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Certain plant foods contain vitamin B12 as well, including nori (a type of dried seaweed) and dried shiitake mushrooms

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)

Even at low doses, it can sometimes cause swelling, dizziness or unwanted hair growth on the face or body

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