Papa & Filles · Ingredient education
GHK-Cu: what the research tells us about this copper peptide
GHK-Cu is a copper complex of the peptide glycine–histidine–lysine. Its presence in skin and scalp products has a research background. Understanding that background starts with separating the molecule from the many promises attached to it online. GHK identity
What the letters tell you
G, H and K identify three amino acids in a particular order. A peptide with three amino acids is a tripeptide. Copper binding is the reason for the “Cu” in GHK-Cu.
That identity is useful when you read a label or a study. GHK-Cu, a different copper peptide, and an unspecified peptide blend are not identical research subjects. A relevant citation needs to match the ingredient being discussed.
A frequently cited study, in context
In 1988, Maquart and colleagues reported increased collagen synthesis when cultured fibroblasts were exposed to GHK-Cu. Fibroblasts are cells involved in connective tissue. The experiment examined a cellular response under laboratory conditions. It did not test a leave-on scalp concentrate on customers or measure changes in hair density. Original study
This helps explain scientific interest in GHK-Cu. It does not establish that a scalp product rebuilds collagen, repairs follicles or produces new hair. Those are additional conclusions that would need their own appropriate evidence.
Why a molecule’s reputation is only the beginning
Imagine reading that an ingredient performed well in a study. Before applying that result to a bottle, ask whether the researchers used the same formulation, the same application method and the same outcome you care about.
For our concentrate, a useful future evaluation might examine a clearly defined cosmetic outcome under the actual directions for use. That would tell customers something directly relevant to the product. A laboratory paper remains valuable for a different reason: it helps explain why a molecule deserves investigation.
The distinction also applies to delivery. A scalp cosmetic and an injectable peptide are different products used by different routes. Personal experience with one does not validate the other. Our concentrate is for external use only.
GHK-Cu and AHK-Cu in our formula
The Papa & Filles featured formula contains GHK-Cu 1% and AHK-Cu 0.5%. We name both because they are distinct ingredients. We are not claiming that combining them has a clinically proven multiplying effect.
They sit alongside caffeine, niacinamide, panthenol and sodium hyaluronate in a daily scalp-care formula. The complete ingredient list will be provided with the final product; the featured ingredient panel is not the full INCI list.
Quick answers
Does GHK-Cu mean the product has been clinically tested? No. An ingredient name is not a clinical-testing certificate. Look for evidence that clearly identifies the finished product and the outcome tested.
Can I use the percentage to predict my results? No. The listed percentage describes a formulation detail, not a promised amount of improvement. It cannot be compared directly with a concentration used in a laboratory culture.
Why include it if you are not promising regrowth? We built the concentrate around copper peptides for a scalp-care routine and are being specific about the ingredients. We want the research and the product’s limits to be equally easy to understand.
Meet the concentrate
Explore Copper Peptide Scalp Concentrate: 30 mL, $79 CAD, planned release November 1, 2026. Get launch updates; joining does not reserve stock.