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People with vitamin B12 deficiency may feel tired and lethargic and have decreased physical energy
It is important to check for coexistent folate and iron deficiency
Vitamin B12 shots are typically given intramuscularlymeaning the injection is delivered directly into a muscle, most often in the upper arm (deltoid), thigh, or buttock
Neelakantan, H., Brightwell, C
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It is important to note that all current evidence derives from in vitro cellular models and in vivo animal studies, and no human clinical trials have been conducted as of February 2026
The injection provides a direct way to restore key nutrients and can help patients feel more balanced, energized, and revitalized as part of a broader approach to wellness and body function
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