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Description
The primary safety concerns include immunogenicity (development of antidrug antibodies), gastrointestinal reactions, and contamination risks in unregulated products

A standard B12 injection focuses on vitamin B12

Subcutaneous administration of vitamin B12 is sometimes employed, especially in patients with congenital cobalamin metabolism disorders who require high doses to maintain normal metabolic pathways

doi:10.21037/cdt.2017.09.12 Li R, Yuan M, Yu S, et al

Do those who choose alternative cancer treatments live longer
