Peptide Calculator
Our peptides are supplied as lyophilised (freeze-dried) powders — stable at room temperature during transit. Before use, reconstitute with bacteriostatic water. Once reconstituted, store refrigerated at 2–8 °C to preserve potency.
Reconstitution FAQ
Answers to the most common questions researchers have when reconstituting lyophilised peptides.
Bacteriostatic water (BAC water) is sterile water preserved with 0.9% benzyl alcohol, which inhibits bacterial growth in the vial after opening. It is the standard diluent for reconstituting lyophilised research peptides because it significantly extends the usable life of the reconstituted solution compared to plain sterile water. Each time you draw from a vial, benzyl alcohol prevents contamination — making BAC water the preferred choice for multi-draw research vials.
There is no single correct volume — the amount depends on your target concentration and the sample size required for each experiment. A common starting point for a 10 mg vial is 1 to 2 ml of BAC water. Use the calculator above to find the exact volume based on your vial strength, desired dose, and syringe size. Adjust the BAC water volume to bring your required injection volume within the capacity of your syringe.
Once reconstituted, peptides should be stored refrigerated at 2-8 °C and used within 28 days. Keep vials away from direct light and avoid freeze-thaw cycles, which can degrade the compound and affect results. Lyophilised (unreconstituted) peptides have a significantly longer shelf life when stored correctly at room temperature away from light, making it advisable to reconstitute only what is needed for each research cycle.
On a standard U-100 insulin syringe, 100 units equals 1 ml. Each small tick mark represents 1 unit (0.01 ml), with larger marks every 10 units. The three syringe sizes available in the calculator above are: 0.3 ml (30 IU), 0.5 ml (50 IU), and 1 ml (100 IU). The calculator converts your required injection volume into units automatically, so you can draw to the exact marker without needing to convert manually.
Sterile water will dissolve lyophilised peptides, but it lacks the benzyl alcohol preservative found in BAC water. Without this preservative, reconstituted solutions are more susceptible to bacterial contamination and degrade more rapidly after opening. For single-draw experiments where the entire vial is used immediately, sterile water may be acceptable. For multi-draw research vials accessed over days or weeks, BAC water is strongly preferred to maintain solution integrity.
This error means the calculated injection volume is larger than the barrel of your selected syringe. There are two straightforward ways to resolve it: (1) select a larger syringe in the calculator above — switching from 0.3 ml to 0.5 ml or 1 ml will increase capacity; or (2) reduce the BAC water volume used during reconstitution, which increases the concentration of the solution and reduces the injection volume needed for the same dose. Re-run the calculator after adjusting either value.