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Further assessments are needed to evaluate potential liver damage if the virus is found
For brand-name pens: Manufacturer expiration dates allow longer storage, typically 18 to 24 months from manufacturing
Most people having B12 injections (intramuscular) will see an improvement in the first 24 hours, but the hematological response, including the quick production of new red blood cells, may take several days to months for a full response
A designated amount will be injected into the gluteus
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Measurable body composition changes usually become apparent by weeks 2-4, with progressive improvements continuing through weeks 4-12 of consistent use
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