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There are different uses and indications for each of these forms
Administer the injection at the same time each week
Frequent infections: These can also be symptoms of a vitamin B12 deficiency and may be accompanied by lightheadedness
A vitamin B12 injection delivers the vitamin directly into your muscle
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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)
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