Lyophilized · 20 mL / vial Bacteriostatic Water 20 mL / vial — HPLC-verified peptide vial

Support & Solvents 20 mL / vial

Bacteriostatic Water — 20mL Multi-Use Vial

Q: What is Bacteriostatic Water used for?

Bacteriostatic Water (BAC Water) is the standard solvent for reconstituting lyophilized peptides. The 0.9% benzyl alcohol preservative inhibits microbial growth, allowing the same vial to be punctured multiple times for sequential reconstitutions over up to 28 days.

Q: How long is Bac Water stable after opening?

Once punctured, a Bacteriostatic Water vial is good for up to 28 days at room temperature thanks to the benzyl alcohol preservative. Unpunctured vials are stable at room temperature for the printed expiry (typically 24 months from manufacture).

Q: Is Bac Water the same as sterile water?

No — plain "sterile water for injection" has no preservative and must be discarded after a single use. Bacteriostatic Water contains 0.9% benzyl alcohol which prevents microbial growth in multi-use vials. For peptide reconstitution, always use Bacteriostatic Water unless your specific protocol requires preservative-free water.

Q: How do I store Bacteriostatic Water?

Store the Bacteriostatic Water vial at room temperature, protected from light. No refrigeration needed.

Sterile water + 0.9% benzyl alcohol · Multi-use vial · USP-grade

Reconstitution Sterile

Sterile reconstitution solvent — water for injection preserved with 0.9% benzyl alcohol for repeated multi-use vial access.

CAS Number: —
Molecular Weight: —
Purity: USP-grade sterile
Storage: −20 °C, lyophilized

Amino Acid Sequence Sterile water for injection + 0.9% benzyl alcohol (preservative)

Choose your bundle

1 vial $14 /vial $14 total Most popular 3 vials $10 /vial $30 total Best value 10 vials $7 /vial $70 total

Free over $59$7.99 to US (48h) · $14.99 worldwide (5 business days)

Discreet PackagingPlain insulated mailer, no compound name on the outside.

Certificate of Analysis

Per-lot analytical report — HPLC, ESI-MS, LAL endotoxin, heavy metals, sterility

Current lotBAC913

Released2026-04-10

HPLC purity99.11%

Endotoxin (LAL)Pass · < 0.5 EU/mg

Read Full COA View All Lab Results

About Bacteriostatic Water

Buy Bacteriostatic Water 20mL at IGF1 Shop. Bacteriostatic water is sterile water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. The preservative inhibits microbial growth in multi-use vials, allowing repeated access for up to 28 days after first puncture. The standard solvent for reconstituting lyophilized peptides — USP-grade sterile.

Also known as: Bacteriostatic Water · Bac Water · BAC Water · Sterile water for injection

Bacteriostatic Water — Mechanism & Specifications

Bacteriostatic water is sterile water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. The preservative inhibits microbial growth in multi-use vials, allowing repeated access for up to 28 days after first puncture. The standard solvent for reconstituting lyophilized peptides.

Quality & release criteria

Every lot of Bacteriostatic Water is released only after passing reverse-phase HPLC (≥ 99% area purity at 220 nm against a reference standard), ESI mass spectrometry confirmation of molecular weight, and Limulus Amebocyte Lysate (LAL) endotoxin testing below 0.5 EU/mg. The lot-specific Certificate of Analysis is provided with the order and available on request before purchase.

FAQ

Bacteriostatic Water — Frequently asked questions

What is Bacteriostatic Water used for?

Bacteriostatic Water (BAC Water) is the standard solvent for reconstituting lyophilized peptides. The 0.9% benzyl alcohol preservative inhibits microbial growth, allowing the same vial to be punctured multiple times for sequential reconstitutions over up to 28 days.

How long is Bac Water stable after opening?

Once punctured, a Bacteriostatic Water vial is good for up to 28 days at room temperature thanks to the benzyl alcohol preservative. Unpunctured vials are stable at room temperature for the printed expiry (typically 24 months from manufacture).

Is Bac Water the same as sterile water?

No — plain "sterile water for injection" has no preservative and must be discarded after a single use. Bacteriostatic Water contains 0.9% benzyl alcohol which prevents microbial growth in multi-use vials. For peptide reconstitution, always use Bacteriostatic Water unless your specific protocol requires preservative-free water.

How do I store Bacteriostatic Water?

Store the Bacteriostatic Water vial at room temperature, protected from light. No refrigeration needed.