Are 6.5 nM for NE, 8.2 nM for DA, and 11.6 nM for 5-HT
How Often Should Individuals Receive B12 IM Injections
Intramuscular: These injections are more common, as they tend to have better results
Unexplained hypercobalaminemia, particularly levels above 1,000 pg/mL, has been associated with liver disease, kidney dysfunction, myeloproliferative disorders, and certain solid cancers in multiple large-scale studies
The injection might cause a brief pinch or discomfort, but it is generally well-tolerated
If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again