b12 prefilled injection PureLabs RX Bac Water 3mL Unlabeled Bac Water 3mL 10

This is not FDA-approved

It contains a bacteriostatic preservative that helps inhibit the growth of bacteria after the vial has been opened, making it suitable for repeated laboratory use under controlled research conditions

Kannt A, Pfenninger A, Teichert L, Tnjes A, Dietrich A, Schn MR, Klting N, Blher M. Association of nicotinamide-N-methyltransferase mRNA expression in human adipose tissue and the plasma concentration of its product, 1-methylnicotinamide, with insulin resistance. Diabetologia. 2015 Apr;58(4):799-808. doi: 10.1007/s00125-014-3490-7. Epub 2015 Jan 18. PMID: 25596852; PMCID: PMC4351435

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If someone is deficient in vitamin B12, they will become quite large and acquire an oval shape