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Vitamin B12 is water-soluble, meaning your body will typically eliminate any excess through urine

I feel like although the earlier commenters made it out like it's so 'uncommon', it's not at all

Functional and structural data indicate that the promoter region of the human CD38 gene, located at chromosome 4, is regulated by several factors including NF-B, RR, LR, and STAT [38-39, 52]

Improved Mood and Mental Clarity: Supports neurotransmitter function

Learn where to self-administer a B12 shot and how to do it painlessly This article was medically reviewed by Shari Forschen, NP, MA and by wikiHow staff writer, Amber Crain