b12 injections pernicious anemia and Deficiency Vitamin B12 Deficiency: Recognition and

This is the main factor for how long a B12 injection takes to work, offering a significant advantage over oral supplements, which must be broken down by the digestive system before they can be distributed throughout the body

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When deficiency is suspected based on clinical features (fatigue, paraesthesia, cognitive changes) or risk factors (vegan diet, gastric surgery, certain medications), serum B12 measurement guides appropriate intervention

Mild reactions may resolve by discontinuing supplements, while severe symptoms may require medical intervention, such as supportive care or medication