Peptide Journal

Vol. 1 · Ingredient series
Copper peptides
Peptide JournalIngredient Monograph

GHK-Cu: the little blue molecule with a 50-year story

Copper tripeptide-1, from its 1973 discovery to the modern serum shelf

Contents

  1. Overview
  2. A short history
  3. Why the blue
  4. What it is used for
  5. How it is used well
  6. Fifty years on
  7. References

Most hero ingredients in skincare are marketing inventions. GHK-Cu is the opposite — a peptide with one of the longest research trails in cosmetic science, discovered decades before it became fashionable. This monograph covers what it is, why it is blue, and how it is used well.

1. A short history

In 1973, biochemist Dr Loren Pickart identified a small three-amino-acid peptide, glycyl-L-histidyl-L-lysine, with a remarkable affinity for binding copper.[2] The complex it forms, GHK-Cu, is found naturally in human plasma, saliva and urine. Our levels decline significantly as we age, in parallel with the changes many people describe in their forties and fifties.[3] Its structure is shown in Figure 1.

Gly glycine His histidine Lys lysine peptide bond peptide bond Cu copper (II) ion coordination bonds
Figure 1. Schematic of GHK-Cu. The tripeptide coordinates a single copper (II) ion. The natural blue colour of a genuine copper peptide solution comes from the copper itself.

2. Why the blue

That signature blue colour is the copper itself, bound within the peptide complex. It is the natural colour of a genuine copper peptide solution, no dye required. A serum that has drifted brown or green is typically a sign of oxidation — an aged and degraded bottle.

3. What it is used for in cosmetics

GHK-Cu is applied topically for the appearance of ageing skin: firmer and more lifted looking, smoother and more refined in texture, and a more even, luminous tone.[1] It is frequently chosen as the gentler path, delivering a visible-results routine without the irritation profile of retinoids or exfoliating acids.

4. How it is used well

A stated dose, so you know what you are getting, for example 1%. A fresh supply, because oxidation degrades copper peptides after opening, so small bottles used within about a month stay at strength while a large bottle ages on the shelf, as shown in Figure 2. A simple daily ritual of two to three drops on clean, slightly damp skin, morning and night. And patience to week eight, since the look of firmness builds gradually.

Fresh 10ml, replaced monthly One 30ml bottle, opened for months 0246 Months after opening Relative potency
Figure 2. Relative potency after opening. A fresh 10ml replaced monthly stays close to full strength, while a single large bottle used over months declines as it oxidises.

5. Fifty years on

Fifty years after its discovery, the little blue molecule has earned its moment. The brands worth your money are the ones treating it with the respect the science deserves: honest dosing, fresh delivery, and no shortcuts.

References

  1. Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide. International Journal of Molecular Sciences. 2018;19(7):1987.
  2. Pickart L. The human tri-peptide GHK and tissue remodeling. Journal of Biomaterials Science, Polymer Edition. 2008;19(8):969–988.
  3. Brincat M, Versi E, Moniz CF, et al. Skin collagen changes in postmenopausal women. British Journal of Obstetrics and Gynaecology. 1987.
  4. Australasian College of Dermatologists. Ageing skin: patient guidance.

This article is general information about cosmetic ingredients and the appearance of skin. It is not medical advice and does not describe the treatment of any condition. KYORS is a cosmetic skincare product intended to improve the look and feel of skin. It is not intended to diagnose, treat, cure or prevent any disease. Individual results vary.