Can I use sterile water instead of BAC water?

Sterile water can be used but lacks preservatives. Reconstituted peptides with sterile water should be used immediately or within a few days. BAC water is preferred for multi-dose vials.

How do I add water to the peptide vial?

Draw the calculated amount of BAC water into a syringe. Insert the needle into the vial at an angle, letting the water run down the side of the vial - never spray directly onto the peptide cake. Gently swirl (don't shake) until dissolved.

How should I store reconstituted peptides?

Store reconstituted peptides in the refrigerator (36-46°F / 2-8°C). Keep away from light. Most reconstituted peptides remain stable for 28 days when properly stored with BAC water.

What does 'units' mean on an insulin syringe?

On a U-100 insulin syringe, 100 units equals 1mL. So 10 units = 0.1mL, 50 units = 0.5mL, etc. This makes it easy to measure small volumes precisely.

Peptide Reconstitution Calculator | BAC Water Mixing Guide | DosageCalc.co

Name: Peptide Reconstitution Calculator | BAC Water Mixing Guide
Creator: DosageCalc.co
Published: 2024-01-01

Peptide Reconstitution Calculator

Calculate the optimal reconstitution volume and dosing for your peptides

Peptide Name

Reconstitution Date

COA Amount in VialCertificate of Analysis amount from your vial

mg

Vial Size

Desired Dose per Injection

mg

Recommended Concentration

Optimal for 20 units/dose

1.35 ml BAC

20 mg/ml

Alternate Concentrations

Custom Amount (optional)Enter a custom BAC water amount

ml

Per Dose (4mg)

20 units

(0.20 cc / 0.20 ml)

Doses per Vial

6.8 doses

at 4mg each

1ml (100 unit) Insulin Syringe

Dose Fill Level

0

10

20

30

40

50

60

70

80

90

100

20 units | 0.20 ml | 0.20 cc

Vial Label

Peptide

27mg COA

1.35ml BAC

20mg/ml

4mg dose

20u

0.20cc

01/26/26

Label sized for 30mm × 12mm vial labels

Peptide / 20mg/ml
27mg / 1.35ml BAC
4mg / 20 units
January 26th, 2026

Peptides are for research purposes only. This calculator is for educational use. Always verify calculations independently. Use sterile technique when handling peptides. Consult a healthcare provider before any research involving peptides.

About This Calculator

Peptide reconstitution requires precise calculations to ensure accurate dosing. This calculator helps you determine how much bacteriostatic water to add and how many units to draw on an insulin syringe for your desired dose.

How It Works

Enter the peptide amount from your vial label, choose how much BAC water to add, and specify your target dose. The calculator shows the concentration and exactly how many units to draw on your syringe. The visual syringe guide helps verify your measurement.

Frequently Asked Questions

Bacteriostatic water (BAC water) is sterile water with 0.9% benzyl alcohol added as a preservative. It prevents bacterial growth, allowing reconstituted peptides to be stored for multiple uses (typically 28 days refrigerated).

Clinical Review

Dr. Igor I. Bussel, MD

Board-Certified Ophthalmologist

Dr. Igor I. Bussel is a board-certified ophthalmologist and fellowship-trained surgeon affiliated with the University of California, Irvine (UCI), the Gavin Herbert Eye Institute, and the UCI School of Medicine.

Last Updated: 2025-01-05

Sources & Guidelines

Medically Reviewed

Evidence-Based

Updated 2025-01-05

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References

Reviewed by: Research Team (Laboratory Specialists)

Last updated: 2025-01-05