b12 drops vs injection Shots vs. IV Infusions: What is the difference? B12 Injections vs Pills: Richmond's

Selective Inhibitor Small Molecule Salvage Pathway Published Studies Selective and potent inhibition of nicotinamide N-methyltransferase 5-Amino-1MQ has been shown to inhibit NNMT with high selectivity, leading to increased intracellular NAD+ levels and SAM (S-adenosylmethionine) concentrations in adipose tissue

Exceeding common ranges without strong scientific justification is generally discouraged in responsible research

But not for the reason most people think

Mild soreness at the site for a day or two afterwards is normal and feels similar to the morning after a tetanus or flu jab

Vitamin B12 and Nerve Pain: The Connection When B12 levels dip, myelin production can be impaired

PMID 14527323