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This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)
The symptoms may be indicative of another problem that vitamin B-12 injections cant treat
If tirzepatide has frozen , do not use it
It is intended to be administered by subcutaneous, intramuscular, or intravenous injection
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