PeptideUtils

Dosage Calculator

Enter your vial weight and target dose, choose a syringe, and we'll suggest how much bacteriostatic (BAC) water to add so each dose lands on a clean syringe marking.

For research and informational purposes only. Not medical advice and not for human consumption. These tools are calculators — verify all figures independently before acting on them.
Syringe size
Desired dose
BAC water to add

Add this much BAC water

2.00 mL

05101520253035404550units

Injection dose: 10.0 units (0.100 mL)

Concentration
2.50 mg/mL
Doses per vial
20

Reconstitution guide

  1. 1Wipe the rubber stopper of both the BAC water and the peptide vial with an alcohol swab and let them air-dry.
  2. 2Draw 2.00 mL of bacteriostatic (BAC) water into a syringe.
  3. 3Inject the water slowly into the 5 mg vial, aiming it down the inside wall — not directly onto the powder.
  4. 4Swirl gently (do not shake) until the solution is completely clear.
  5. 5This gives 2.50 mg/mL. For a 0.25 mg dose, draw 10.0 units (0.100 mL) on the syringe.
  6. 6The vial holds about 20 doses at this dose size.

Use sterile technique. Swirl, never shake. Store the reconstituted vial as directed for the compound (usually refrigerated).

How it works

The dose you draw depends on the concentration, which is set by how much water you add: concentration = vial mg ÷ water mL. Vial weight and dose alone don't fix the water amount, so the "Pick for me" option picks a round water volume that makes one dose land on a clean syringe mark (and stays within your vial volume limit). Prefer your own number? Switch to manual and we'll show the resulting draw.

FAQ

What is BAC water? Bacteriostatic water — sterile water with 0.9% benzyl alcohol used to reconstitute lyophilized (freeze-dried) powder.

What are "units"? On a U-100 insulin syringe, 100 units = 1 mL, so 10 units = 0.1 mL.