b12 1 mg injection Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL Vitamin B Vitamin B12 Injection – Manufacturer

So, it may play a role in conditions such as Alzheimer's disease and stroke

Additionally, electrophysiological experiments have shown the direct effects of B vitamins on pain transmission pathways in the spinal cord and thalamus, which explains the observed reduction or loss of pain sensation in clinical patients

GIP receptor activation adds something unique

So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change

This reduces pain and can improve motor function and balance

B12 injections work quickly and typically show noticeable effects within 48 to 72 hours