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contraindications to b12 injections What You Need Know About Vitamin Vitamin B12 - PMC
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doi:10.1152/physrev.1998.78.2.393

Science 350 , 12081213 (2015)

Further Reading For additional peer-reviewed research, see: NNMT inhibitor preclinical study by Neelakantan et al

Research indicates it does not significantly impact insulin or IGF-1 levels, and it has not been shown to trigger antibody formation
