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GHK-Cu Cream Calculator

GHK-Cu is often blended into a cream, gel or serum rather than injected. The usual route is to reconstitute the vial with bacteriostatic water first, then stir a measured volume of that solution into the base. The figure that matters is the concentration of the finished mix — how much GHK-Cu sits in each gram once the added liquid is counted.

Status: GHK-Cu is a copper-peptide sold as a cosmetic raw material and a research compound; names here identify only what is being measured.

The formula

Solution concentration = GHK-Cu ÷ bacteriostatic water
GHK-Cu added = solution concentration × volume added
Finished amount = base + volume added
Concentration = GHK-Cu added ÷ finished amount

Worked example

Illustrative numbers only — not a strength recommendation.

Example
GHK-Cu in vial50 mg
Bacteriostatic water into vial2 mL → 25 mg/mL
Solution added to base2 mL (50 mg)
Carrier / base30 g → 32 g finished
Per gram1.56 mg/g (1,563 mcg/g)
Concentration0.156% w/w

Add only part of the solution for a weaker mix, or use less base for a stronger one. The 2 mL you add becomes part of the 32 g finished amount — leaving it out would overstate the concentration.

How to use the calculator

  1. Leave the mode on Reconstitute, then add to base (the default).
  2. Enter the GHK-Cu in the vial and the bacteriostatic water you dissolve it in — that sets the solution's mg/mL.
  3. Enter the volume of solution you add to the base, then the carrier / base amount (grams for % w/w, millilitres for % w/v).
  4. Read off the concentration as a percent and as mg per gram; optionally add an application size to see the GHK-Cu per use.

Weighing dry GHK-Cu straight into the base instead? Switch to the Dry powder into base mode, which skips the water and puts the whole vial into the base.

Open the topical calculator

Reconstituting GHK-Cu for injection instead? Use the GHK-Cu reconstitution calculator →

Frequently asked questions

How do I work out GHK-Cu cream concentration?
Divide the vial by the bacteriostatic water to get the solution's mg/mL, multiply by the volume you add to find the GHK-Cu that goes in, then divide by the finished amount (base plus the liquid you added). For example, 50 mg in 2 mL is 25 mg/mL; adding 2 mL moves 50 mg into 30 g of base, giving 32 g finished and about 1.56 mg/g, or 0.156% w/w.
Do I have to reconstitute GHK-Cu, or can I add the powder straight in?
Both are done, and the calculator has a mode for each. Reconstituting with bacteriostatic water first is the usual route — dissolve the vial, then add a measured volume of the solution, remembering that the liquid becomes part of the finished mix. If you instead weigh dry GHK-Cu straight into a weighed base, switch to the dry-powder mode. The reconstitution calculator also covers the dissolving step on its own.
What does a 1% GHK-Cu concentration mean in milligrams?
A 1% w/w concentration is 10 mg of GHK-Cu per gram of finished product, because 1% by weight always equals 10 mg/g. So the percent is simply the milligrams-per-gram figure divided by ten, and 0.5% would be 5 mg/g.
Does mixmypep recommend a GHK-Cu strength?
No. The calculator only performs arithmetic on the amounts you enter to report the resulting concentration. It does not suggest a target percentage, a carrier, or how any preparation should be applied.

More calculators

Topical Peptide Cream Calculator
The general concentration calculator for any peptide in a base.
BPC-157 Cream Calculator
Concentration and mg/g for BPC-157 mixed into a base.
GHK-Cu Reconstitution Calculator
Concentration and units for GHK-Cu reconstituted for injection.
Bacteriostatic Water Calculator
How much water to add, and the concentration you'll get.
mcg vs mg vs Units (IU)
What each measurement means and how they relate.
All peptide calculators →
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