Available: Xie, N., Zhang, L., Gao, W., Huang, C., Huber, P.E., Zhou, X., Li, C., Shen, G., Zou, Bingwen, NAD+ metabolism: pathophysiologic mechanisms and therapeutic potential, Signal Transduction and Targeted Therapy
When B12 levels are low, symptoms like brain fog, irritability, low mood, and difficulty concentrating often follow
Currently, there is no practical way to measure individual NNMT activity to predict response
They fall instead under the general remit of the Human Medicines Regulations 2012, which is why unlicensed injectable preparations cannot lawfully be supplied for human administration regardless of "research use only" labelling [3][4]