It plays a vital role in the healthy functioning of many systems in the body, including the following: DNA (genetic material) synthesis Energy production (metabolism) Nerve cell health Neurological (brain) function Red blood cell (hemoglobin) formation Vitamin B12 plays a key role in the normal functioning of the brain and nervous system
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While you can, it should be mentioned that sterile water used for injection is different than sterile water used for washing, cleaning, or irrigation
Shruti Tanwar, MBBS, MS (Obstetrics & Gynecology), aligned with WHO, NHS and FOGSI guidance Last updated: 20 July 2026 Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice
Doctors watch for signs like more energy and better test results to see if the dose is right