Ingredients
What Is GHK? A Simple Guide to GHK and Copper Peptides
Learn what GHK means, how it relates to copper peptides, and why it keeps coming up in skincare ingredient discussions.
Last updated · Reviewed by the PeptideGHK editorial team
If you have been reading about copper peptides in skincare, you have probably seen the term GHK. It usually shows up next to GHK-Cu and Copper Tripeptide-1. The names look technical, but the idea behind them is simple. This guide explains what GHK means in plain English and how it connects to the copper peptide products you find on store shelves.
Short answer
A simple definition
A peptide is a short chain of amino acids, the same building blocks that make up proteins. GHK is one specific, very short peptide: just three amino acids linked together. Its name is shorthand for those three parts: glycine, histidine, and lysine (abbreviated K). Three amino acids long, so it is called a tripeptide.
On its own, this three-part sequence is simply called GHK. The version that shows up most often in skincare is the one paired with copper, which is where the next term comes in.
GHK and GHK-Cu
When GHK binds to a copper ion, it becomes GHK-Cu. The "Cu" is the chemical symbol for copper. This copper-bound form is what cosmetic chemists usually mean by "copper peptides," and it is the form you will find on an ingredient label as Copper Tripeptide-1.
So the relationship is simple: GHK is the peptide, and GHK-Cu is that same peptide carrying copper. If you want the full side-by-side, see our dedicated guide to what GHK-Cu means.
Why people search for it
People look up GHK for a few reasons. Some saw copper peptides mentioned on social media and want a clear explanation. Some keep seeing the term while reading about anti-aging serums. Others are staring at an ingredient list and want to know whether "GHK," "GHK-Cu," and "Copper Tripeptide-1" are the same thing.
In cosmetic use, copper peptides are usually discussed around the appearance of skin: texture, firmness appearance, and visible signs of aging. Our guide on copper peptides for skin covers that in more detail, and it sticks to appearance-focused language rather than promises of specific results.
Where it appears in skincare
You will most often find copper peptides in leave-on products like serums, and sometimes in creams. On the label, look for Copper Tripeptide-1, the standard cosmetic name for GHK-Cu. Some brands also print "GHK-Cu" in their marketing copy to make the ingredient easier to spot.
Copper peptides are usually applied after cleansing and before heavier moisturizers. If you are wondering how to fit one into your day, our copper peptide serum routine guide walks through the layering order.
Common name confusion
The biggest source of confusion is that one ingredient has several names. Here is how they line up:
- GHK: the peptide itself (glycine, histidine, lysine).
- GHK-Cu: GHK bound to copper, the form used in most products.
- Copper Tripeptide-1: the INCI (ingredient-label) name for GHK-Cu.
- Copper peptides: a general, everyday term that usually refers to GHK-Cu.
For everyday purposes, you can treat these as the same family of ingredients. If you want to see how copper peptides stack up against other actives, our copper peptides vs retinol comparison is a good next step.
Frequently asked questions
Is GHK the same as GHK-Cu?
Not exactly. GHK is a small peptide made of three amino acids. GHK-Cu is that same peptide bound to a copper ion. On skincare labels the copper-bound form usually appears as Copper Tripeptide-1. People often use the terms loosely, but the version used in most copper peptide products is GHK-Cu.
What does GHK stand for?
GHK refers to its three amino acids: glycine (G), histidine (H), and lysine (K). That is where the three-letter shorthand comes from.
Is GHK found naturally in the body?
GHK is a naturally occurring peptide sequence. In skincare, the ingredient is produced for cosmetic formulas and typically included as the copper-bound form, GHK-Cu.
Do I need to understand the chemistry to use a product?
No. The practical takeaway is that "GHK," "GHK-Cu," and "Copper Tripeptide-1" all point to the same family of copper peptide ingredients you will see on serum and cream labels.