Peptide Dosage Calculator
Medically reviewed by the Rite Aid Health Team · Last updated June 16, 2026
Reconstitution is where most first-time peptide users make mistakes: mixing the powder with the wrong amount of water, or misreading how many units to draw on the syringe.
Enter your vial size, the bacteriostatic water you are adding, and your target dose. The calculator returns the concentration, exact syringe units, and doses per vial.
Units to draw
How to use it
- Vial size. Enter the milligrams of peptide in your vial, such as 5 mg.
- Bacteriostatic water. Enter how many milliliters you are adding to reconstitute it.
- Target dose. Enter the dose your protocol calls for, in mcg or mg.
- Syringe. Select your syringe type. A U-100 insulin syringe is standard for many subcutaneous injections.
The calculator handles the arithmetic, not the protocol. Get your target dose from your provider or the individual peptide dosage section.
Worked example
A 5 mg vial reconstituted with 2 mL bacteriostatic water creates a 2.5 mg/mL solution, or 2,500 mcg/mL. A 250 mcg dose is 0.1 mL, which is 10 units on a U-100 insulin syringe. The vial yields 20 doses.
Safety note
This calculator handles reconstitution arithmetic only. It does not set your dose, confirm that a peptide is appropriate for you, or confirm legal status. Get your target dose from a licensed provider, use bacteriostatic water as directed, store the vial properly, and never share needles.
Related peptide dosage guides
BPC-157, TB-500, Sermorelin, Ipamorelin, CJC-1295, Tesamorelin, MK-677, and GHK-Cu each explain common dosage ranges and monitoring considerations.
Related next steps
Learn more about health topics related to this calculator.
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Frequently Asked Questions
Answers to common questions about this page and how to use what you find here.
Sources
- Rite Aid peptide therapy guide
- Rite Aid biomarker pages
This calculator is for peptide reconstitution math only. It does not set a peptide dose, create a protocol, diagnose, treat, or replace advice from a qualified healthcare professional.
Divide the vial amount by the bacteriostatic water you add to get the concentration, then divide your target dose by that concentration to get the volume to inject. On a U-100 insulin syringe, multiply that volume in mL by 100 to get the units to draw.
There is no single correct amount. More water dilutes the peptide and increases the units you draw per dose; less water concentrates it. Common volumes are 1 to 3 mL.
It depends on your concentration. With a 5 mg vial reconstituted in 2 mL, a 250 mcg dose is 0.1 mL, which is 10 units on a U-100 insulin syringe.
A syringe marked so that 100 units equals 1 mL. It is commonly used for small-volume subcutaneous injections because it measures small volumes accurately.
Divide the total peptide in the vial, in mcg, by your target dose in mcg. A 5 mg vial contains 5,000 mcg, so a 250 mcg dose yields 20 doses.