ION BLUE · Peptides Done Precisely
How much GHK-Cu should actually be in a copper peptide serum?
The short answer
GHK-Cu (copper tripeptide-1) is biologically active in published laboratory studies at nanomolar concentrations — billionths of a mole per litre. In cultured human skin cells, researchers reported effects across a 0.01–100 nM range.1 Because it behaves like a signaling molecule rather than a bulk acid or exfoliant, the number that matters isn't a big headline percentage on the label — it's whether a real, disclosed amount of actual GHK-Cu is in the bottle. ION BLUE uses a disclosed 0.10% GHK-Cu, single active, with no blends or fillers.
What is GHK-Cu?
GHK is a small, naturally occurring tripeptide — glycyl-L-histidyl-L-lysine — first identified in human blood plasma in 1973.2 It has a strong affinity for copper, and the copper-bound form is written GHK-Cu (cosmetic INCI name: copper tripeptide-1). Your own body already makes it.
The catch is that we make less of it over time. Published figures put plasma GHK at roughly 200 ng/mL around age 20, declining to about 80 ng/mL by age 60.1 That age-related drop is a large part of why copper peptides became interesting to skin-science researchers in the first place.
Why "more" isn't automatically better
Here's the part the marketing rarely explains. In the published cell studies, GHK-Cu didn't need to be present in large amounts to be active. Human dermal fibroblasts showed responses — including increased production of collagen and elastin in those cell cultures — at concentrations as low as 0.01, 1 and 100 nanomolar.1 For scale, the natural plasma level itself sits around 10-7 mol/L.1
A molecule that works by signaling cells behaves differently from one that works by sheer quantity. Past the point where the receptors and pathways are engaged, piling on more active doesn't linearly "do more" — and can raise the odds of irritation. So a serum shouting a huge percentage isn't automatically a better serum. What you actually want to know is simpler: how much real GHK-Cu is in here, and can they tell me?
Why a "1%" claim on the label can be misleading
We never name other brands, and we won't here. But it's worth understanding, at a category level, how a big number can appear on a label without much actual peptide behind it. There are a few honest explanations:
1. The percentage may describe a pre-diluted raw material
Copper peptide is often supplied to formulators as a ready-made solution that is already mostly water. If a label's "1%" refers to 1% of a solution that is itself a fraction of a percent active, the real GHK-Cu content can land near a thousandth of a percent.
2. The percentage may describe a blend, not the peptide
Many serums lead with a multi-peptide "complex." A "1% complex" is not the same as 1% GHK-Cu — the copper peptide might be one of several ingredients sharing that number, present in a trace amount.
3. The percentage may simply not be disclosed at all
If a brand won't state the actual concentration of the actual active, the percentage on the front of the box tells you very little.
None of this is illegal or even unusual. It's just opaque — and opacity is exactly the thing we built ION BLUE to avoid.
So what's the right amount?
There isn't a single magic number that fits every formula — stability, pH, delivery and the rest of the formulation all matter. But the principle holds: because GHK-Cu is active at signaling-level concentrations, the honest, useful thing a brand can do is put in a real, meaningful amount of genuine GHK-Cu and tell you exactly what it is.
That's what ION BLUE does. One active. A disclosed 0.10% GHK-Cu. No proprietary blend to hide behind, no filler peptides padding a number. You can read the amount, check it against the science on this page, and decide for yourself. That's the whole idea: the truth wins.
Frequently asked questions
Is a higher percentage of GHK-Cu always better?
No. In published laboratory studies, GHK-Cu is active at nanomolar concentrations — extremely small amounts — because it works by signaling cells rather than by bulk quantity.1 Beyond the level needed to engage those pathways, more active doesn't linearly do more and can increase the chance of irritation. A real, disclosed amount matters more than a large number on the label.
What does "0.10% GHK-Cu" actually mean?
It means 0.10% of the finished ION BLUE serum, by weight, is genuine copper tripeptide-1 (GHK-Cu) — a single, disclosed active, not a multi-peptide blend and not a pre-diluted trade solution counted as if it were pure.
Why do some serums advertise "1%" or higher?
At a category level, a large percentage can refer to a pre-diluted raw material, or to a multi-ingredient "complex" in which GHK-Cu is only a trace part, or it may not be disclosed against the actual active at all. A headline number and the real GHK-Cu content are not always the same thing.
Is GHK-Cu naturally found in the body?
Yes. GHK is a naturally occurring tripeptide first identified in human plasma in 1973.2 Published figures show plasma levels declining from roughly 200 ng/mL around age 20 to about 80 ng/mL by age 60.1
What is GHK-Cu studied to support in the appearance of skin?
Published cell-culture research has examined GHK-Cu in the context of skin's structural proteins, reporting increased production of collagen and elastin in cultured human fibroblasts.1 This is ingredient-level laboratory research, not a promise about any individual product's results. ION BLUE products are cosmetics, formulated to support the appearance of skin.
Sources
- Pickart L, Margolina A. "Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data." International Journal of Molecular Sciences. 2018;19(7):1987. doi:10.3390/ijms19071987. PMID: 29986520. Read the full paper (open access).
- Pickart L, Thaler MM. "Tripeptide in human serum which prolongs survival of normal liver cells and stimulates growth in neoplastic liver." Nature New Biology. 1973;243(124):85–87. PMID: 4349963. View on PubMed.
- Pickart L, Margolina A. "Skin Regenerative and Anti-Cancer Actions of Copper Peptides." Cosmetics. 2018;5(2):29. doi:10.3390/cosmetics5020029. Read the full paper (open access).
ION BLUE products are cosmetics and are not intended to diagnose, treat, cure, or prevent any disease. Research described on this page concerns the ingredient GHK-Cu in laboratory settings and is provided for education; it is not a claim about the results of any individual product. Last reviewed July 2026.