GHK-Cu Reconstitution & Dosage Calculator

This calculator does one job. It turns your vial size, the amount of BAC water you add, and your target dose into three numbers: concentration in mg/mL, the volume you draw in mL, and the matching units on a U-100 insulin syringe.

GHK-Cu ships as a freeze-dried powder. Before it can be drawn into a syringe, it has to be mixed with bacteriostatic (BAC) water. The amount of water you add sets the concentration, and the concentration decides how many units you draw.

GHK-Cu doses are small, often under 2 mg, so you can enter your dose in mg or mcg. A clear blue or blue-green color in the mixed vial is normal. That color comes from the copper in the peptide and does not mean the vial is bad.

The easiest path is to use the GHK-Cu preset dropdowns first. Pick the vial setup that matches your research vial, then pick the common dose you want to calculate. The custom steps are only there when your vial size, BAC water volume, or target dose does not match a preset.

The math is short. Concentration is vial size divided by BAC water. Draw volume is target dose divided by concentration. U-100 units are milliliters multiplied by 100.

Here is one example. A 50 mg vial with 2.5 mL of BAC water gives 20 mg/mL. A 2 mg dose is 2 divided by 20, which is 0.10 mL, or 10 units. Add only 2 mL to that same vial and you get 25 mg/mL, so 2 mg becomes 0.08 mL, or 8 units. Same peptide, different volume.

Common research protocols discuss GHK-Cu in the 0.5 to 2 mg range per injection, sometimes up to 3 mg, on a cycle of several weeks. We list these numbers because people search for them. This is not a dose recommendation, and the calculator does not tell you which dose to use.

Below is how those mg values convert to U-100 syringe units at two common research concentrations. Remember 1 mg equals 1000 mcg, so a 0.5 mg dose is the same as 500 mcg.

GHK-Cu doses are small, so some sources write them in mcg instead of mg. They mean the same thing: 1 mg is 1000 mcg. A 1000 mcg dose and a 1 mg dose are identical. The calculator accepts either, so enter whichever your source uses.

Once mixed, GHK-Cu turns the solution clear blue or blue-green. That is the copper showing, and it is expected. Throw a vial out only if it turns cloudy, grows particles, or changes to an odd color.

Add the BAC water slowly down the side of the vial, not straight onto the powder. Swirl gently or roll the vial between your hands. Do not shake, because shaking makes foam and you cannot draw an accurate dose through bubbles. Some lots dissolve slowly, so give it a minute.

Keep the dry powder cold and dark. After mixing, store the vial in the refrigerator and use it within about 4 weeks. Do not freeze a mixed vial. A 50 mg vial gives 50 doses at 1 mg or 25 doses at 2 mg, so match your vial size to how much you plan to use before the 4-week window closes.