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Using alcohol swabs on vial tops, never touching needle tips, and avoiding multi-use of single-use components maintains safety

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 segment on oxidized glutathione (GSSG) is pushed by its importance as an indicator of cellular damage and oxidative stress