lump at injection site after b12 shot Subcutaneous Injection: What It Is and How to Give One What happens if you inject

The most common causes include B12 supplementation (particularly injections), liver disease releasing stored B12, haematological disorders increasing B12-binding proteins, and chronic kidney disease reducing B12 excretion

But unless you have a vitamin B12 deficiency, vitamin B12 injections aren't likely to give you an energy boost." Ironically, the National Institutes of Health says that symptoms of B12 deficiency include loss of appetite and weight loss

This response affects some patients and can manifest in various ways, from fatigue to physical discomfort

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Adults usually getvitamin B12 injections in doses of 1000 mcg, based on the deficiency level