What is the half-life of Bacteriostatic Water (BAC Water)?

Bacteriostatic Water (BAC Water) has a half-life of Unknown, which is why it's typically administered As needed for optimal therapeutic effect.

How do I reconstitute Bacteriostatic Water (BAC Water)?

Add bacteriostatic water to the peptide vial slowly down the side. Typical reconstitution uses 2-3ml of water for a 5mg vial. Gently swirl, do not shake.

Healing & Recovery

Approved

Bacteriostatic Water (BAC Water)

Also known as: BAC water, BAC, bac water, bacteriostatic water, sterile water with benzyl alcohol, reconstitution water

Overview

Key Facts

Primary Goal: Bacteriostatic water (BAC water) is sterile water that contains 0

Bacteriostatic water (BAC water) is sterile water that contains 0.9% benzyl alcohol as a bacteriostatic preservative. It is the standard diluent used to reconstitute lyophilized (freeze-dried) peptides before injection. The benzyl alcohol prevents bacterial growth, allowing the reconstituted solution to be used over multiple doses for up to 28 days, unlike sterile water which must be used immediately. BAC water is an essential supply for anyone working with injectable peptides. Available Sizes 10 mL, 20 mL, 30 mL Usage Per vial reconstitution Shelf Life Use within 28 days after opening

Dosing Information

Half-Life

Unknown

Typical Dose

Varies

Frequency

As needed

Cycle Length

Varies

Administration Routes:

Storage & Reconstitution

Unreconstituted (Powder)

Temperature20–25°C (68–77°F)

DurationUp to 3 months

Reconstituted (Mixed)

Temperature20–25°C (68–77°F)

Duration2-4 weeks

Research Summary

Approved

Bacteriostatic water is a USP-grade pharmaceutical product widely used in clinical and research settings. The 0.9% benzyl alcohol concentration has been established as effective for preventing microbial growth while remaining safe for subcutaneous and intramuscular injection in adults. It is the universally recommended diluent for reconstituting lyophilized peptides, preferred over sterile water due to its multi-dose preservation capability. The 28-day use window after opening is an FDA-established guideline for multi-dose vials. This information is for educational purposes only. Always consult a qualified healthcare professional before using any peptide.