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Description
Excess B12 from oral supplements is poorly absorbed at high doses (the body absorbs roughly 1 to 2% of a 1,000 mcg oral dose) and the remainder is excreted in urine

[DOI] [PMC free article] [PubMed] [Google Scholar] 142.Beckman J.S., Koppenol W.H

The decision to get B12 injections should be guided by lab results, honest risk-benefit discussions with a qualified provider, and clarity about whether you are treating a diagnosed deficiency or pursuing an elective wellness service

B12 is added because it directly supports red blood cell formation, neurological function, and steady daily energy
