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can you inject vitamin b12 yourself How to Give a Injection How To Self-Inject B12
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Rapid injection increases discomfort and may cause the medication to leak back out of the injection site

Babula JJ, Bui D, Stevenson HL, Watowich SJ, Neelakantan H
A patient with B12 deficiency following Roux-en-Y gastric bypass receives D51.8 because the small intestine cannot properly absorb B12 despite adequate intrinsic factor production

you do not have enough oxygen

Higgins JPT, Thomas J, Chandler J et al (2021) Cochrane handbook for systematic reviews of interventions version 6.2 Sterne JAC, Savovi J, Page MJ et al (2019) RoB 2: a revised tool for assessing risk of bias in randomized trials
