b12 injectable amazon Vitamin Injections neurobion vitamin b12 injection Amazon.com:

Consult directly here Medication is dispensed at your chosen pharmacy (cost not included) Vitamin B12 is a crucial nutrient that aids in the production of red blood cells and DNA

Loss of NAD homeostasis leads to progressive and reversible degeneration of skeletal muscle

Also - and I feel quite exasperated with your GP - he should be treating your symptoms (ongoing and some quite worrying), not just looking at your blood results

It may be that having this regime would have a beneficial impact on your trigeminal neuralgia - neurological symptoms take some time to repair properly and having the loading doses then (I suspect) the 'usual' three monthly jabs may not be sufficient to effect proper neurological repair