Peptide Reconstitution & Storage Calculator – UK Research Guide

Use the calculator below to work out peptide concentration after reconstitution with bacteriostatic water, and the volume to draw on a standard 100-unit insulin syringe for a given target amount. This is a calculation aid for research handling — it performs simple arithmetic from the numbers you enter and does not store, transmit, or evaluate any data.

Reconstitution Concentration Calculator

Enter the peptide amount shown on the vial and the volume of bacteriostatic water you add. The calculator returns the resulting concentration in mg/mL and, if you enter a target amount, the number of units to draw on a 100-unit (1 mL) syringe.

How the calculation works

• Concentration (mg/mL) = peptide amount in the vial (mg) ÷ volume of water added (mL).
• mcg per unit on a 100-unit syringe = concentration (mg/mL) × 1000 ÷ 100, since 100 units = 1 mL.
• Units to draw = target amount (mcg) ÷ mcg per unit.

Peptide Storage & Stability Reference

General reference points drawn from published peptide-handling literature. These are not specific to any single product — always store and handle materials in line with the information provided for the specific batch.

• Lyophilised powder, unopened — Stable refrigerated at 2–8 °C. For long-term holding, −20 °C is preferable. Keep vials sealed and away from light.
• After reconstitution — Refrigerate at 2–8 °C and use within the working window appropriate to the compound. Reconstituted peptides degrade considerably faster than powder.
• Freeze–thaw cycling — Avoid it. Repeatedly freezing and thawing the same vial is one of the most common causes of unexplained potency loss between experiments.
• Choice of water — Use bacteriostatic water where a multi-use working solution is required, and sterile water where a single-use preparation is appropriate.

Frequently Asked Questions

Does this calculator store the numbers I enter?

No. The calculation runs in your browser and nothing is saved or sent anywhere.

Is this dosing advice?

No. It is a unit-conversion aid for research handling, not guidance on use in humans or animals.

Why does reconstituted peptide need to be used sooner than powder?

Once a peptide is in solution it is more exposed to temperature, light and microbial degradation than when freeze-dried, so published handling guidance generally gives it a shorter stable window.

Where can I find the Certificate of Analysis for a specific batch?

See our Lab Results & Certificate of Analysis (COA) page for third-party test reports by product.

Research Use Only. All products sold by Arma Peptides are intended strictly for laboratory and in-vitro research purposes by qualified professionals. Not for human or veterinary consumption or administration. Not a medicinal product and not approved for clinical, therapeutic, or diagnostic use. See our full Disclaimer for details.