GHK-Cu CalculatorInjectable copper peptide: units, reconstitution and dosing chart
Turn the GHK-Cu dose on your prescription into units on a U-100 insulin syringe, for a 50 or 100 mg powder vial you reconstitute or a pre-mixed vial from a pharmacy. Injectable only; creams are not measured in units.
Draw to
4.8units
0.048 mL on a 0.3 mL U-100 syringe
- Concentration
- 25 mg/mL
- Per unit
- 250 mcg
- Dose
- 1,200 mcg
- Doses per vial
- 41
Tired of reconstituting?
Doctor-prescribed peptides from Peptides.build arrive already reconstituted by a licensed US 503A pharmacy, labeled and ready to draw. No BAC water, no math.
Copper peptide for skin and connective tissue.
Start your GHK-Cu visit · from $158/moQuick answer: how do you calculate GHK-Cu units?
To calculate GHK-Cu units, divide the milligrams in the vial by the millilitres of liquid to get the concentration, divide your prescribed dose in milligrams by that concentration to get the volume, then multiply the volume in mL by 100 for units on a U-100 syringe. GHK-Cu vials are large (50 or 100 mg) and doses are written in milligrams, so the draws are small. Example: a 50 mg vial with 2 mL of bacteriostatic water is 25 mg/mL, so if your prescription says 1.2 mg, you draw 0.048 mL, which is 4.8 units.
GHK-Cu dosing chart in units
Units to draw on a U-100 syringe for common GHK-Cu vial sizes and water volumes. Find your vial on the left and read across to the dose on your prescription. This is a conversion table, not a dosing recommendation; a dash means the dose is larger than the vial.
| Vial | Water | mg/mL | 500 mcg | 1 mg | 1.2 mg | 2 mg | 3 mg |
|---|---|---|---|---|---|---|---|
| 10 mg | 1 mL | 10 | 5 | 10 | 12 | 20 | 30 |
| 10 mg | 2 mL | 5 | 10 | 20 | 24 | 40 | 60 |
| 50 mg | 1 mL | 50 | 1 | 2 | 2.4 | 4 | 6 |
| 50 mg | 2 mL | 25 | 2 | 4 | 4.8 | 8 | 12 |
| 50 mg | 3 mL | 16.67 | 3 | 6 | 7.2 | 12 | 18 |
| 50 mg | 5 mL | 10 | 5 | 10 | 12 | 20 | 30 |
| 100 mg | 2 mL | 50 | 1 | 2 | 2.4 | 4 | 6 |
| 100 mg | 3 mL | 33.33 | 1.5 | 3 | 3.6 | 6 | 9 |
| 100 mg | 5 mL | 20 | 2.5 | 5 | 6 | 10 | 15 |
Values in units (U-100). 1 unit = 0.01 mL.
Pre-mixed GHK-Cu: reading the pharmacy label
GHK-Cu calculators online assume a 50 mg or 100 mg freeze-dried vial and 1 to 3 mL of bacteriostatic water, which gives very concentrated solutions (25 to 100 mg/mL) and draws of only a few units. A compounding pharmacy prescription usually arrives as a liquid at a lower, easier-to-measure strength, with the concentration printed on the label in mg/mL.
Divide your prescribed dose in mg by the label concentration to get mL, then multiply by 100 for units. At 10 mg/mL a 1.2 mg dose is 12 units, a comfortable draw on a 0.3 mL syringe. Switch the calculator above to Pre-mixed vial and type the label strength.
Expect the solution to be blue. GHK-Cu carries a copper ion, and a clear blue to blue-violet color is normal for the injectable; it is not a sign of contamination. Cloudiness or particles are a different matter and are a reason to call the pharmacy.
label: 10 mg/mL prescription: 1200 mcg (1.2 mg)
1.2 mg ÷ 10 mg/mL = 0.12 mL
0.12 mL × 100 = 12 unitsTired of reconstituting?
GHK-Cu prescribed through Peptides.build arrives already reconstituted by a licensed US 503A pharmacy, labeled with the concentration and ready to draw. Your provider tells you how many units.
Start your GHK-Cu visit · from $158/moHow much BAC water for 50 mg or 100 mg of GHK-Cu
Use the volume your pharmacy or prescriber specifies. The water changes only the concentration, never the amount of GHK-Cu in the vial: more water means more units for the same dose.
| Water | mg/mL | mcg per unit |
|---|---|---|
| 1 mL | 50 | 500 |
| 2 mL | 25 | 250 |
| 3 mL | 16.67 | 167 |
| 5 mL | 10 | 100 |
| 10 mL | 5 | 50 |
| Water | mg/mL | mcg per unit |
|---|---|---|
| 2 mL | 50 | 500 |
| 3 mL | 33.33 | 333 |
| 5 mL | 20 | 200 |
| 10 mL | 10 | 100 |
When GHK-Cu units are too small to read
A 100 mg vial mixed with 2 mL is 50 mg/mL, so 1 mg is only 2 units, and a 50 mg vial mixed with 1 mL puts 1 mg at 2 units as well. Draws that small are hard to measure on any standard syringe, and a half-unit error is a 25 percent dose error. The calculator flags draws under 2 units.
