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Less common B12 shot side effects include : Chest tightness Skin rash or hives Dizziness Difficulty breathing A blue tint to the skin Call your doc ASAP if you notice any of these negative effects

This can be due to having low levels of intrinsic factor in the digestive system, having a digestive condition, or following a plant-based diet

Gastrointestinal conditions Some gastrointestinal conditions may affect how vitamin B12 is digested or absorbed, such as: history of gastrointestinal surgery celiac disease Crohns disease pernicious anemia infections, such as from Helicobacter pylori bacteria or parasites pancreatic insufficiency or cancer bowel cancer folic acid deficiency small intestinal bacterial overgrowth Vitamin B12 injections may be more helpful for people with gastrointestinal conditions than oral products

In brief, the blood samples were mixed with 50% (v/v) RPMI 1640 medium (Sigma-Aldrich, Saint Louis, Missouri)

Testing your B12 levels provides our medical professionals with a clear, data-driven baseline of your overall health: Identifying Deficiencies: Blood tests reveal the exact severity of your B12 deficiency