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Common causes include: Pernicious anemia, an autoimmune disorder hindering Vitamin B12 absorption Gastrointestinal surgeries, like gastrectomy, impact Vitamin B12 uptake Long-term use of certain medications, such as metformin or proton pump inhibitors Diets lacking in Vitamin B12, often seen in vegans and vegetarians For those without a deficiency, Vitamin B12 injections are not typically recommended, as their body can naturally regulate and excrete excess amounts of the vitamin

If you are considering trying B12 injections, it is important to speak with a healthcare professional to determine if they are right for you

doi: 10.1038/ejcn.2014.165

Presented for research literature review only Materon EM et al

The advantage is minimal injection volume