arm hurts after b12 injection Why do I feel worse a injection? Why your arm might be

Suppose vitamin B12 levels in a person are too low because of a health condition

People with the following should discuss risks carefully with a medical professional: Liver disease Kidney disease Pernicious anemia Known allergies to any ingredient in the formulation Pregnancy or breastfeeding (safety not well-studied avoid unless prescribed) Because ingredients differ between providers, always verify the formulation and follow prescribed dosing to minimize risk

Check packaging container for expiration and also inspect formulation that either it is showing signs of expiration or not

Many experienced users report optimal outcomes in the 0.25mg to 0.5mg range, with diminishing returns above that level