does a b12 injection make you tired injections How Soon Do Feel Less After Injection? Benefits of Vitamin B12 Shots – Feeling Tired and Run-Down? B12

Increased Energy Levels: Vitamin B12 plays a crucial role in energy production within the body

Who Benefits Most from Injections People with B12 deficiency, fatigue, or low dietary intake often benefit most

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Other groups who may benefit include: Patients following gastric surgery (gastrectomy, bariatric procedures) where intrinsic factor production or absorption sites are compromised Individuals with malabsorption disorders such as Crohn's disease, coeliac disease, or chronic pancreatitis Strict vegans and vegetarians with dietary insufficiency, though oral supplementation is usually tried first Elderly patients with atrophic gastritis or reduced gastric acid production Patients on long-term metformin or proton pump inhibitors, which can impair B12 absorption [6] [8] Individuals with nitrous oxide exposure (recreational or medical), which can cause functional B12 deficiency Diagnosis typically involves serum B12 measurement, with levels below approximately 148 pmol/L (though thresholds vary between laboratories) generally indicating deficiency