With 2 mL bacteriostatic water
2.0 units
Page last checked
Reconstitution · GHK-Cu
GHK-Cu dosage calculator
Pick the vial, the water you added and the dose. Get the exact draw in units for the syringe in your hand.
Step 1 of 4
- total mg in the calculation
- mL used in the calculation
- mcg
This vial holds 50,000 mcg in total.
- match the size on the package
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
Draw to
3.0units
3.0 units on a U-100 insulin syringe · 1 mL · lines every 2 units, which is 0.03 milliliters. The nearest syringe line is 4 units.
50 mg ÷ 3 mL = 16.67 mg/mL
→ 167 mcg/unit · 500 mcg = 0.030 mL = 3.0 units
→ 167 mcg/unit · 500 mcg = 0.030 mL = 3.0 units
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Show the math and syringe details
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How to use the calculator
- 1
Enter the amount in the vial
- 2
Enter the water you added
- 3
Enter the dose you want to convert
GHK-Cu is a peptide three amino acids long holding a copper ion. It was pulled out of human blood plasma in 1973. It is sold for skin — wrinkles, firmness, scars — and for hair regrowth, and now increasingly as an injection.
Almost everything published is a cream on the surface of the skin. Where that work was blinded and measured objectively, the copper peptide did no better than its control. A 2026 review of injectable peptides says the dose, the frequency and the indications for injecting this one all remain unknown.
Examples using 50 mg of GHK-Cu
Each row uses 50 mg and the liquid volume shown. Dividing the amount by that volume gives the calculated concentration. The rows are arithmetic examples, not alternative product preparations.
◆ How liquid volume changes the resultdose used: 500 mcg
With 3 mL bacteriostatic water
3.0 units
With 5 mL bacteriostatic water
5.0 units
| Bacteriostatic water | Concentration | Per U-100 unit | Draw for 500 mcg | Nearest syringe line |
|---|---|---|---|---|
| 2 mL | 25.00 mg/mL | 250.0 mcg | 2.0 u · 0.020 mL | exactly 2 u |
| 3 mL | 16.67 mg/mL | 166.7 mcg | 3.0 u · 0.030 mL | 4 u · 33.3% off |
| 5 mL | 10.00 mg/mL | 100.0 mcg | 5.0 u · 0.050 mL | 6 u · 20.0% off |
The amount, liquid volume and dose shown here are the calculator’s starting example for GHK-Cu. Replace them with your own values. Every result in the table is calculated from those inputs.
GHK-Cu: why a large vial can give a small draw
The GHK-Cu preset holds a large vial amount, yet its starting example gives a small draw. The vial total and the amount in one draw are different quantities. Reading them separately explains the result.
Open the mixing details3 notes
More in the vial can mean less liquid per draw
With the same water volume, a stronger vial has more GHK-Cu in each milliliter. It takes less liquid to give the same amount. The total in the vial does not tell you how far to draw up the syringe on its own.
The three water presets show how this relationship changes. They are examples for the math, not instructions to choose the largest volume. The actual preparation needs its own mixing instructions.
Check the gap between the syringe lines
At the starting amount, the GHK-Cu examples sit near the start of the scale. In that part of the barrel, the gap between two lines can be a large share of the target volume.
The target and nearest line may differ. The rounding result shows that gap. Extra decimal places on the screen do not add finer lines to the syringe. Nor can the color of a mixture confirm its strength or contents.
A cream percentage is not a syringe dose
The topical studies discussed in the guide used a different preparation and route. A percentage states how much of a mixture is made up of one ingredient. It does not, by itself, state how much a person received.
That percentage cannot set an amount to inject. The calculator needs an amount and a liquid concentration to find a draw. It cannot show that a result from a cream also applies to an injection.
The quoted GHK amount is an estimate, not a human dosing result
A commonly cited review estimates a possible human amount for GHK from earlier work. It does not report giving that amount to people as GHK-Cu. An estimate is not a tested injection dose.
Read the supporting evidence3 supporting notes
The name and preparation need to match
GHK and GHK-Cu are not the same study material. A mixture may also contain other ingredients. A finding about one of these does not tell you the strength of another vial or what that mixture will do.
Local tissue studies do not establish a whole-body schedule
A scalp, skin or other local application answers a different question from routine systemic injection. The site of delivery and the study preparation matter alongside any quantity. A syringe calculation cannot resolve those differences.
A precise conversion does not make the estimate precise
The math may return a clear liquid volume from the values entered. That precision comes from division. It does not make an estimated dose more reliable or tell you how long the contents of a mixed vial will keep.
The name and preparation need to match
GHK and GHK-Cu are not the same study material. A mixture may also contain other ingredients. A finding about one of these does not tell you the strength of another vial or what that mixture will do.
Local tissue studies do not establish a whole-body schedule
A scalp, skin or other local application answers a different question from routine systemic injection. The site of delivery and the study preparation matter alongside any quantity. A syringe calculation cannot resolve those differences.
A precise conversion does not make the estimate precise
The math may return a clear liquid volume from the values entered. That precision comes from division. It does not make an estimated dose more reliable or tell you how long the contents of a mixed vial will keep.
Units to dose at 16.67 mg/mL
Mix 50 mg into 3 mL and one U-100 unit carries 166.7 mcg. The table shows how much peptide is in each numbered syringe line. These are conversion examples, not suggested doses.
Open the unit conversion table10 rows
| U-100 line | Volume | Mass (mcg) | Mass (mg) |
|---|---|---|---|
| 10 u | 0.10 mL | 1,667 mcg | 1.667 mg |
| 20 u | 0.20 mL | 3,333 mcg | 3.333 mg |
| 30 u | 0.30 mL | 5,000 mcg | 5 mg |
| 40 u | 0.40 mL | 6,667 mcg | 6.667 mg |
| 50 u | 0.50 mL | 8,333 mcg | 8.333 mg |
| 60 u | 0.60 mL | 10,000 mcg | 10 mg |
| 70 u | 0.70 mL | 11,667 mcg | 11.667 mg |
| 80 u | 0.80 mL | 13,333 mcg | 13.333 mg |
| 90 u | 0.90 mL | 15,000 mcg | 15 mg |
| 100 u | 1.00 mL | 16,667 mcg | 16.667 mg |
How the math works
- Concentration — divide the amount entered by the liquid volume used in the calculation: mg ÷ mL = mg/mL. This tells you how many mg are in each mL.
- Volume — the dose divided by that concentration: dose ÷ (mg/mL) = mL.
- Units — on a U-100 syringe one unit is 0.01 mL, so mL × 100 = units. A U-40 unit is 0.025 mL, so the wrong barrel is a 2.5× error. That is why the calculator asks which one you have.
- Rounding gap — the exact draw against the nearest syringe line: |exact − nearest line| ÷ exact × 100 = % difference.
Useful guides for this calculation
The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.