GHK-Cu Dose Calculator
GHK-Cu vials are far larger than GLP-1 vials and the dilution is usually different. Enter the vial, the water and your dose to get the right mark on the syringe.
Water doesn't change the dose — it changes how many units the dose takes up.
U-100 and U-50 share the same scale — 100 units per mL. The U-50 just has half the barrel (0.5 mL), so it stops at 50. The U-40 marks 40 units per mL, which is a different scale. Check what's printed on yours.
Fill in the vial, the water and the dose to see the result.
Personal journal. Not medical advice.
How the GHK-Cu calculation works
50 and 100 mg vials with doses of a few milligrams: here the water is what separates a readable mark from a tiny one. The steps below use a 50 mg vial in 5 mL.
Concentration
Milligrams in the vial ÷ mL of water = how many mg sit in each mL.
vial ÷ water = concentration50 mg ÷ 5 mL = 10 mg/mLVolume per dose
Dose ÷ concentration = how many mL you need to draw.
dose ÷ concentration = mL2 mg ÷ 10 = 0.2 mLUnits on the syringe
mL × 100 on a U-100 or U-50 syringe (or × 40 on a U-40) = the mark to stop at.
mL × 100 = units0.2 mL × 100 = 20 unitsThe whole thing in one formula
units = dose ÷ (vial ÷ water) × 100Vial in mg, water in mL, dose in mg. The 100 covers U-100 and U-50; swap it for 40 if your syringe is a U-40.
A 50 mg vial with 5 mL of water gives 10 mg/mL. A 2,000 mcg dose takes up 0.2 mL — that's 20 units on a U-100 syringe.
The conversions people look up
How many units is 2 mg of GHK-Cu?
20 units on a U-100, with a 50 mg vial reconstituted in 5 mL.
And 1 mg and 3 mg?
10 and 30 units in the same vial.
How many mcg is 2 mg?
2000 mcg. GHK-Cu doses show up in both units depending on the source.
Does a 100 mg vial change the math?
Only if the water changes with it. 100 mg in 10 mL gives the same 10 mg/mL as 50 mg in 5 mL — and the same marks.
Units by dose and dilution
A 50 mg vial on a U-100 syringe. Columns are the water you used to reconstitute.
| Dose | 3 mL | 5 mL | 10 mL |
|---|---|---|---|
| 1,000 mcg | 6 | 10 | 20 |
| 2,000 mcg | 12 | 20 | 40 |
| 3,000 mcg | 18 | 30 | 60 |
GHK-Cu in context
GHK-Cu is a tripeptide (glycyl-L-histidyl-L-lysine) bound to a copper ion. That copper is what gives the reconstituted solution its characteristic blue colour — if your vial didn't turn blue after adding water, it's worth questioning what's in it.
It's well known as a topical cosmetic ingredient, in serums and creams. The injectable form is research territory: it has no approval as a medicine and the doses in circulation come from informal protocols, not from a label. This page doesn't recommend using it — it just solves the math for people who already do.
Practically, GHK-Cu inverts the usual scale. Where a semaglutide vial holds 5 or 10 mg, GHK-Cu vials come with 50 or 100 mg, and reconstitution uses larger volumes — 5 or 10 mL. High concentrations with doses of a few milligrams produce small marks on the syringe, so the choice of water matters more here than with almost any other compound.
Do this math once. Once.
In PepPro you enter the vial and the water a single time. From then on the app works out every injection on its own, shows the units on a visual syringe, reminds you at the right moment and keeps the whole history.
- Your reconstitution stays saved per vial
- Exact units on a visual syringe before you inject
- Reminders, titration and injection-site rotation
- Full history of doses, weight and how you feel
Exact units on a visual syringe before you inject
Good question. We've got answers.
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It's the usual advice for any reconstituted peptide, and it counts for more here: the vial is large and lasts months. Refrigerated, in its box or wrapped, away from direct light — and keep an eye on the colour, which should stay blue and clear.
The copper. GHK-Cu is the GHK tripeptide complexed with a copper (II) ion, and copper complexes in solution are blue. A colourless solution after reconstitution is a reason to question what's in the vial.
5 mL is the most common volume and gives 10 mg/mL — a 2 mg dose sits at 20 units, comfortable to read. With 3 mL (16.7 mg/mL) that same dose would land on 12 units; with 10 mL it would rise to 40. All of them work; only the reading precision changes.
Same molecule, but not the same product or the same dose. Cosmetic serums and creams carry GHK-Cu at very low concentrations for the skin; the injectable form is research-grade and has no approval as a medicine. One doesn't validate the other.
Twenty-five injections at 2 mg, or fifty at 1 mg. Large vials last months, which makes recording the reconstitution date and the storage conditions more important than with vials that run out in three weeks.
Yes — that's exactly what PepPro is for. Enter the vial and the reconstitution once and the app takes over: it works out every injection, shows the units on a visual syringe, reminds you when it's time and keeps the history of doses, weight and how you feel.
No. PepPro is a personal journal and this calculator is an educational tool. Nothing here replaces a qualified healthcare professional — they're the one who decides whether, how much and how you should use any compound.
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Personal journal. Not medical advice.
Disclaimer
This calculator is 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.