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The longevity of the fillers depends on the type used and individual factors, typically ranging from 6 to 12 months

The following table summarizes common claims and their evidence basis: The key pattern: most benefits are real only for individuals who are actually deficient in B12

Improves Energy Levels Low vitamin B12 reduces oxygen delivery to muscles and organs, causing constant tiredness

The most common side effect of B12 injections is irritation at the injection site, and injections are typically administered intramuscularly or subcutaneously. Less common side effects may include headache, nausea, diarrhea, itching, or a brief feeling of lightheadedness after the injection