Reference ranges, units, and the absence of a universal upper limit There is no single number that defines a high B12
J Neurol Neurosurg Psychiatry 66:431435 Karnik V, Farcy N, Zamorano C, Bruno V (2020) Current status of pain management in Parkinsons disease
Pediatric Use Safety and effectiveness in pediatric patients has not been established
At the molecular level, 5-amino-1MQ functions as a competitive inhibitor of NNMT, demonstrating remarkable potency with an IC of 1.2 0.1 M under standard assay conditions (50 M SAM, 100 M nicotinic acid). This represents a dramatic 10-fold improvement over the parent compound 1-methylquinolinium, achieved through strategic amino group substitution that enhances binding affinity to the NNMT active site. The compound's mechanism centers on preventing the methylation of nicotinamide to 1-methylnicotinamide (1-MNA), thereby preserving nicotinamide for recycling back to NAD+ through the salvage pathway. This intervention effectively blocks what researchers have termed the "NNMT metabolic drain" a process that simultaneously depletes NAD+ precursors and consumes cellular methylation capacity
Given that B12 is prevalent in meat, fish, and dairy products, people who keep a vegan diet often do not have a natural way to get their daily dose of B12
Injection delivery is the only reliable way to maintain therapeutic levels for patients with absorption issues or rapid elimination
