GHK-Cu Reconstitution Calculator
GHK-Cu vials are supplied lyophilised and in a range of sizes. Enter your vial amount, the bacteriostatic water you are adding and your dose to get the exact units to draw on a U-100 or U-40 syringe.
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.
Concentration, volume, units
The arithmetic is the same for any compound. The dose below is arbitrary — chosen to show the steps, not to suggest anything:
1. Concentration
Vial amount ÷ water added. A 50 mg vial with 5 mL of water is 10 mg/mL.
2. Volume per dose
Your dose ÷ concentration. A 2 mg dose at 10 mg/mL is 0.2 mL.
3. Units to draw
Volume per dose × 100 for a U-100 syringe (or × 40 for a U-40). 0.2 mL on a U-100 syringe is 20 units.
Worked example
You have a 50 mg vial, you want a 2 mg dose, and you add 5 mL of bacteriostatic water. Concentration is 50 ÷ 5 = 10 mg/mL. Volume per dose is 2 ÷ 10 = 0.2 mL. On a U-100 syringe that's 0.2 × 100 = 20 units, and the vial holds 25 doses.
GHK-Cu vials are larger than most
GHK-Cu is commonly supplied in considerably larger vial sizes than most compounds in this category, which changes the arithmetic in one practical way: the same water volume produces a much more concentrated solution, so unit readings come out small and a misread costs proportionally more.
The usual response is to reconstitute with a larger water volume than you would for a milligram-scale vial, which brings the readings back into a comfortable part of the syringe barrel. The calculator above shows how the two trade off.
Worth stating plainly: topical GHK-Cu is an established cosmetic ingredient, but injectable GHK-Cu has no regulatory approval in any major jurisdiction, and evidence from topical use establishes nothing about systemic administration.
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.