side effects of b12 injections in humans What Does a Shot Do for You? Vitamin B12 Deficiency Vitamin B12: Overdose and Side

Injection site reactions including temporary redness, swelling, or discomfort occur occasionally

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Many clients appreciate that results can often be felt within hours to days, with effects lasting for several weeks

Risk factors that should prompt consideration of B12 deficiency include advancing age (reduced stomach acid production), strict vegan or vegetarian diets, pernicious anaemia, gastrointestinal surgery (particularly gastric bypass or ileal resection), long-term use of certain medications (metformin, proton pump inhibitors, H2-receptor antagonists), nitrous oxide exposure (including recreational use), and conditions affecting the gut such as Crohn's disease or coeliac disease

Injection Process The B12 injection is quick and relatively painless, typically administered in the arm or hip

reduced metabolic rate