vitamin b12 injection st catharines B-12 Injectable Solution Vitamin B12 is not made by the body and is provided either by diet or supplementation Vitamin B12 Injection Service |
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I feel like although the earlier commenters made it out like it's so 'uncommon', it's not at all

doi: 10.1016/j.tem.2017.02.004 4 HongSMoreno-NavarreteJMWeiXKikukawaYTzameliIPrasadDet al

Vitamin B12 is usually prescribed as a supplement to treat nerve damage due to its ability to preserve healthy nerve cells

Usually, 1000 mcg (1 mg) is given, but it might be adjusted for each person