GHK-Cu dosage chart: how many units on the syringe

How to read the chart

The table above is built from one vial size, 100 mg, and three water volumes: 1 mL, 2 mL and 3 mL. Pick the row that matches the vial you have and the amount of bacteriostatic water you put into it. The last column is the number of units to draw on a U-100 insulin syringe.

A U-100 syringe is marked so that 100 units of volume equals 1 mL of liquid. That is the only reason the chart works. The syringe does not measure milligrams. It measures volume, and the concentration you created when you added water is what turns that volume back into a mass of peptide.

Two patterns are worth noticing. At 1 mL of water the concentration is 100 mg/mL, and the unit count happens to equal the dose in milligrams: 1 mg is 1 unit, 2 mg is 2 units, 3 mg is 3 units. That coincidence only holds at that one water volume. At 2 mL the concentration drops to 50 mg/mL and every unit count doubles. At 3 mL the concentration is 33.33 mg/mL and the counts step up again.

Why the unit numbers here are small

Every result in this chart falls between 1 unit and 9 units. That is a narrow band at the very bottom of a U-100 barrel, where the printed graduations are closest to the plunger and hardest to line up by eye.

The practical consequence is arithmetic, not medicine. The smaller the volume you are trying to measure, the more a small error in plunger position changes the mass of peptide you actually drew. Using more water for the same vial pushes the same dose further up the barrel, which is why the 3 mL rows produce the largest unit counts for identical milligram doses.

This site does not tell you which water volume to choose. That is a decision with no correct answer we can compute for you, because it depends on what you are trying to measure and what your syringe can resolve.

More water does not change the dose

The mass of peptide in a vial is fixed at the point it was manufactured. A 100 mg vial contains 100 mg whether you add 1 mL of bacteriostatic water or 3 mL. Water is a diluent. It sets how much liquid that fixed mass is spread through, and nothing else.

So when the chart shows 6 units for one row and 3 units for another at the same milligram dose, those are the same amount of GHK-Cu in different volumes of liquid. The row with more units is not a larger dose. Reading a unit count as if it were a dose is the single most common way this conversion goes wrong.

The reverse error matters too. If you mix a vial with one water volume and then read units off a chart built for a different water volume, the mass you draw will not be the mass you intended, even though the syringe reading looks correct.

This chart is for a 100 mg vial only

GHK-Cu is sold in more than one vial size. The computed table on this page covers the 100 mg vial. If the vial in front of you holds a different amount of peptide, none of these rows apply, because the concentration for a given water volume is different and every unit count changes with it.

Check the label before you use any row. Vial size, water volume, dose. All three inputs have to match, or the output is a number for someone else's vial.

What is not known about GHK-Cu

GHK-Cu is not approved by any regulator for human use. We hold no reliable human pharmacokinetic data for it. That means this site makes no claim about its half life, how long it takes to clear, whether it accumulates with repeated administration, or how any of that would interact with a dosing schedule.

The dose amounts of 1 mg, 2 mg and 3 mg in the chart are figures that appear in vendor listings. They are inputs to a volume calculation. They are not a recommendation, and their presence here is not evidence that any of them is appropriate, effective or tolerated.

This page has no medical review. It cannot tell you what dose to use, how often to use it, what effects to expect, what side effects occur, or whether GHK-Cu is safe. Those are clinical questions, and a conversion table is not equipped to answer them. Anyone who needs those answers needs a clinician, not arithmetic.

What we do not know

We hold no reliable human pharmacokinetic data for GHK-Cu, so this site makes no claims about its half life, how long it takes to clear, or how it accumulates. The arithmetic below concerns concentration and volume only.

This page answers arithmetic and handling questions. It does not tell you what dose to take, what to expect, or whether anything is appropriate for you, and there is no medical review behind it.

Common questions

How many units is 2 mg of GHK-Cu?

It depends entirely on how much water is in the vial. From a 100 mg vial in 1 mL, 2 mg is 2 units on a U-100 syringe. From the same vial in 2 mL it is 4 units, and in 3 mL it is 6 units. All three are the same mass of peptide.

Does adding more bacteriostatic water make GHK-Cu weaker?

It lowers the concentration, not the dose. A 100 mg vial in 1 mL is 100 mg/mL, in 2 mL it is 50 mg/mL, and in 3 mL it is 33.33 mg/mL. To get the same milligram dose from a lower concentration you draw more volume, which is why the unit counts rise.

What does U-100 mean on a syringe?

It describes the scale printed on the barrel. A U-100 syringe is graduated so that 100 units of volume equals 1 mL. The markings count volume, not milligrams of peptide, so a unit reading only means something once you know the concentration in the vial.

My vial is not 100 mg. Can I still use this chart?

No. The table is computed for a 100 mg vial. A different vial size gives a different concentration at the same water volume, so every unit count changes. Use a chart built for the vial size printed on your label.

How often should GHK-Cu be administered?

This site cannot answer that. We hold no reliable human pharmacokinetic data for GHK-Cu, so we make no claim about its half life, clearance or accumulation, and nothing here supports a frequency. Scheduling is a clinical question and this page has no medical review.

Is GHK-Cu safe?

We do not answer that here. GHK-Cu is not approved by any regulator for human use, and this page is a volume conversion tool with no medical review behind it. Questions about safety, side effects or whether it works should go to a clinician.