Bacteriostatic water, often referred to as “bac water,” is a sterile, non-pyrogenic solution containing 0.9% benzyl alcohol, which serves as a preservative to prevent bacterial growth. It is formulated for the dilution or reconstitution of medications, particularly lyophilized freeze-dried peptides, prior to injection. The inclusion of benzyl alcohol enables the solution to remain sterile for multiple uses typically up to 28 days after the first puncture, unlike sterile water, which must be discarded after a single use. Bacteriostatic water is widely utilized in research and clinical environments to prepare compounds such as growth hormone fragments, GHRH analogs, and other injectable substances. Its ability to maintain sterility over time makes it a vital component for ensuring safe, controlled, and repeated administration when stored and handled correctly. For research use only. Not intended for human consumption, medical, diagnostic, or therapeutic purposes.