Serum B12 Holotranscobalamin Methylmalonic Acid Homocysteine Notes on Clinical Trials of B12 Supplementation Appendix C