How much GHK-Cu did the studies use?

Why don't the study amounts make a dose for you?

A cream and a shot aren't alike. GHK-Cu amounts changed with the test, the animal, and the way it was given.

Dish tests used trillionths or billionths of a mole in each liter of liquid. Human skin work ranged from about 0.02% to hair spray with 50–100 milligrams per milliliter.

Animal work used shots, the nose, or the stomach. Those amounts were set for rodents by body weight, not for you.

Each amount and time comes from the named study. GHK-Cu isn't an approved drug for any illness.

These numbers tell you only what researchers tested, and they aren't directions for what you can use, how much you can use, or when you can use it at home.

Which GHK-Cu amount went with each kind of test?

The amounts below aren't a plan for you. They only show what each paper tested.

What did cell tests use? Human cells that make collagen got 10^-12 to 10^-9 M, about one part per trillion to one part per billion.

The biggest collagen change came at 10^-9 M ^[1]. That was a dish amount, not an amount for you.

Other skin-cell tests used 0.1–10 micromolar, or millionths of a mole per liter ^[5]. Rat skin cells changed repair work at billionth-of-a-mole amounts ^[2].

What did mouse tests use? The lung study gave mice belly shots on alternate days for 12 weeks.

The amounts were 0.2, 2, and 20 millionths of a gram for each gram of mouse weight per day ^[12]. That isn't a useful scale for choosing a human amount.

Older mice also got GHK, but the reviews didn't give the amount ^[10]. You can't use either mouse test to choose an amount for yourself.

What went on mouse skin? The hair test used GHK-Cu in an oil-and-water mix, but the paper summary didn't give the weight used ^[8].

Another study used a fat-like wound cover on burned mice ^[20]. A gel study held GHK-Cu fibers in a soft wound cover ^[13].

What did human trials use? Lee's 2016 hair trial used 50 and 100 milligrams per milliliter of spray for 6 months ^[7].

Leyden's 2015 skin work used cream and serum twice daily for 8–12 weeks. The paper placed the products in a 0.02–5% range but didn't give the exact amount ^[3].

Pickart's 2015 skin study ran for 12 weeks without giving the amount ^[5]. That missing fact makes the result harder to judge.

A human wound trial was still under way in 2026 on ClinicalTrials.gov, the U.S. trial register. The planned test didn't yet have an answer.

Study history isn't a safe plan. Animal and cell work can't tell you a personal amount.

How fast did animals clear GHK-Cu?

The best timing facts come from rodents, not people. The body can break this short chain of protein parts down fast.

After a vein dose: GHK lasted about 25–35 minutes in rodent blood. Blood enzymes split it, and the kidneys cleared it ^[18].

On skin: Some GHK-Cu stayed in outer and deeper skin for hours ^[18]. That was longer than its time in rodent blood.

Skin may hold a small store where you put the product. That doesn't mean all of it gets through.

Under the skin: Rodents had low blood amounts for 6–8 hours. The tests put the share reaching blood at 85–95% ^[18].

No sound human trial backs that kind of shot. You can't treat a rodent figure as a human one.

Into the belly: Mouse lung and brain tests used belly shots ^[10][12]. People don't normally get medicine that way.

By mouth: Rodents took in about 15–25% ^[18]. Stomach acid, the liver, and gut enzymes broke down much of the rest.

A special cover might protect more GHK-Cu. No good human test has shown that such a cover works.

In cream or serum: Glycolic, lactic, and salicylic acids can make GHK-Cu less steady. Some strong vitamin C products can do the same.

A fat-like tail and attached copper helped it stay whole and cross skin ^[18]. Even so, much of a product may remain near the surface.

Rodent blood time isn't your blood time. A human study must check how long GHK-Cu stays in people.

How did each study give GHK-Cu?

Four ways have been studied, and the proof isn't equal. For your choice, skin use has the most human work.

1. On skin: The tests used cream, serum, spray, soft gel, fat-like carriers, and tiny bits. You won't find all of those in an ordinary jar.

Human work covers collagen, hair, and one wound trial. Only a small share may cross your skin.

Needles and special carriers helped in lab or animal work ^{[8][18][20][21]}. You still don't have key human facts.

1. Under the skin: Rodent tests put blood entry at 85–95% for 6–8 hours ^[18]. You don't have a published human trial of this shot.

1. Into the belly: Mouse lung and brain studies used belly shots ^[12]. That isn't how you would normally receive care ^[10].

1. By mouth: Rodents took in about 15–25% ^[18]. Your stomach acid and gut enzymes can break GHK-Cu apart without a shield.

For more detail, read GHK-Cu dosage in research protocols and the peer-reviewed references. The table lets you match each test with its subject and amount.

What did each study use? Each row describes a test. You can't use a row as your plan.

You can't get your dose, timing, safety, or best route from rodent blood figures, and the rows won't answer what is safe for your body.