Interactive tool · Reconstitution math

Peptide Reconstitution & Dosage Calculator

Reconstituting a lyophilized vial turns a peptide mass and a volume of bacteriostatic water into a concentration — and then into a small, hard-to-eyeball number of units on a U-100 insulin syringe. This tool does that arithmetic transparently so you can sanity-check what a protocol asks you to draw. It is math, not a dose recommendation.

Read before you use this

This is an educational math tool, not medical advice, and not a recommendation to use any peptide. Most research peptides (BPC-157, TB-500, and similar) are not FDA-approved for human use and are sold through a grey market where purity and labeling are not guaranteed. Dosing, reconstitution, and injection technique must be directed and supervised by a licensed clinician. Never self-prescribe or adjust a dose on your own. Always verify the certificate of analysis (COA) and the product label, and treat every figure below as a starting point to confirm with your prescriber — check the vial strength, the water you added, and the target dose before drawing anything.

Peptide in the vialmgTotal peptide mass labeled on the vial, e.g. 5 or 10 mg.Bacteriostatic water addedmLHow much BAC water you reconstitute the vial with, e.g. 1, 2, or 3 mL.

Desired dose

Most research-peptide doses are expressed in micrograms (mcg). 1 mg = 1000 mcg.

Draw on a U-100 insulin syringe

10units

to deliver a 250 mcg dose = 0.1 mL.

Concentration: 2.5 mg/mL; 5 mg ÷ 2 mL
Volume to inject: 0.1 mL; 0.25 mg ÷ 2.5 mg/mL
Doses per vial: 20; 5 mg ÷ 0.25 mg

How it is calculated. Concentration = vial (mg) ÷ bacteriostatic water (mL). Volume to inject = dose (mg) ÷ concentration. A U-100 insulin syringe holds 100 units per 1 mL, so units to draw = volume (mL) × 100. Doses per vial = vial (mg) ÷ dose (mg). Worked example: a 5 mg vial reconstituted with 2 mL = 2.5 mg/mL; a 250 mcg dose = 0.1 mL = 10 units, giving 20 doses per vial.

Understand the context first

A number on a syringe is the easy part. Whether a research peptide is appropriate, safe, or legal to use at all is the part that actually matters — read these before you reconstitute anything:

This calculator is informational and not medical advice. It performs unit arithmetic only and does not account for your individual health, the specific product, injection technique, or clinical appropriateness. Research peptides such as BPC-157 and TB-500 are largely not FDA-approved for human use, are sold on the grey market, and carry unverified purity and safety profiles. Talk to a licensed clinician before acting on any number here.