Concentration accuracy is harder than it looks The 0.9% benzyl alcohol target is a narrow window with consequences on both sides: Too little benzyl alcohol (below ~0.5%) and the bacteriostatic effect weakens significantly, allowing bacterial growth in the multi-dose vial during the 28-day use window Too much benzyl alcohol (above ~2%) and tissue toxicity becomes a concern published research has documented injection site irritation, tissue damage, and in extreme concentrations, systemic toxicity from benzyl alcohol exposure For a 30 mL batch, the target benzyl alcohol volume is 0.27 mL roughly five drops from a standard dropper
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10.1007/s00268-012-1663-4 [DOI] [PMC free article] [PubMed] [Google Scholar] Vukojevic J., Siroglavic M., Kasnik K., Kralj T., Stancic D., Kokot A., et al
Overall, there is evidence that T cells are important in early viral control and infection blockade , thus providing support for the inclusion of T-cell antigens within next-generation vaccines alongside B-cell antigens
The answer has almost nothing to do with science and almost everything to do with the bureaucratic weirdness of compounding laws
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