is b12 injection better than pill Vitamin Injections vs. Supplements: Which Works Best? Still taking vitamin B12 injections?

So yeah, talk to your doctor first

Its likewise crucial to note that, as with any supplement, especially one that is relatively new and not extensively studied, caution must be exercised regarding its use

How This Works 5-Amino-1MQ (5-amino-1-methylquinolinium) is a synthetic small molecule not a peptide that selectively inhibits nicotinamide N-methyltransferase (NNMT) [1]

Epigenetic and Cellular Reprogramming: By blocking NNMT-mediated methylation of nicotinamide, preserves NAD salvage pathway activity, increases SIRT-1 signaling, reduces histone deacetylation, and promotes metabolic reprogramming toward oxidative phosphorylation and glycolysis balance, supporting tissue repair and energy homeostasis 1-4

Nature, 2014