⚠️ For Research Use Only (RUO). Not for human or animal use.
If you’ve looked at the label on a bottle of bacteriostatic water, you’ve probably noticed it contains 0.9% benzyl alcohol. But what does that actually do — and why does it matter?
What Is Benzyl Alcohol?
Benzyl alcohol is a mild preservative that has been used in laboratory and pharmaceutical settings for decades. In bacteriostatic water, it serves one specific purpose: to stop bacteria from growing inside the vial.
Without it, any bacteria that enter the vial — even from a needle tip — could multiply rapidly. With it, bacterial growth is inhibited, keeping the solution stable across multiple uses.
Why Does This Matter?
The key benefit is simple: you can use the same vial multiple times.
Plain sterile water has no preservative, so once you access the vial, contamination risk increases with every subsequent use. Bacteriostatic water with benzyl alcohol stays protected, making it the practical choice for research protocols that require repeated transfers from the same vial.
At a Glance
| BAC Water (0.9% Benzyl Alcohol) | Plain Sterile Water | |
|---|---|---|
| Preservative | Yes | No |
| Multi-use from same vial | ✅ Yes | ❌ Not recommended |
| Contamination protection | High | Low after first access |
Is Benzyl Alcohol Right for Your Application?
For most standard research peptides, yes. However, some compounds — particularly certain growth factors — may be sensitive to benzyl alcohol. Always check your peptide supplier’s technical documentation before choosing your reconstitution solvent.
For a full comparison, see: Bacteriostatic Water vs Sterile Water.
⚠️ Disclaimer
Insulfine BAC Water is for Research Use Only (RUO). Not intended for human or animal use. Follow your institution’s safety guidelines.
Shop Insulfine BAC Water
0.9% benzyl alcohol, sterile, available in 10 mL and 30 mL sizes. Ships from US warehouse. COA available on request.
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