Peptide reconstitution calculator
Enter the vial size, the water and your target dose — get the concentration and the exact marks to draw on an insulin syringe. Instant, free, research use only.
Reconstitution calculator
Research use onlySyringe
Peptide in vial
Bacteriostatic water
Concentration2.5 mg/mL
Target dose
For laboratory research calculation only. Not medical or dosing advice, and not for human or veterinary use.
How reconstitution works
Peptides ship freeze-dried (lyophilised) as a dry powder. Reconstitution means dissolving that powder in bacteriostatic water to make a liquid of known concentration. Two numbers decide everything: how much peptide is in the vial (mg) and how much water you add (mL). Concentration = mg ÷ mL.
New to this? Read our guide on how to reconstitute peptides step by step and storage & stability. Planning a dose by bodyweight? Use the dosage calculator.
Frequently asked questions
How do I use the peptide reconstitution calculator?+
Enter three values: the amount of peptide in the vial (mg), the volume of bacteriostatic water you add (mL), and your target dose (mcg). The calculator returns the concentration (mg/mL and mcg/mL) and the exact number of marks to draw on a U-100, U-50 or U-40 insulin syringe.
What water do you use to reconstitute peptides?+
Research protocols use bacteriostatic water — water with 0.9% benzyl alcohol — because it suppresses bacterial growth and allows a vial to be accessed multiple times. Sterile or distilled water also dissolves the peptide but carries no preservative.
How much water should I add to a 5 mg vial?+
That is your choice and sets the concentration. 2 mL of water in a 5 mg vial gives 2.5 mg/mL (2500 mcg/mL); 1 mL gives 5 mg/mL. More water means a lower concentration and more marks per dose, which makes small doses easier to measure accurately.
Is this calculator medical advice?+
No. It is a calculation aid for research purposes. Peptyds products are supplied strictly for laboratory research and are not for human consumption.