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Supplies Available with prescription or from research supply companies

Bacteriostatic Water

Also known as: Bac Water, BAC Water, 0.9% Benzyl Alcohol Water

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$12

10 mL

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Bacteriostatic water is sterile water mixed with 0.9% benzyl alcohol, which prevents bacterial growth in multi-dose vials. It is the standard diluent used to reconstitute lyophilized (powdered) peptides for subcutaneous or intramuscular injection. Without bacteriostatic water, reconstituted peptides would only be safe to use for hours rather than weeks.
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Half-Life

N/A (carrier solution)

Common Dose

1–5 mL depending on peptide and desired concentration

Route

Drawn into syringe and slowly injected into peptide vial

Frequency

Used as needed for peptide reconstitution

Mechanism of Action

The benzyl alcohol acts as a bacteriostatic agent — it does not kill bacteria but inhibits their growth, allowing the same vial of reconstituted peptide to be safely accessed multiple times over 28+ days when refrigerated. The water itself serves as a sterile, pH-balanced carrier for the peptide.

Reported Benefits

  • Required to reconstitute powdered peptides for injection
  • Allows multi-use of a single peptide vial (28+ days)
  • Sterile and pH-balanced
  • Prevents bacterial contamination during repeated draws
  • Standard medical-grade diluent

Dosage Protocol

Common dose1–5 mL depending on peptide and desired concentration
RangeMost peptides reconstitute with 1–3 mL
FrequencyUsed as needed for peptide reconstitution
AdministrationDrawn into syringe and slowly injected into peptide vial

Notes

Slowly add bac water down the side of the peptide vial — do not spray directly onto the lyophilized powder. Gently swirl (do not shake) until fully dissolved. Once reconstituted, refrigerate the vial and use within 28–30 days.

Research Status

Standard medical supply, used worldwide for injectable medications.

Storage

Room temperature before opening. Refrigerate after first use; replace per manufacturer expiration.

Legal Status

Available with prescription or from research supply companies. Widely used and legally available.

Dose Calculator

Enter your vial size, water volume, and desired dose to see exactly how many units to draw.

Total milligrams in the vial (check the label)

Bacteriostatic water added to reconstitute

Micrograms you want per injection

Insulin syringe capacity

Results

Concentration

mcg/mL

Volume to Inject

mL

Draw to Mark

units

Doses per Vial

doses

Fill in all fields above to see your results.

Quick Reference

1 mg= 1,000 mcg
1 mL= 100 units (on a 100u syringe)
1 mL= 1 cc
Common reconstitution1–3 mL BAC water per vial

How long will this vial last?

Choose the vial strength, enter the amount used per draw, and add the number of draws per week to estimate how long it will last.

Estimated duration

Email me this protocol

Keep a copy of these calculated values for your laboratory records.

This will open your default email app to send the protocol. Automated email delivery can be connected separately.

Research use only. This tool is a mathematical reference for trained laboratory personnel. It does not recommend a dose, injection volume, treatment, or human use. Always follow your approved protocol, product documentation, and applicable regulations.

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