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The sensation, sometimes described as a tightness, fullness, or like something is stuck behind the breastbone, can be temporary or persistent, painless or accompanied by other symptoms

The injection can be given intramuscularly or intravenously, depending on the doctor's advice and the selected injection site

Different reconstitution times mean different expiration windows

Others who might be prescribed B12 shots are those at the highest risk for a B12 deficiency, including: Vegans, since vitamin B12 is found only in animal products People ages 60 and up since their bodies don't absorb B12 as efficiently People with Crohn's disease or pancreatic disease, since they prevent nutrient absorption People who had weight-loss surgery, which decreases B12 absorption People with an eating disorder People with HIV People with diabetes Since a mild B12 deficiency might not cause symptoms, it can go undetected for years since levels are not checked during routine blood work

Local Reactions: Injection Site Reactions : Mild irritation, redness, or swelling at the subcutaneous injection site