sets
about
the name
a cofactor is the part that makes the enzyme work
In biochemistry, a cofactor is the non-protein compound an enzyme needs before it can do anything at all. Without it the enzyme is present and useless.
Copper is literally one. In GHK-Cu, the copper is what makes the tripeptide a signal rather than three amino acids in a bottle. The name is not a metaphor we reached for afterwards; it is what the hero ingredient actually is.
We started this because the category makes you choose. There are brands with real doses and no personality, and brands with personality and a formula that is mostly marketing. We could not find one that put the number on the front of the bottle and was still something you wanted on the shelf.
So: the dose is printed where you can see it. The layering warnings are on the product page, not buried in a carton insert. And the display layer — the colour, the type, the writing — is allowed to have a point of view, because none of that changes what is in the formula.
Every product prints its active and its concentration on the front panel, in the same place, in the same type. Not “contains peptides.”
No second hue, no seasonal colourways. The range is one cupric blue in five dilutions, and the step a product wears is its position in the system.
No fragrance, no essential oils, no dyes. In the copper range, no direct acids either — they would inactivate the thing you are paying for.
a note from us
We are not going to tell you this is a miracle, because it is not, and you would not believe us anyway.
What we will tell you is what is in it and how much, what it will not do, and what not to put it next to. Eight weeks of daily use is a fair test of the blue serum. Twelve weeks is a fair test of anything working on pigment. If it has not done anything by then, tell us and we will take it back.
That is the whole pitch. The rest is packaging — and we did spend a long time on the packaging.
the Cofactor team
1.0%
GHK-Cu in the flagship, printed on the front
23
products, each with its dose and its layering rule stated
60
days to decide, on anything you have opened
The shop
the range
- sets
- the copper system
- the copper system
the eye serum$128Brighter, firmer-looking eyes. The copper hero, built for the thinnest skin you own. - the copper system
- the copper system
- the shield system
- the shield system
- the shield system
- treat
the recovery ampoule$138Calms skin you pushed too far, fast. Polynucleotides, honestly described. - treat
- treat
the night retinal$108Smoother texture, softer lines, no peeling week. Retinal, one step from retinoic acid. - treat
- daily routine
- daily routine
- daily routine
- daily routine
- daily routine
- daily routine
- weekly
- weekly
- body
- body
the hand cream$48Softer, smoother hands. Peptides and ceramides for the parts that work hardest.