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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
It helps with many body functions, making it vital for our well-being
However, certain drugs may affect how your body uses B12, making injections particularly beneficial
Also discard it if sterility was compromised: unclean septum, reused needle, damaged stopper, or storage outside the documented temperature range
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