More water for the same vial fixes this: 50 mg in 5 mL is 10 mg/mL, so 1.2 mg becomes 12 units. Whether that is appropriate for your vial is a question for your pharmacist or prescriber; do not change the amount of water on your own. A 0.3 mL syringe, marked every unit or half unit, is easier to read for draws under 30 units.
New to syringe units? The general peptide calculator has a units-to-mL table and a side-by-side of 0.3, 0.5 and 1 mL syringes.
GHK-Cu calculator FAQ
How many units of GHK-Cu do I draw?
Units = dose (mg) ÷ concentration (mg/mL) × 100. For a 50 mg vial mixed with 2 mL (25 mg/mL), a prescription of 1.2 mg is 0.048 mL, or 4.8 units on a U-100 syringe. The dose itself comes from your prescription.
How much bacteriostatic water do I add to 50 mg of GHK-Cu?
Use the volume your pharmacy or prescriber specifies. The water does not change the amount of GHK-Cu, only the concentration: 1 mL makes 50 mg/mL (500 mcg per unit), 2 mL makes 25 mg/mL (250 mcg per unit) and 5 mL makes 10 mg/mL (100 mcg per unit). Peptides.build prescriptions arrive pre-mixed, so patients never add water.
How much bacteriostatic water do I add to 100 mg of GHK-Cu?
Follow the pharmacy's instructions. With 100 mg: 2 mL makes 50 mg/mL (500 mcg per unit), 3 mL makes about 33.3 mg/mL (333 mcg per unit) and 5 mL makes 20 mg/mL (200 mcg per unit). More water means more units for the same dose, which makes milligram doses easier to measure.
My GHK-Cu vial came pre-mixed. How do I convert my dose to units?
Read the concentration on the pharmacy label, for example 10 mg/mL. Divide your prescribed dose in mg by it to get mL, then multiply by 100: 1.2 mg ÷ 10 mg/mL = 0.12 mL = 12 units. Choose Pre-mixed vial in the calculator to do this automatically.
Why is my GHK-Cu solution blue?
Because of the copper. GHK-Cu is the peptide GHK bound to a copper ion, and the reconstituted solution is normally a clear blue to violet. Color is expected; cloudiness, particles or a sudden color change are not, and are a reason to contact the pharmacy.
Does this calculator work for GHK-Cu creams or serums?
No. Topical GHK-Cu is measured as a percentage of the cream or serum and applied by amount, not drawn in syringe units. This page is for the injectable only. If your prescription is topical, the pharmacy label and your provider's instructions tell you how much to apply.
How do I calculate GHK-Cu inside the Glow or KLOW stack?
The same way, one compound at a time. In a multi-compound vial each peptide has its own concentration (its mg ÷ the vial's mL), and the volume you draw for one compound delivers the others in the vial's ratio. A pre-mixed stack from a pharmacy prints each strength on the label, so you calculate from the compound your dose is written for and read the rest off.
How should GHK-Cu be stored once mixed?
Follow the storage line on the pharmacy label. Reconstituted peptides are typically kept refrigerated, not frozen, and used before the beyond-use date. Keep the vial out of direct light; the blue color is normal, but discard a vial that turns cloudy or grows particles.
Is GHK-Cu FDA-approved?
No. Injectable GHK-Cu is not FDA-approved for any use, and compounded medications are not FDA-approved. When it is prescribed, a licensed provider decides whether it is appropriate for the individual patient.
Is GHK-Cu allowed in competitive sport?
GHK-Cu is not named on the World Anti-Doping Agency Prohibited List, but the list's S0 category covers any pharmacological substance with no current approval for human therapeutic use, which can apply to non-approved peptides. Drug-tested athletes should check with their governing body before using it.
Does this calculator tell me how much GHK-Cu to take?
No. It performs arithmetic only and does not recommend a dose or schedule. The dose, timing and vial strength come from your prescription and pharmacy label.
Get GHK-Cu already reconstituted
A licensed US provider reviews a short online intake and sets your dose. A US 503A pharmacy prepares it, labels the concentration and ships it cold-chain, ready to draw.
This calculator performs arithmetic only. It does not recommend doses and is not medical advice. GHK-Cu is not FDA-approved, and compounded medications are not FDA-approved. Always follow the dose, concentration and schedule on your prescription and pharmacy label, and confirm any calculation with your pharmacist or prescriber before injecting.