The difference in one line
Sterile water is clean once — the first needle through the stopper ends that. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth inside the vial, making it suitable for multi-draw use over the research window.
Why it matters for peptides
Reconstituted peptide vials are used across days or weeks, not in one sitting. Each draw introduces potential contamination; without a bacteriostatic agent the solution becomes unusable within days. With BAC water, refrigerated solutions remain viable for the standard ~4 week window.
| Sterile water | Bacteriostatic water | |
|---|---|---|
| Preservative | None | 0.9% benzyl alcohol |
| Multi-use vial | No | Yes |
| Refrigerated life after mixing | Days | ~4 weeks |
Ours ships free with bundles
Every Vital Biotech bundle includes BAC water matched to the number of vials, and it’s available solo as a 3ml vial. If you’re ordering a single peptide, add one — it’s the item nobody realises they need until the powder arrives.