injecting b12 into fat fat: 4 body areas that work best Best Vitamin B12 Injection Site:

Be extremely careful around eyes

As of June 5, 2026, practices have 26 days to audit CPT 20610 code-pair combinations against the Q3 2026 edit file before the new restrictions take effect

Edward Rubin, MD board-certified in Pain Medicine and Anesthesiology, with fellowship training at Cornell, Columbia, Hospital for Special Surgery, and Memorial Sloan Kettering

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Vitamin B12 deficiency If left untreated, vitamin B deficiency can harm your brain and nervous system, leading to issues such as: Incontinence (not being able to control your pee or poop) Nerve issues, such as numbness, weakness, or nerve pain Erectile dysfunction (not being able to get an erect penis) Paralysis (not being able to move your body) Memory loss Paranoia (feeling like others are trying to hurt you) If you dont have symptoms but are at risk of low B12 levels, your doctor might also want you to have regular tests