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Seiwerth et al., 2018
(2026) Zhu et al
You might experience minor redness, swelling, or tenderness at the injection site, but these will typically resolve within a day or two
IM Vitamin B12 injections work faster and more reliably, making them ideal for fatigue recovery, athletes and individuals with malabsorption
During therapy, B12 levels may rebound quickly after injections, but functional markers like MMA and homocysteine can reveal whether tissue-level B12 status is truly improving
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