In the world of performance enhancement, proper reconstitution of peptides and hormones is non-negotiable. The single most important supply (after the compounds themselves) is high-quality Bacteriostatic Water. Â What Is Bacteriostatic Water and Why Is It Essential? Â Bacteriostatic Water is sterile water that contains 0.9% benzyl alcohol as a preservative. This gentle bacteriostatic agent prevents the growth of bacteria for up to 28 days after the vial is opened, making it t