Peptide Reconstitution Calculator

Enter the dose you want, how much peptide is in the vial, and how much bacteriostatic water you added. The calculator returns the concentration, the volume to draw in insulin units, and how many doses the vial holds.

The arithmetic is simple enough to check by hand: concentration is vial divided by water, the draw is dose divided by concentration, and units are millilitres multiplied by 100.

This is a calculator, not clinical guidance. It does arithmetic on the numbers you type and knows nothing about your compound, its stability, or what is appropriate for any individual. Many peptides are not approved for human use. Decisions about whether, what and how much to administer belong with a qualified clinician.

Dose of Peptide

0.25 mg = 250 mcg

Peptide Strength

Vial size

Common: BPC-157 10mg, NAD+ 1000mg

Bacteriostatic Water

Amount added

Common: GLP-1s 2mL, NAD+ 5mL

Result

Peptide dose
0.25mg
Draw syringe to
5units
Your vial contains
20doses
Concentration
5mg/mL
102030405060708090

A note on reconstitution: this calculator does the arithmetic, nothing more. Reconstitution volumes, concentrations and stability vary by compound, and the figures here do not apply to every peptide. It is a general reference, not dosing advice, and it is not a substitute for the guidance of a qualified clinician. Always verify the correct handling for your specific compound.

Common questions

How do I work out how much to draw into the syringe?

Divide the vial's peptide content by the volume of bacteriostatic water added to get the concentration in mg per mL. Divide the dose you want by that concentration to get the volume in mL. Multiply by 100 to read it as insulin units, because a 1 mL insulin syringe is graduated 0 to 100.

What does an insulin unit correspond to in mL?

One unit on a U-100 insulin syringe is one hundredth of a millilitre, so 100 units is 1 mL and 10 units is 0.1 mL. The markings count volume, not peptide, so the same unit mark is a different dose at a different concentration.

Does adding more bacteriostatic water change the dose?

No. It changes the concentration and therefore the volume you draw, but not the amount of peptide in that dose. More water means a lower concentration and a larger, easier-to-measure draw. Less water means a smaller draw that is harder to measure accurately.

The calculator says more than 100 units. What now?

The dose does not fit in a single 1 mL insulin syringe at that concentration. Reconstitute with more bacteriostatic water to lower the concentration, or draw more than one syringe. The calculator flags this rather than pinning the marker to the end of the barrel.

Is this medical advice?

No. It performs arithmetic on numbers you enter. It does not know your compound, its stability, or what dose is appropriate for anyone. Reconstitution volumes and handling vary by compound, and dosing decisions belong with a qualified clinician.

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