GHK-Cu, often searched as the GHK peptide or GHK copper, is one of the most searched ingredients in skincare right now. This guide covers it as a topical ingredient: what it is, how to find it, and how to use a GHK-Cu serum well.
What is GHK-Cu?
GHK-Cu is a small peptide made of three amino acids, glycine (G), histidine (H) and lysine (K), bound to a copper ion (Cu). It occurs naturally in the body and was first identified in human plasma in the 1970s. Studies report that the body’s own levels of GHK decline with age, which is part of why it attracted interest as a skincare ingredient.
In skincare, GHK-Cu is used in serums, creams and masks designed around the look of firmer, smoother, more resilient skin.
How to spot GHK-Cu on an ingredient list
You will rarely see “GHK-Cu” on the official ingredient list. Look for:
- Copper Tripeptide-1 (the standard ingredient name)
- Tripeptide-1 Copper (another common way it is written)
A blue tint in the formula is another clue. Most brands do not disclose the exact percentage, so position on the list and the brand’s own description are the best guides to how much is in there.
Why GHK-Cu is popular in skincare
- It has a long research history. GHK-Cu has been studied for decades, more than many newer peptides.
- It is gentle for most people. It is often chosen by people who find stronger actives drying.
- It plays well with others. It pairs easily with hydrators like hyaluronic acid and with other peptides.
As with any ingredient, much of the published research is small-scale, and results depend on the whole formula and on consistent use. Plan on 8 to 12 weeks before judging a GHK-Cu serum.
How GHK-Cu compares to other peptides
Skincare peptides are usually grouped by what they are designed to do:
| Group | Example (label name) | Often used for |
|---|---|---|
| Carrier peptides | Copper Tripeptide-1 (GHK-Cu) | Firmer, smoother-looking skin |
| Neurotransmitter-affecting peptides | Acetyl Octapeptide-3 (SNAP-8), Acetyl Hexapeptide-8 (Argireline) | The look of expression lines |
| Signal peptides | Palmitoyl Pentapeptide-4, Palmitoyl Tripeptide-5 | The look of firmness and smoothness |
Multi-peptide serums combine groups. Our Advanced Multi-Peptide Serum, for example, pairs GHK-Cu with SNAP-8 and three supporting peptides. More in peptides in skincare.
How to use topical GHK-Cu
- Apply after cleansing, before moisturizer, morning and/or evening as directed.
- Finish with sunscreen in the morning.
- Use vitamin C at a different time of day (vitamin C in the morning, GHK-Cu at night).
- Use strong exfoliating acids on different evenings.
New to copper peptides? Start with once a day and build up. Patch test if your skin is sensitive, stop if you notice irritation, and check with your doctor if you are pregnant or breastfeeding.
Quick answers
What is GHK-Cu used for in skincare?
GHK-Cu (Copper Tripeptide-1) is used in serums, creams and masks designed around the look of firmer, smoother, more resilient skin.
Is GHK-Cu the same as copper peptides?
GHK-Cu is the best-known copper peptide, so the terms are often used interchangeably in skincare.
What is GHK-Cu called on an ingredient list?
Copper Tripeptide-1, or sometimes Tripeptide-1 Copper.
Why is my GHK-Cu serum blue?
The copper in GHK-Cu gives formulas a natural blue tint.
Can I use GHK-Cu with retinol?
Usually, yes. If your skin is sensitive, use them on alternate evenings at first. Peptides vs. retinol