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Possible side effects include: Pain or redness at the injection site Mild nausea Headache Dizziness Skin rash Allergic reactions (rare) Seek immediate medical attention if you experience swelling, difficulty breathing, or other signs of a severe allergic reaction
Vitamin B12 injection dosage for adults Your provider sets your dose based on the reason for treatment, your current blood levels, and the form prescribed
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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