disadvantages of b12 injections Efficacy different routes of vitamin supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis Vitamin B12 Injection Side Effects
Description
When Injections Are Medically Indicated People with certain issues might need B12 injections

NNMT inhibition increases intracellular NAD+ by blocking nicotinamide methylation, but the long-term metabolic consequences of sustained NNMT suppression

Individual results may vary.

That process is slow, and for some people it is not very efficient

[DOI] [PMC free article] [PubMed] [Google Scholar] 19.Shpilka, T