How do I reconstitute a research peptide?

To reconstitute a research peptide, add bacteriostatic water slowly to the lyophilized (freeze-dried) peptide vial using a sterile syringe. Common reconstitution volumes are 1ml, 2ml, or 3ml of bacteriostatic water per vial. Use this calculator to determine your exact syringe draw based on your desired dose.

What is bacteriostatic water?

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth and allows for multiple-use vials. It is the standard diluent used for reconstituting research peptides in laboratory settings.

How many units on an insulin syringe is 100mcg?

The number of units depends on your reconstitution volume. For example, if you add 1ml of bacteriostatic water to a 10mg vial, the concentration is 10mcg per unit on a 100-unit syringe. For a 100mcg dose you would draw 10 units. Use the calculator above for your exact figures.

What syringe should I use for peptide research?

For laboratory research, insulin syringes are commonly used due to their precision. They come in 0.3ml (30 unit), 0.5ml (50 unit), and 1.0ml (100 unit) sizes. This calculator shows your draw in both microliters and units for all three syringe types.

Best Peptide Reconstitution Calculator 2026 — Free Online Tool

⚡ Quick fill — common compounds

1. What is the Total Volume of Your Syringe?

2. Peptide Vial Size

3. Desired Dose

mcg

4. How Much Bacteriostatic Water Are You Adding?

📊 Your Results

🧪

Select your syringe size, vial size, dose, and water volume to see results

Concentration

—

mcg per 0.01ml (1 unit)

0.3ml Syringe (30 units)

—

— µl

0.5ml Syringe (50 units)

—

— µl

1.0ml Syringe (100 units)

—

— µl

ⓘ This calculator is for informational purposes only. For laboratory research use only. Not for human consumption. Always verify calculations independently before use.

How to Reconstitute a Research Peptide

Gather supplies
You need: lyophilized peptide vial, bacteriostatic water, insulin syringe, alcohol wipes

Clean vial tops
Wipe the rubber stopper on both vials with an alcohol wipe and allow to dry

Draw bacteriostatic water
Draw your chosen volume (1ml, 2ml etc) from the bacteriostatic water vial

Add slowly to peptide
Inject the water slowly down the side of the peptide vial — do not spray directly onto the powder

Swirl gently
Gently roll the vial between your palms — never shake. The powder should dissolve into a clear solution

Use the calculator
Enter your vial size, water added, and desired dose above to get your exact draw amount

Frequently Asked Questions

The most common volumes are 1ml, 2ml, or 3ml. Using more water lowers the concentration, making it easier to measure smaller doses accurately. Using less water increases concentration, which means smaller draw volumes per dose. For peptides dosed in the 100-500mcg range, 2ml is typically a good balance. Use the calculator above to see exactly what each water volume means for your draw size.

Reconstituted research peptides stored in bacteriostatic water typically remain stable for 4–6 weeks when refrigerated at 2–8°C (36–46°F). Lyophilized (freeze-dried) peptides before reconstitution have a much longer shelf life of 1–2 years when stored properly in a freezer. Always check vendor COA documentation for specific stability data.

1 milligram (mg) = 1,000 micrograms (mcg). Peptide vials are typically sold in milligrams (5mg, 10mg, 20mg) while doses are often expressed in micrograms (100mcg, 250mcg, 500mcg). The calculator handles both units — select mcg or mg in the custom dose input.

Insulin syringes are marked in "units" where 100 units = 1ml = 1cc. A 0.3ml syringe has 30 units total. A 0.5ml syringe has 50 units. A 1.0ml syringe has 100 units. Each unit = 0.01ml = 10 microliters. The calculator shows your draw in both microliters (µl) and syringe units for all three common syringe sizes.

Bacteriostatic water (containing 0.9% benzyl alcohol) is preferred for research use because it inhibits bacterial growth, allowing the vial to be used multiple times. Regular sterile water does not contain a preservative, so it is only suitable for single-use reconstitution. For any multi-draw research protocol, bacteriostatic water is the standard diluent.

A properly reconstituted research peptide should be clear and colorless. Cloudiness may indicate the peptide has not fully dissolved (try gentle rolling, not shaking), the temperature is too cold (allow to warm slightly), or in some cases may indicate degradation or contamination. Consult your vendor's COA and documentation for the expected appearance of your specific compound.

⚠ Research Use Disclaimer: This peptide reconstitution calculator is provided for informational and laboratory research purposes only. All calculations should be independently verified before use in any research context. This tool does not constitute medical advice, scientific guidance, or a recommendation to use any compound for any purpose. All research compounds are intended strictly for in vitro laboratory research use only and are not approved by the FDA for human or veterinary use. This site does not sell, manufacture, or supply any compounds. Full disclaimer →