can a b12 injection make you feel sick How Long Does Shot Last In Your Body? Vitamin B12 Supplements and Injections

This is a reasonable characterisation of the current literature, though it should be understood as reflecting early-stage scientific interest rather than established clinical consensus

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Certain individuals are more likely to develop B12 deficiency, including those with: Pernicious anemia Gastrointestinal conditions (such as Crohns disease or celiac disease) A history of gastrointestinal surgery Difficulty absorbing nutrients due to age or other medical conditions For these patients, vitamin B12 injections are an effective option because they deliver the nutrient directly into the bloodstream, bypassing the digestive system and ensuring optimal absorption