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Intravenous Administration The way B12 injections are given, either intramuscularly or intravenously, affects how well they work
Often, a deficiency happens because your body is unable to absorb vitamin B12 from food
Factors such as body size, metabolism, potential absorption disorders, and dietary intake can influence the frequency and dosage of the shots
This depends on the severity of your deficiency, but many people start with a short loading course followed by maintenance injections every few months
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