Bacteriostatic water (BAC water) is one of the most important supplies for anyone working with lyophilized peptides. Here's what it is, why it matters, and how it affects how you store your compounds.
What Is Bacteriostatic Water?
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth. This allows a single vial to be used for multiple draws over 28-30 days without contamination — unlike sterile water, which should ideally be used in single doses.
BAC Water vs Sterile Water for Peptides
BAC water: multi-dose use up to 28-30 days, has preservative, best for daily/frequent protocols. Sterile water: single draw ideal, no preservative, best for single-dose vials.
Storage After Reconstitution
Once reconstituted with BAC water, store vials refrigerated at 2-8°C in a VialLock hard-shell case to protect against light and physical damage. Browse VialLock vial cases.