CJC-1295 Reconstitution Calculator
CJC-1295 is supplied lyophilised, typically in single-digit milligram vials. Enter your vial amount, water volume and dose to convert to exact syringe units.
100 units per mL — pick the syringe you have.
Draw to
BAC water
on a U-100 insulin syringe
Drag the syringe to set your dose, or type the values above.
Enter your vial amount and dose, then type the bacteriostatic water or drag the syringe to see the exact units to draw.
Vial sizes and water volumes are shown for convenience — the dose field is deliberately not prefilled and has no suggestions. Enter your own numbers.
Never do this math twice.
The Pep AI app remembers your vials and doses, shows an interactive syringe you draw to, counts down the doses left in each vial, and reminds you when it's time. Free on iOS and Android.
How the conversion works
Three steps. The dose used below is arbitrary, chosen only to show the arithmetic:
1. Concentration
Vial amount ÷ water added. A 2 mg vial with 2 mL of water is 1 mg/mL.
2. Volume per dose
Your dose ÷ concentration. A 0.1 mg dose at 1 mg/mL is 0.1 mL.
3. Units to draw
Volume per dose × 100 for a U-100 syringe (or × 40 for a U-40). 0.1 mL on a U-100 syringe is 10 units.
Worked example
You have a 2 mg vial, you want a 100 mcg dose, and you add 2 mL of bacteriostatic water. Concentration is 2 ÷ 2 = 1 mg/mL. Volume per dose is 0.1 ÷ 1 = 0.1 mL. On a U-100 syringe that's 0.1 × 100 = 10 units, and the vial holds 20 doses.
Check which version your vial is
CJC-1295 is sold in two forms that behave completely differently. The DAC version carries an albumin-binding group that extends its half-life to roughly a week; the version without DAC — often labelled modified GRF (1-29) — clears in minutes. Both are routinely labelled simply 'CJC-1295'.
The reconstitution arithmetic is identical either way, since concentration does not care about pharmacokinetics. What differs is everything downstream, so it is worth knowing which one is in front of you before you plan anything around it.
The CJC-1295 half-life calculator charts the DAC version's curve and explains the difference in full.
Frequently asked questions
This calculator is provided for informational and educational purposes only and is not medical advice. Always confirm dosing with a qualified healthcare professional and double-check your own measurements before administering anything.
Built by the Pep AI team.