Bacteriostatic Water: Complete Guide for Researchers
Bacteriostatic water (BAC water) is the standard solvent for reconstituting research peptides. Understanding its properties and proper use is essential for peptide research.
What is Bacteriostatic Water?
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits bacterial growth, making the solution safe for multi-dose vial use over extended periods. This distinguishes it from sterile water (no preservative, single-use only).
Why Use BAC Water for Peptides?
Multi-use safety: The preservative allows repeated needle punctures without bacterial contamination risk. pH appropriate: BAC water maintains a neutral pH suitable for most peptides. Compatibility: Compatible with virtually all research peptides. Shelf life: Extends the usable life of reconstituted peptides to 3-4 weeks.
BAC Water vs Sterile Water vs Saline
BAC water: Best for peptides — multi-use preservative, 3-4 week reconstituted shelf life. Sterile water: No preservative, single-use only — reconstituted peptides must be used immediately. Normal saline (0.9% NaCl): Sometimes used but adds unnecessary sodium. BAC water is the standard recommendation for peptide reconstitution.
Proper Use
Store at room temperature before use. Swab the vial top with alcohol before each withdrawal. Use a fresh syringe each time. Discard 28 days after first puncture even if solution remains. See our mixing guide for reconstitution instructions.
Related Articles: How to Mix Peptides | How Much BAC Water | Reconstitution Calculator
For research use only. Shop bacteriostatic water and research peptides at Proxiva Labs.