vitamin b1 b2 b6 b12 injection Contains 100mg per mL of both Thiamine (B1) and Niacin. Optineuron Injection - N Chimanlal
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But we don't live in the historical world anymore
doi: 10.1016/j.pharmthera.2016.12.002

A U-100 insulin syringe with half-unit or fine gradations makes this dose far easier to measure accurately than a standard 1 mL syringe

[DOI] [PubMed] [Google Scholar] 19.Hampel D, Shahab-Ferdows S, Domek JM, Siddiqua T, Raqib R, Allen LH

The maximum approved dose produces the greatest weight loss in clinical trials but also the highest side effect incidence