Educational & research purposes only. These tools do not provide medical advice or dosing recommendations. Research peptides are not approved for human therapeutic use. Always consult a licensed healthcare provider.
What reconstitution actually means, the simple arithmetic behind it, and the mistakes that matter. This page teaches the method — it is not a calculator for your personal protocol.
Educational / research calculation only — NOT medical advice. The numbers below are illustrative, chosen to demonstrate the arithmetic. They are not a recommended dose for any compound. Research peptides are not for human therapeutic use. Always consult a licensed healthcare provider, and follow their and your pharmacist's instructions.
concentration (mg/mL) = vial mg ÷ water mL
How much peptide is in each millilitre once you add bacteriostatic water. More water → lower concentration → larger, easier-to-measure volumes (but the vial runs out sooner).
draw (mL) = portion mg ÷ concentration
How many millilitres contain the portion you want. This is where the most dangerous error hides — see the units warning below.
units (U-100) = draw mL × 100
On a U-100 insulin syringe, 100 units = 1 mL, so 0.1 mL = 10 units.
1 mg = 1000 mcg. A 5 mg vial holds 5000 mcg. If a protocol is written in micrograms (e.g. “250 mcg”) and read as milligrams, that is a 1000× error. Always confirm which unit you are working in before doing any arithmetic — and verify with a licensed professional. Other things worth checking by hand: whether a draw volume is too small to measure accurately (a few units or less), larger than your syringe, or larger than the vial holds.
Illustrative numbers only — not dosing recommendations.
5 mg vial · 2 mL water · illustrative 0.25 mg portion
5 mg ÷ 2 mL = 2.5 mg/mL. Drawing an illustrative 0.25 mg portion: 0.25 ÷ 2.5 = 0.1 mL, which is 10 units on a U-100 insulin syringe (since 1 mL = 100 units).
10 mg vial · 1 mL water · illustrative 0.5 mg portion
10 mg ÷ 1 mL = 10 mg/mL. An illustrative 0.5 mg portion = 0.05 mL = 5 units. That is a very small volume — only a few units, which is hard to measure accurately by hand.
5 mg vial · 3 mL water · illustrative 0.25 mg portion
5 mg ÷ 3 mL ≈ 1.67 mg/mL. The same illustrative 0.25 mg portion now = 0.15 mL = 15 units. More water makes the draw volume larger and easier to measure precisely — a trade-off against how long the vial lasts.
The concentration (mg/mL) you get from common vial sizes and water volumes. This is just vial ÷ water — a property of the mixed vial, not a dose.
| Vial ↓ / Water → | 1 mL | 2 mL | 3 mL | 5 mL |
|---|---|---|---|---|
| 2 mg | 2.00 mg/mL | 1.00 mg/mL | 0.67 mg/mL | 0.40 mg/mL |
| 5 mg | 5.00 mg/mL | 2.50 mg/mL | 1.67 mg/mL | 1.00 mg/mL |
| 10 mg | 10 mg/mL | 5.00 mg/mL | 3.33 mg/mL | 2.00 mg/mL |
| 15 mg | 15 mg/mL | 7.50 mg/mL | 5.00 mg/mL | 3.00 mg/mL |
| 30 mg | 30 mg/mL | 15 mg/mL | 10 mg/mL | 6.00 mg/mL |
The Dosed app does the reconstitution math, saves it, and logs every dose and injection site — so you never re-derive it on a notepad. 100% on-device.
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