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This is often called a loading dose phase, and its purpose is to quickly raise the B12 levels in your body and help you start feeling better
Last reviewed: November 16, 2025 The timing of CDC-recommended vaccination is unaffected by the receipt of COVID-19 monoclonal antibodies or convalescent plasma
Different manufacturers can specify slightly different conditions
An intramuscular injection can last up to a month and is absorbed slowly into the blood over a longer period
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