b12 injections 6 in 2 weeks Vitamin shots: Uses, benefits, and side effects How Long Does a Vitamin

Designed for researchers investigating advanced cellular pathways, this formulation features 5-Amino-1-methylquinolinium, a potent small molecule inhibitor of the enzyme Nicotinamide N-methyltransferase (NNMT)

Contraindications and Special Populations Some people should be careful or not get B12 injections at all

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Can Vitamin B12 Cause Gas

A total of 14 years in dedicated schooling and medical residency

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