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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 appropriate amount, delivery method and cycle length depend on the treatment goal, medical history, product concentration and provider guidance
As a result, B12 injections give new life to PA patients who would otherwise decline day after day until the disease killed them
A Certificate of Analysis (COA) is available for every batch
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