The Ordinary Copper Peptide Serum: Reading the Whole Label

The Ordinary’s Multi-Peptide + Copper Peptides 1%
lists Copper Tripeptide-1 at the fourth position on a long label, with 1%
disclosed. The hero is genuinely near the top and the brand tells you the
concentration — which is more than most copper peptide serums do. The
story is not a buried active. It is what fills the positions below it, and one
small ingredient near the bottom that decides whether any of it reaches your
skin.

Most of the “read the label” pieces we write here end with the
marketed hero sitting embarrassingly far down the ingredient list, somewhere
below the preservatives. This one does not, and that is exactly why it is worth
reading. The Ordinary put the copper peptide where it belongs and told you how
much is in there. So the interesting question changes. When the active is real
and the concentration is honest, what does the rest of a very long
label tell you?

We read every name on the label, top to bottom. Here is what it says.

Where does the copper peptide actually sit?

Here is the full list, quoted verbatim as it appears on the product page at
Ulta,
read on 29 August 2026 (a matching list appears at another major retailer,
dated 15 August 2026):

Aqua (Water), Glycerin, Lactococcus Ferment Lysate, Copper Tripeptide-1, Acetyl Hexapeptide-8, Pentapeptide-18, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Palmitoyl Tripeptide-38, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Acetylarginyltryptophyl Diphenylglycine, Sodium Hyaluronate Crosspolymer, Sodium Hyaluronate, Allantoin, Glycine, Alanine, Serine, Valine, Isoleucine, Proline, Threonine, Histidine, Phenylalanine, Arginine, Aspartic Acid, Trehalose, Fructose, Glucose, Maltose, Urea, Sodium PCA, PCA, Sodium Lactate, Citric Acid, Hydroxypropyl Cyclodextrin, Sodium Chloride, Sodium Hydroxide, Butylene Glycol, Pentylene Glycol, Acacia Senegal Gum, Xanthan Gum, Carbomer, Polysorbate 20, Dimethyl Isosorbide, Sodium Benzoate, Caprylyl Glycol, Ethylhexylglycerin, Phenoxyethanol, Chlorphenesin.

Copper Tripeptide-1 — GHK-Cu, the molecule the whole product is named
after — is fourth on the list, right behind water, glycerin and a
postbiotic ferment. The label states 1%. On a label, where things are ordered
roughly by weight down to about the 1% mark, fourth place with a disclosed
percentage is close to the best a shopper can hope for. The copper is there,
near the top, and you are told how much. Credit where it is due.

Marketed hero

Copper Tripeptide-1 (GHK-Cu)

Position on label

Fourth from the top

Concentration disclosed?

Yes — 1% stated on the label

Source of list

Ulta product page, read 29 Aug 2026; corroborated at a second major retailer, 15 Aug 2026

The reason copper peptides get talked about at all is that the biology is not
imaginary. In a review of the GHK-Cu literature, Pickart and Margolina describe
the peptide stimulating fibroblast activity and collagen and elastin
production in skin, with small clinical studies reporting improved skin density
over twelve weeks of use
(Pickart & Margolina, 2018).
That is a genuine evidence base, and it is why the ingredient is worth putting
near the top of a label rather than a fingernail of it near the bottom. So far,
so good.

What fills positions 15 to 29?

This is where the label gets more talkative. Positions fifteen through
twenty-five are eleven amino acids in a row: glycine, alanine, serine, valine,
isoleucine, proline, threonine, histidine, phenylalanine, arginine and aspartic
acid. Positions twenty-six through twenty-nine are four sugars: trehalose,
fructose, glucose and maltose. Add urea and the sodium PCA / PCA / sodium
lactate cluster just after, and a large stretch of the middle of this formula is
one thing: Natural Moisturizing Factor components.

None of that is a bad ingredient. NMF compounds are the humectants your own
skin already uses to hold water at the surface, and they do a real, modest job.
But a couple of points are worth saying plainly. First, they are among the cheapest
inputs in a cosmetic chemist’s cabinet — amino acids and simple sugars are
commodity bulk. Second, a long stretch of the label — roughly a third of
every slot on it — is taken up doing surface hydration that a much shorter
humectant system could cover. That is not deception. It is a formula padded out
with inexpensive, plentiful material, and the label makes it plain.

Can the copper peptide actually get where it needs to go?

