can you inject b12 with insulin needle Dr. prescribed injections. Pharmacy only gave me vials. Where do get your needles and syringes? What size?? Where do I inject? : r/B12_Deficiency B12 Shots at Home: How,

PMID 17959839

This 10mg lyophilized vial is designed for controlled laboratory environments where precision, purity, and reproducibility are essential for meaningful data generation.5-AMINO 1MQ 10mg Vial (Research Use Only) is widely studied in vitro and in preclinical research models for its role as a nicotinamide N-methyltransferase (NNMT) pathway inhibitor, making it a compelling compound for research into metabolic signaling, adipocyte biology, and NAD-related cellular processes

"Anaerobic synthesis of vitamin B12: characterization of the early steps in the pathway" (PDF)

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This means that if you take more than you need, the excess will be excreted through your urine