Before a lab places an order to buy GHK-Cu in Canada in quantity, it helps to know that one product name covers at least two substantially different materials. Which one arrives changes what the label weight represents, what the purity percentage measures and what the certificate ought to show. This page explains what sits in the vial, how QC can confirm it matches the label, and how Bulk Peptides supplies GHK-Cu in bulk to Canadian labs.
Tripeptide versus copper complex
GHK on its own is glycyl-L-histidyl-L-lysine — a tripeptide of just three residues. GHK-Cu is that tripeptide with a copper(II) ion bound to it. The two have separate registry numbers and separate masses, and each gets sold as “GHK-Cu” by someone.
The copper is neither contamination nor a filler. The peptide holds it at defined coordination sites, and that complex is what most purchasers intend to order. For the numbers, see how the two registry numbers and masses relate to the complex; for where the metal binds and why its geometry matters at the bench, see our note on GHK-Cu coordination chemistry.
Confirming which form was shipped
Settle this before anything else. The report usually answers it once you know where to look. Ranked from most to least dependable:
- Measured mass. Free tripeptide and copper complex sit tens of daltons apart. If the spectrum reports the free-peptide mass, the material is free peptide, regardless of the label.
- Registry number. There are two. The one printed on the report shows which substance was analysed.
- Colour. The copper complex is blue; free GHK is not.
A vendor unable to say which form is in the vial has answered a broader question about how well they know their own stock.
Colour as a free receiving check
For staff unpacking a multi-vial delivery, the blue of copper(II) is useful information rather than decoration. Whether it is there, and how intense it is, indicates whether the metal is bound as it should be, and a shift in colour over time means the material itself has changed. Solid that looks clearly paler than expected on arrival, or a solution whose shade drifts as it stands, is flagging a problem before any instrument is involved. Nothing is cheaper to check, and no equipment is needed — it is worth writing into the receiving log for every lot.
What a 50 mg or 100 mg vial contains
The stated weight is total solid, not peptide alone, and with a copper complex the difference is bigger than most buyers assume. It takes in the bound copper, the counter-ion and residual moisture, none of which is peptide. That matters when procurement works out cost per mg across a large order.
Two adjustments are needed. The counter-ion belongs to the isolated salt and adds weight — comparing TFA and acetate salt forms explains what differs. Moisture in a lyophilised solid often reaches a few percent and is measured by Karl Fischer titration, not assumed; measuring water in freeze-dried peptides describes the method. Net peptide content accounts for all of this, yet it is the value a report most often leaves out. Our net peptide content guide shows the calculation.
Reading purity on a metal complex
HPLC purity expresses the main peak as a percentage of the total area the detector saw. On a copper complex, two caveats attach to that figure.
Wavelength is the first, and on any peptide report it is the most valuable thing to confirm. At 214 or 220 nm the detector responds to the peptide bond, so every peptidic species is picked up. At 280 nm it responds only to tryptophan, tyrosine and, faintly, phenylalanine — and GHK has none of the three. A high purity reading taken at 280 nm on this sequence carries no real meaning. Look for the wavelength on the chromatogram.
Dissociation is the second. Depending on the mobile phase, some of the complex can come apart on the column, so the trace might show complex, free peptide or a mix, and the ratio reflects the method as much as the sample. Two labs can therefore report different numbers for one vial and both be correct. How certificates of analysis come to differ lists the common reasons, and our HPLC trace reading guide explains what a shoulder next to the main peak points to.
Buy GHK-Cu in Canada at volume
Discounts are mix-and-match across the cart: any 2–3 vials take 5% off, 4–6 take 15%, 7–9 take 25%, and 10 or more take 35%. Orders past a few cases can be priced by custom quote — details on the bulk pricing page. Payment is accepted by e-Transfer, USDT or selected crypto.
We ship from inside Canada to Canadian addresses only, so there is no border crossing and no customs, duty or brokerage. Pick the carrier during checkout — Canada Post, FedEx, Purolator or UPS — and choose regular or express service. We dispatch within one business day; most parcels arrive in two to five days, varying by destination and service, and shipping is free over $200 CAD.
Our products are third-party tested by HPLC and purity analysis, and certificates are published for some products on the COA page, exactly as the lab issued them rather than as a single summary number. No certificate is packed with the order; each vial is linked to its report by the cap and crimp colour pictured in that report. For why it matters who chose and sent in the sample, read how in-house and third-party testing differ.
Storing a GHK-Cu lot
Freeze-dried peptide draws water from the air: open a cold vial and leave it uncapped and it gains moisture, which adds weight that is not peptide. Let vials warm to room temperature before opening, reseal them without delay and keep them out of the light. How light, oxygen and heat degrade peptides covers the relevant routes, and weighing hygroscopic peptide explains why the balance creeps upward mid-reading.
A copper complex also brings buffer incompatibilities that a free peptide lacks. Strong chelating agents will compete for the copper, and several routine buffer systems will not keep the complex intact. Selecting a solvent for research peptides deals with the general question; the coordination article above addresses this compound in particular.
Limits of an identity and purity report
A standard report says nothing about sterility or endotoxin, and nothing about whether material is fit for use in people or animals. Those need separate assays outside routine peptide characterisation, so their absence is not a gap in the paperwork — the tests simply were not performed. Treating a purity number as a safety claim is the most frequent misreading of these documents. The fuller discussion is in what research grade does not cover.
GHK-Cu vial sizes and blends
Both sizes contain the same material with the same documentation:
- GHK-Cu 50 mg — the practical option during method development, when a vial will be opened again and again; fewer entries per vial mean less moisture absorbed overall.
- GHK-Cu 100 mg — lower cost per milligram once your working quantity is known.
We also carry two blends that include GHK-Cu: GLOW 70 mg and KLOW 80 mg. Multi-component vials need their own scrutiny, since one purity percentage on a blend describes something other than it does on a single compound — composition and purity in blend vials sets out what to request.
Every product is sold strictly for laboratory research. It is not a medicine or a supplement, and it must not be used in humans or animals.