Here is the part of the label that made us stop. A GHK-Cu molecule is small
— about 340 daltons, under the rough 500-dalton ceiling for passive skin
penetration — but it is also charged, and charged peptides struggle to
cross intact skin regardless of size. Work summarised by specialist writers
citing Li and colleagues describes near-zero permeation of GHK-Cu through intact
human skin without help, with meaningful amounts reaching the dermis only after
the skin barrier was physically breached
(research summary, EvenSkyn, 2026;
the underlying primary source is Li et al. in Pharmaceutical Research).

So the single dedicated penetration enhancer on the label matters a great deal.
Dimethyl Isosorbide sits at position forty-four — below the
thickeners, below the emulsifiers, near the very end of the label.
Penetration enhancers of that type are commonly used at something like 10–20%
to genuinely shift a hard-to-absorb active across the barrier. At position
forty-four, the amount present is almost certainly far lower than that.

We are careful here: you cannot read an exact percentage off a list, and at a
low level Dimethyl Isosorbide may be doing a perfectly sensible job as a
solubiliser for other ingredients rather than as a delivery vehicle for the
copper. What the label can tell you is that this formula does not appear to lean
hard on penetration enhancement to carry GHK-Cu into the skin. Whether that
matters for the result is an open question the ingredient list cannot close.

Is the preservative system the real irritation story?

The last five names on the label — sodium benzoate, caprylyl glycol,
ethylhexylglycerin, phenoxyethanol and chlorphenesin — are the
preservative system, and phenoxyethanol is the name ingredient-savvy communities
argue about most. Copper peptides themselves can, in a minority of people, cause
mild transient irritation, and copper contact allergy is real but uncommon, so a
patch test is sensible for anyone with metal-sensitive skin
(GHK-Cu tolerability overview, Klow, 2026).

The point worth holding onto is that when someone reports a serum “broke
me out,” the peptide is not automatically the culprit. A stack of five
preservatives is a more common source of reactive skin than a well-tolerated
tripeptide. If you are sensitive, patch-test on the inner forearm for a few days
before it goes near your face — and if you react, the preservative block
gives you several other suspects before you blame the copper.

So is it worth it, and what does a different formula look like?

On its own terms, this is an honest product. The active is real, near the top,
and quantified. The rest of the label is cheap NMF hydration and a competent
preservative system, with a delivery question hanging over the whole thing that
the ingredient list raises but cannot answer. If you want an affordable, widely
stocked copper peptide serum and you understand that a large share of the formula
is inexpensive humectant bulk, it is a defensible buy.

What would you change if you were reading this label as a formulator?
Probably fewer commodity NMF placeholders and a harder look at delivery. That is
the thinking behind the copper peptide serum we make —
Evil Goods’ Copper Peptide Blue Honey Serum (our product),
built around copper peptides, hyaluronic acid, Manuka honey and niacinamide. In
fairness we owe you the same scrutiny we just applied: The Ordinary discloses its
1%, and Evil Goods does not publish a copper concentration for ours, so on that
one measure of transparency they are ahead of us. If you are weighing a serum
against a cream for copper peptides, we walk through the trade-off in
serum versus cream.
Ingredient Desk is published by the team behind Evil Goods, so read our
comparisons knowing that.

FAQ

Where is the copper peptide in The Ordinary Multi-Peptide + Copper
Peptides 1%?
Fourth on the label, with 1% disclosed — near the top, and quantified.
That is unusually transparent for the category.

Why are there so many amino acids and sugars in it?
Positions fifteen through twenty-nine are eleven amino acids and four sugars,
all Natural Moisturizing Factor components. They provide real surface hydration
and are among the cheapest ingredients available, which is how a formula ends up
with a long run of them.

Will the copper peptide actually absorb?
GHK-Cu is small but charged, and research summaries citing Li et al. describe
near-zero permeation through intact skin without help. The formula’s one
penetration enhancer, Dimethyl Isosorbide, sits at position forty-four, which
suggests a low level. The ingredient list raises the question but cannot answer
it.

Could this serum irritate my skin?
A minority of people get mild transient irritation from copper peptides, and
copper contact allergy is uncommon but real, so patch-test if your skin is
metal-sensitive. The stack of five preservatives is also a plausible
source of reactions.

Is The Ordinary being honest with this label?
On the hero ingredient, yes — disclosed position and concentration. The
open questions are the share of cheap NMF bulk and the delivery of the active,
neither of which the brand hides; they are simply readable off the label.