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doi: 10.1210/EN.2015-1308

[DOI] [PubMed] [Google Scholar] 126.Sikiri P., Seiwerth S., Grabarevi Z., Rucman R., Petek M., Jagi V., Turkovi B., Rotkvi I., Mise S., Zorici I., et al

Intramuscular injection is the most common method, where we inject the vitamin directly into a muscle, usually in your upper arm or buttock

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This may require more frequent injections to get the weekly dose you need

When there is less B12 in your body than required, it slows down cell division, which ultimately disrupts hair production
