Peptide Reconstitution Calculator

What is peptide reconstitution?

Research peptides ship as a lyophilised (freeze-dried) powder inside a sealed vial. Before the peptide can be drawn into a syringe, the powder must be dissolved into a liquid — a process called reconstitution. The diluent of choice for most research peptides is bacteriostatic water, which contains 0.9% benzyl alcohol as a preservative so the reconstituted solution stays stable in the fridge for several weeks.

Why concentration matters

The concentration of your reconstituted vial determines how many units to draw on an insulin syringe to hit a target dose. Three numbers fully describe a vial:

• Vial size — total peptide content in milligrams (mg). Printed on the vial label.
• Diluent volume — the amount of bacteriostatic water you add, in millilitres (mL). Common values are 1 mL, 2 mL, or 3 mL.
• Target dose — the peptide quantity per administration, usually in micrograms (mcg). 1 mg = 1,000 mcg.

From those three inputs, the calculator above derives the concentration (mg/mL), the syringe draw volume in standard insulin-syringe units (where 100 units = 1 mL), and the total number of doses your vial will yield.

Typical reconstitution volumes

Most research protocols use one of three diluent volumes, chosen to keep the syringe-draw value somewhere between 5 and 50 units for ease of measurement:

• 1 mL — concentrated solution. Suits low doses and minimises syringe volume.
• 2 mL — the most common default. Balances concentration with measurement precision.
• 3 mL — diluted. Suits higher doses or protocols that need finer increments.

The default vial-size and BAC water values pre-populated for each product on this page mirror what we publish on every individual product page, so the answer you see here is the same answer you see on the PDP. Always cross-check against the protocol in the published research relevant to your work.

Storage after reconstitution

Once reconstituted with bacteriostatic water, most peptides stay stable for 4-6 weeks refrigerated at 2-8 °C. Avoid freeze-thaw cycles, keep the vial upright, and never inject cold solution — always allow it to warm to room temperature. See the full peptide storage guide for handling specifics by compound class.