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Using sterile water for multi-dose vials introduces contamination risk with every needle puncture

Injecting B12 into fat means placing the vitamin into the subcutaneous layer, the soft fatty tissue that sits between your skin and your muscle

People who take certain medications may also be at risk of vitamin B12 deficiency, including, but not limited to, estrogen, H2 receptor antagonists, PPIs (Proton Pump Inhibitors), Chloramphenicol, and Metformin