GHK-Cu gets talked about like a new discovery. The peptide at its core was first reported in human blood in 1973. Most people figure 50 years of research means 50 years of proof in people. It doesn't.
What is GHK-Cu? A tiny copper peptide, studied mostly in cells and animals
GHK-Cu is a tiny peptide holding one copper ion. A peptide is a short chain of amino acids, the building blocks of protein, and GHK has just three: glycine, histidine and lysine. (Lysine goes by K in chemistry shorthand. Don't ask.) Cu is the symbol for copper. You'll also see it listed as copper tripeptide-1 or prezatide copper. Same molecule.
GHK-Cu at a glance
| Fact | Detail |
|---|---|
| Sequence | Gly-His-Lys (glycine, histidine, lysine) |
| What "Cu" means | Copper. GHK-Cu is GHK holding a copper ion. |
| Copper ratio | 1:1, one GHK per copper ion |
| Color | Blue, from the copper (here's why) |
| GHK alone | C14H24N6O4, about 340 daltons, CAS 49557-75-7 |
| GHK-Cu complex | CAS 89030-95-5 |
| FDA status, Oct 2026 | Not an approved drug. Under FDA review for pharmacy compounding. |
The proof: follow it from the dish to people
Let's get into it.
It started with liver cells in a lab. In 1973, Loren Pickart reported a small three-amino-acid molecule in human serum, the clear liquid part of blood, in a paper about liver cells (Pickart and Thaler, Nature New Biology 1973). By 1980 his team had shown it readily grabs copper and helps carry it into liver tumor cells grown in a dish (Pickart et al., Nature 1980).
Then animals. In 1993, a team in Reims, France, studied it in rats. They placed small mesh chambers under the skin and measured the collagen and other tissue building blocks that collected inside (Maquart et al., J Clin Invest 1993). That's a rat model. It tells you what happened in rats.
The two controlled human trials we found came back flat on their blinded checks. In 1992, a University of Texas trial in 86 patients with chronic leg ulcers tested a copper tripeptide product against a placebo, a look-alike with nothing active in it. The copper product did no better (Bishop et al., J Vasc Surg 1992). In 2006, a 13-patient trial after laser skin resurfacing had blinded evaluators and computer analysis check redness. They found no difference in redness between groups (Miller et al., Arch Facial Plast Surg 2006).
GHK-Cu and the FDA in 2026
Short version: it moved, but nothing got approved.
It has never been approved as a drug. The FDA's drug approvals database has no listing for it under any of its names.
The FDA lists GHK-Cu twice. They're two separate entries, and the two were handled differently. The FDA keeps a "Category 2" list of compounding ingredients that raise significant safety concerns. One GHK-Cu entry was on it until April 2026, when the nominations behind it were withdrawn and the FDA moved it to "nominated but withdrawn" (FDA). The FDA's own note there still says there are "limited data in humans."
The other entry is "under evaluation." As of the FDA's May 14, 2026 update, it sits in Category 1, the list of ingredients still being evaluated (FDA, 503A categories). It briefly came off that list in April too, then went back on in May.
Leaving a list isn't approval. Nothing has been decided. An FDA advisory committee is set to discuss GHK-Cu, and the FDA says that meeting will happen before the end of February 2027. No date is set yet (FDA). Advisory committees only make recommendations. The full timeline is in the FDA peptide ban of 2026, explained.
How a GHK-Cu lot gets checked
The blue tells you copper is there. It can't tell you much else. That's the certificate's job, and a solid one answers four questions.
Is it really GHK-Cu? LC-MS, short for liquid chromatography with mass spectrometry, confirms identity by weighing the molecule. Think of it as a fingerprint by mass.
How much of it is intact? HPLC purity shows what share of the peptide is the whole molecule, not broken pieces or leftovers from making it.
How much of the powder is peptide at all? Net peptide content. Freeze-dried powder also holds salts and a little water, so this number is usually lower than purity, and that's normal.
Is it clean of bacterial residue? An endotoxin test, run by the LAL method, checks for bits of bacteria left behind.
Those are the four we run on every lot of ours. How to read a peptide certificate of analysis walks through each line.
The big learning lesson
Keep reading: Why is GHK-Cu blue? · The FDA peptide ban of 2026, explained · How to read a peptide certificate of analysis
Frequently asked questions
What does GHK-Cu stand for?
G, H and K are the one-letter codes for glycine, histidine and lysine, the peptide's three amino acids. Cu is the chemical symbol for copper.
Is GHK-Cu a peptide?
Yes. GHK is a tripeptide, a chain of three amino acids, and GHK-Cu is that same peptide holding one copper ion.
What's the difference between GHK and GHK-Cu?
GHK is the bare peptide. GHK-Cu is GHK bound to copper, one copper ion per peptide, and the two have different CAS numbers (49557-75-7 and 89030-95-5).
Does GHK-Cu need to be refrigerated?
A sealed, freeze-dried vial lives in the fridge. That's our standing rule for every sealed vial, with the freezer kept for long-term storage.
Is GHK-Cu FDA approved?
No. It has never been approved as a drug. As of October 2026 it's under FDA review for pharmacy compounding, and an advisory committee is due to discuss it before the end of February 2027.
Is GHK-Cu on the WADA prohibited list?
It isn't named on WADA's 2026 Prohibited List. But the list's S0 class covers unlisted substances with "no current approval by any governmental regulatory health authority for human therapeutic use," so not being named doesn't settle it. WADA tells athletes to check any substance they can't find with their anti-doping organization.
Why is GHK-Cu blue?
The copper it holds makes it blue. Here's what the color can and can't tell you.