Page last checked
Reconstitution · GHK-Cu
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
This vial holds 50,000 mcg in total.
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
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.
Your address is used to send this one card. The email also includes an optional link for updates when our data changes. Nothing else is sent unless you choose that link, and you can unsubscribe anytime.
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.
Each row starts with the same 50 mg vial and changes only the amount of water. More water makes the mixture less concentrated, so the same dose uses more syringe units.
| Water added | 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 vial, water 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.
This vial holds many times the powder of a typical peptide vial, and it produces some of the smallest draws on the site. Both come from the same fact, and they pull against each other.
Even with the largest offered water volume, the solution stays highly concentrated. A typical amount falls within the first few syringe marks, where one mark changes the draw substantially.
The larger water option moves a small dose farther up the syringe, making the reading easier without changing the dose.
GHK-Cu is a short peptide holding a copper ion, and copper in solution is blue. A vial that turns blue on mixing has done what the chemistry says it should.
That is worth saying only so the color does not read as a fault. It is not a purity check and not a strength check in either direction. It is simply what this molecule looks like dissolved.
Nearly all the published human work on this molecule is a cream applied to skin, and its strengths are quoted as percentages of a preparation.
A percentage describes a mixture, not the amount a person received. It cannot be converted into a syringe draw without more information.
People do ask what to inject, and a single number answers them across the internet. It is an author’s estimate, printed in a review. The listed employer of the person making it sells copper peptides for skin. Set beside the vial, the figure is not close to what this table works with.
The sentence people quote begins with the authors estimating. They reached the figure by inference from injections given to animals. An estimate is a judgment about what might work. It is not a record of what anyone received.
Two published studies between them cover many thousands of scalp injections. One ran monthly for months in a very large group of men. The other ran every three weeks in a group of a thousand patients.
The scalp work put it into skin. The animal work put it into the abdominal cavity of mice, into a rat knee joint, and into a chamber implanted under a rat’s skin.
The two large studies dosed monthly, or every few weeks. Intervals that long change what a mixed vial is. It stops being a week’s mixing and becomes something standing in a fridge for months.
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.
| 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 |
The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.