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The mice were treated with vitamin B 12 in 0.5 mg/kg or 1.5 mg/kg by intraperitoneal injection from 1 day after injury for 2 consecutive weeks

If you are experiencing hair loss, there are several factors at play

B12 injections deliver vitamin B12 directly into the body to support normal metabolic and neurological function

Self-Injecting Vitamin B12 Shots- Best Body Parts 3- Relax This may be a hard pill to swallow, especially if youre usually nervous about sharp needles, but it really does help to sit in a comfortable position before submitting to a vitamin B12 shot, and force your muscles to relax as the needle goes in and the thick fluid enters your muscular tissue