What a GHK-Cu dose actually costs

Cost per dose is not cost per milligram

The price you pay is per vial. The thing you use is a dose. Those two units only line up when the dose divides cleanly into the vial contents, and often it does not.

The correct calculation is vial price divided by the number of whole doses the vial yields. Not vial price divided by total milligrams, then multiplied by dose size. The second method assumes you can use every last milligram, which is only true when the division comes out even.

When it does not, the leftover is stranded. It is real product, you paid for it, and it sits in the vial because there is not enough of it to make one more full dose. Stranded product is a cost, and it belongs in the per-dose figure.

What the table shows

Three things are worth pulling out of the computed rows above.

First, at a 2 mg dose both vial sizes strand nothing. Waste is 0 mg and 0 percent in each case, so the per-dose cost is simply the vial price split evenly across the doses.

Second, the 50 mg vial yields 25 whole doses and the 100 mg vial yields 50. The larger vial is not more efficient here, because neither vial is inefficient. It is twice as much product, so it buys twice as many doses. Whether it is cheaper per dose depends entirely on the price difference between the two sizes, a number this page does not have.

Third, because neither size wastes anything, the choice between them is not an arithmetic problem. It comes down to price where you are buying and how much product you want reconstituted at once.

When stranding does happen

A dose strands product whenever the vial contents are not a whole multiple of the dose. The vial divides as many full times as it can, and the remainder is left behind.

GHK-Cu is sold in 50 mg and 100 mg vials, and listings show doses of 1 mg, 2 mg and 3 mg. Not every combination of those divides cleanly. The table above covers the 2 mg case, which does. For any other dose, run the division yourself rather than assuming the result carries over.

Stranding gets worse as the dose grows relative to the vial, because the remainder is a bigger fraction of the total. There is no way to recover it. It is priced into every dose you did get out.

Water volume does not change the cost

GHK-Cu vials are commonly reconstituted with 1 mL, 2 mL or 3 mL of water. That choice changes concentration, which changes how many syringe units a dose occupies. It does not change how many milligrams are in the vial, so it cannot change how many whole doses the vial yields.

Cost per dose depends on milligrams in the vial and milligrams per dose. Water volume affects measurement only. A more dilute solution spreads a dose across more units, which makes small doses easier to draw accurately. A more concentrated one compresses it into fewer. Keep the handling question and the cost question separate when comparing products.

What this page does not tell you

GHK-Cu is not approved by any regulator for human use.

We hold no reliable human pharmacokinetic data for GHK-Cu. This site makes no claim about its half life, how long it takes to clear, or whether it accumulates. Everything above concerns concentration, volume and division only, and none of it implies that any dose interval is appropriate.

This page also does not tell you what dose to take, what to expect, what side effects occur, or whether GHK-Cu is safe or effective. There is no medical review behind this site. The dose sizes listed are the ones that appear in product listings, which is a statement about the market, not a recommendation. Take clinical questions to a clinician.

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 do I work out my cost per GHK-Cu dose?

Divide the vial price by the number of whole doses that vial yields at your dose size. For a 2 mg dose, that is 25 for a 50 mg vial and 50 for a 100 mg vial. Do not divide by total milligrams unless the dose divides evenly.

Is the 100 mg vial cheaper per dose than the 50 mg vial?

Not automatically. At a 2 mg dose neither vial strands anything, so both convert their full contents into usable doses. The 100 mg vial yields 50 whole doses and the 50 mg vial yields 25. Which is cheaper per dose depends purely on the price gap between them.

What does stranded product mean?

It is what is left in the vial after you have drawn every full dose you can, when the dose does not divide evenly. It is too little to make another dose, so it cannot be used. You paid for it, which is why it belongs in the per-dose cost.

Does using more water make the vial go further?

No. Reconstitution volume changes concentration, not the milligrams in the vial. A vial mixed with 3 mL contains the same amount of peptide as the same vial mixed with 1 mL and yields the same number of doses. Volume only affects how many syringe units a dose occupies.

How long does GHK-Cu stay active after a dose?

We have no reliable human pharmacokinetic data for GHK-Cu, so this site makes no claim about half life, clearance or accumulation. Any figure quoted elsewhere is not one we can verify. The calculations here cover concentration and volume only.