Library/For Skin/GHK-Cu

OTC · CosmeticFor SkinTopical1973 origin+2 more★ Popular

GHK-Cu

A copper-bound tripeptide first isolated from human plasma in 1973. We read all 60 studies. The protocol is below.

Updated 19 May 2026Read 13 minEvidence ●●●○○Citations 60

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Free — puts GHK-Cu on your decision board.

The GHK-Cu Report · $19

Everything you need to start: dose, sourcing, safety, our verdict.

One purchase · yours forever

Built from 60 cited studies.

Status

OTC

Class

For Skin

Evidence

3/ 5●●●○○

Year first isolated

$19 ↓

Topical RCTs

$19 ↓

Injectable human RCTs

$19 ↓

Read this if

you're a Caroline Hirons / NIOD / Skinceuticals reader and want the honest read on copper peptides
your derm sent you home with it after laser, microneedling, or a chemical peel
you've heard lifters mention injectable GHK-Cu and want to know whether to ignore them
**topical or injectable** — buy the topical; the injectable is sold on the topical's evidence, not its own

Skip this if

you're trying to inject this for tendon recovery — that's not what the data is
you have a copper allergy or Wilson's disease
you want a retinoid-tier effect — it's a complement, not a replacement
you're going to layer it in the same step as L-ascorbic acid, AHA/BHA, or a high-strength retinoid — **the copper-peptide complex destabilizes on contact with those actives**

The 4 ways you can buy GHK-Cu

Cosmetic-grade; the bulk of GHK-Cu evidence is for topical use. Concentrations often undisclosed a…

Compounded 503A

⚠

$100–$350/mo

Pharmacy-grade; reconstituted product should turn blue-green.

RUO (research-only)

✓

Sold 'for research only'

$40–$120/mo

Vendors frequently sell GHK (no copper) labeled as GHK-Cu at the same price; the blue-green color …

Gray market

✓

Unregulated overseas import

$2–$6/mo

Cheapest molecule on the gray-market list. Same upstream as RUO; the per-mg cost is roughly 1/10 o…

Click any lane for the full Sourcing breakdown. Prices and lane availability vary by molecule — this is the per-peptide snapshot, not a generic table.

First 90 days · GHK-Cu

What we'd actually do

Weeks 1–2

Tolerability check. Mild contact irritation or transient redness is normal for the first 1–2 weeks. Stop and patch-test if you get persistent dermatitis.

Weeks 4–8

Texture changes if it's going to work. Take a baseline photo at week 0 — week 8 vs baseline is the honest comparator. Your memory of how your skin looked is unreliable.

Week 12 — decide

Side-by-side photo decision. Cosmetic peptide effects are slow and modest. Anyone promising fast dramatic results is selling marketing, not skin biology.

Quit if

Persistent contact dermatitis or worsening irritation.
No perceived change in week 8 and week 12 photo comparisons (cosmetic peptides usually take longer than 12 weeks, but at 16 weeks if nothing has changed, the formulation isn't reaching the target).
Any pigmentation changes that persist after stopping.

Identity

What it is.

GHK-Cu is a tiny — just three amino acids (glycine-histidine-lysine) — bound to a single copper ion. It was first isolated from human plasma by Loren Pickart in 1973. Levels in the bloodstream drop with age, which is the hook a lot of the marketing hangs on.

It's been studied for fifty years, mostly for skin: wound healing, collagen synthesis, hair follicle activity, and antioxidant signaling. Unlike most peptides we cover, it has a real history in topical cosmetic formulations and a body of human dermatology research that isn't just one Croatian lab.

The most common form is a serum or cream applied to the skin. Injectable GHK-Cu exists in the research-chemical market, but the topical evidence is what's actually been studied in humans.

TL;DR

TL;DR. 30-second version.

The compressed verdict — what GHK-Cu actually is, what the human evidence shows, and the watch-for in three bullets. Locked.

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Mechanism

Mechanism.

Mechanism · in the GHK-Cu report

How the molecule actually works — receptor profile, downstream signaling, what to expect mechanistically.

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Evidence

Evidence. What we actually know in humans.

Evidence · in the GHK-Cu report

The trial breakdown — phase, n, primary endpoint, who funded, what hit, what didn't.

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Human-Evidence Factbox

Year first isolated

$19 ↓

Topical RCTs

$19 ↓

Injectable human RCTs

$19 ↓

Animal studies

$19 ↓

Years on cosmetic shelves

$19 ↓

INCI to look for (topical)

$19 ↓

Stable color check (topical + injectable)

$19 ↓

Don't co-apply with

$19 ↓

COA red flag (RUO injectable)

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COA green flag (RUO injectable)

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Major adverse events flagged

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Dose

Dose. The actual protocol.

Dose · in the GHK-Cu report

The specific protocol — dose, titration schedule, cycle pattern, frequency, route.

We read 60 studies to write this report.

Get the report · $19 ↓

Sourcing

Sourcing. Where the cohort actually buys.

Sourcing · in the GHK-Cu report

Sourcing breakdown — vendor methodology, red flags, our published test results, COA checklist.

We read 60 studies to write this report.

Get the report · $19 ↓

Safety

Safety. Side effects.

Safety · in the GHK-Cu report

The watch-for list — contraindications, drug interactions, monitoring labs, when to stop.

Get the report · $19 ↓

Editorial Position

Editorial position.

Editorial Position · in the GHK-Cu report

Our editorial position — explicit yes / no / depends, with the reasoning behind it.

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Citations

Citations.

+Show all 60 citations

The GHK-Cu Report · $19

Everything you need to start.

Dose, sourcing, safety, our verdict. One purchase. Yours forever.

Built from 60 cited studies.

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