Reconstitution Calculator Guide
Peptide dosing math intimidates many newcomers, but it reduces to one simple formula. Understanding the relationship between peptide amount, water volume, and syringe units eliminates dosing errors and builds confidence in peptide preparation.
Key Points
Step-by-Step Guide
Learn the Core Formula
Concentration = Peptide Amount / Water Volume. Example: 5 mg / 2 mL = 2.5 mg/mL = 2500 mcg/mL = 250 mcg per 0.1 mL (10 units on a 1 mL insulin syringe).
Understand Syringe Units
A standard 1 mL insulin syringe has 100 units. Each unit = 0.01 mL. So 10 units = 0.1 mL, 25 units = 0.25 mL, 50 units = 0.5 mL. A 0.5 mL syringe has 50 units.
Work Backwards from Desired Dose
Want 250 mcg per 10-unit draw from a 5 mg vial? Water = 5000 mcg / (250 mcg / 0.1 mL) = 5000 / 2500 = 2 mL. Add 2 mL of BAC water.
Use Online Calculators
Peptide reconstitution calculators are available online. Input: peptide mg, water mL, desired dose mcg. Output: units to draw. Use these to verify your manual calculations.
Create a Reference Card
Write a card for each peptide: "Peptide X: 5mg vial + 2mL BAC = 250mcg per 10u." Keep it with your supplies. Eliminates mental math at injection time.
Warnings & Precautions
- !Mcg vs mg confusion is the most dangerous calculation error (1000x difference).
- !Always double-check math before the first dose from a new vial.
- !Use a calculator or online tool rather than mental math for new peptides.
- !Different syringe sizes have different unit markings—verify yours.
Frequently Asked Questions
What is the easiest way to calculate peptide doses?
Add BAC water to get a round number concentration. Example: 5 mg + 2 mL = 2.5 mg/mL. Then 0.1 mL = 250 mcg, 0.2 mL = 500 mcg. Choosing "clean" concentrations simplifies all future dose calculations.
What if I added the wrong amount of water?
You can add more water to dilute (lower concentration, larger draw volume per dose). You cannot remove water. Recalculate the new concentration: Peptide mg / Total water mL = new concentration. Relabel the vial.
How do I convert between IU marks and mL?
On a 1 mL/100 unit syringe: divide units by 100 to get mL. 10 units = 0.1 mL, 25 units = 0.25 mL, 50 units = 0.5 mL. On a 0.5 mL/50 unit syringe: divide units by 100 (same conversion, syringe just stops at 50).