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The cheapest insurance against this is buying bacteriostatic water from a source that can confirm what's actually in the bottle manufacturer name, lot number, USP labeling, glass vial with metal-crimp seal, and the explicit "0.9% benzyl alcohol" line

Keep the vial protected from direct light

In NMR analysis, amide protons and alpha-carbon environments may produce distinguishable signals consistent with peptide-like frameworks

11(1): e0147034 Resveratrol Protects against TNF--Induced Injury in Human Umbilical Endothelial Cells through Promoting Sirtuin-1-Induced Repression of NF-KB and p38 MAPK Wei Pan, Huizhen Yu, Shujie Huang, and Pengli Zhu Anil Kumar, Editor ~ Gastroenterology