Pfizer Hospira Bacteriostatic Water 30 mL Peptide Test BAC Water 10ML Nuvia Peptides Bacteriostatic Water Injection, Multiple Dose Vial 30 mL McGuff How to Store Bacteriostatic Water Safely Confused about whether BAC water needs refrigeration after opening? According to USP standards and Pfizer's own guidance, both room temp (2025C) and refrigeration are acceptable Hospira BAC water is designed specifically for reconstituting peptides. The bacteriostatic agent (0.9% benzyl alcohol) helps inhibit bacterial growth, allowing for safe multi dose use. Quality matters here. Using a trusted, medical grade product