PubChem's selected GHK-Cu reference is CID 71587328, Prezatide copper: its dedicated CAS field lists 89030-95-5, its formula is C14H23CuN6O4+, and its printed molecular weight is 402.92 g/mol. Free GHK has a separate record, CID 73587, without copper in its formula. The GHK-Cu product page provides the product-document context; selecting a registry reference here assigns no chemical form to a Glow material.
This reference follows the identifiers through copper ratios, acetate entries, sequence notation and one certificate's codes. The GHK-Cu overview is the introductory guide, and the GHK-Cu names article covers the naming history.
Which registry record does this page use for GHK-Cu?
The starting record is PubChem CID 71587328, titled Prezatide copper, the entry for the 1:1 GHK-to-copper complex. A CID is PubChem's compound identifier, a number locating a particular database entry. Here that entry combines the name with the CAS field 89030-95-5, formula C14H23CuN6O4+ and printed molecular weight 402.92 g/mol. Free glycyl-L-histidyl-L-lysine is CID 73587, and Bisprezatide copper is CID 9831891, so neither can silently replace the selected entry. The common GHK-Cu wording is insufficient to choose between them.
For the 1:1 copper reference, PubChem CID 71587328 lists Prezatide copper, CAS 89030-95-5, C14H23CuN6O4+ and 402.92 g/mol. PubChem places free GHK and Bisprezatide copper in other entries. The identifier mapping selects a chemical database representation for discussion; it supplies no assignment of that representation to a Glow lot or to a certificate's observed species.
Teaching example: a document heading says GHK copper peptide, but its reference line gives only 402.92 g/mol. A reader can flag CID 71587328 as a candidate because PubChem prints that value there. The entry remains a candidate until the document specifies its intended record. A matching number alone leaves the formula, charge notation and reference selection unrecorded. The useful follow-up is a request for the complete reference line, including the CID, rather than an inference about the document's material.
Which CID and CAS field belongs to each form?
Each row below belongs to a named PubChem entry, and each molecular weight retains the source's displayed decimals. The dedicated CAS column reports the CAS field, not every number elsewhere in the entry. For free GHK, PubChem CID 73587 prints 49557-75-7; for Prezatide copper, CID 71587328 prints 89030-95-5; for Bisprezatide copper, CID 9831891 prints 130120-56-8. The acetate and alternative copper entries shown have no number listed in that field. Their absence is a statement about the recorded field, not proof that no registration exists anywhere. The formula column provides an independent way to see why these rows cannot be merged: copper, hydrogen counts and peptide-to-copper ratios vary. Source names and CIDs remain attached to every row so that the table can be read separately from this explanation.
| Record name | PubChem CID | Dedicated CAS field | Formula | Printed molecular weight | Representation | Source |
|---|---|---|---|---|---|---|
| glycyl-L-histidyl-L-lysine | 73587 | 49557-75-7 | C14H24N6O4 | 340.38 g/mol | Free GHK tripeptide, no copper | PubChem CID 73587 |
| Prezatide copper | 71587328 | 89030-95-5 | C14H23CuN6O4+ | 402.92 g/mol | One GHK per copper | PubChem CID 71587328 |
| Bisprezatide copper | 9831891 | 130120-56-8 | C28H46CuN12O8 | 742.3 g/mol | Two GHK per copper | PubChem CID 9831891 |
| Copper tripeptide | 139035031 | None listed | C14H21CuN6O4- | 400.90 g/mol | Alternative copper representation with a negative charge sign | PubChem CID 139035031 |
| copper;acetic acid;(2S)-6-amino-2-[[(2S)-2-(2-azanidylacetyl)azanidyl-3-(1H-imidazol-4-yl)propanoyl]amino]hexanoate | 145710244 | None listed | C16H25CuN6O6- | 460.95 g/mol | Acetate entry with a negative charge sign | PubChem CID 145710244 |
Why do formula and molecular weight differ?
The printed GHK-Cu molecular weight changes when the selected entry describes a different entity. PubChem distinguishes one peptide per copper in CID 71587328 from two peptides per copper in CID 9831891. Its alternative copper and acetate entries also differ in hydrogen counts and terminal charge signs. Protonation names the inclusion or removal of hydrogen ions in a chemical representation; the recorded hydrogen count and charge must therefore accompany the formula. An acetate-containing entry includes additional components rather than merely a longer spelling of the copper entry's title. Counterion information, where specified, is another part of that description. Display precision is a separate issue: 742.3 has one decimal place, while 402.92 has two. Copy both as printed.
GHK-Cu names appear beside multiple PubChem representations. Check the peptide-to-copper ratio, included acetate component, hydrogen count and charge sign before comparing molecular weights. PubChem CID 71587328 prints 402.92 g/mol, while the bis complex, CID 9831891, prints 742.3 g/mol. Each value describes its own entry, and each should retain its printed precision in a comparison.
Teaching example: arithmetic on printed PubChem values CID 71587328, Prezatide copper 402.92 g/mol CID 73587, free GHK -340.38 g/mol Printed-value difference = 62.54 g/mol
The subtraction does not isolate copper: the two formulas also differ in hydrogen count. The example helps identify which fields need checking, but it cannot establish a material's composition, calculate a certificate result, or decide whether two differently specified records are interchangeable. For another formula and molecular-weight reference, see the methylene blue properties reference.
How does a CAS field differ from a synonym?
A CAS-shaped string can appear in several parts of a PubChem entry, and its location determines what this reference reports. The dedicated CAS field identifies the number listed for that record. Related CAS text names a separately described relationship. A depositor-supplied synonym is text associated with the entry by a contributing source, and it does not acquire dedicated-field status merely because it looks like a registry number. Removed synonym text, if encountered, belongs in that category rather than in a current assignment column. This distinction is visible in the cited GHK records: PubChem CID 73587 has a dedicated free-peptide CAS entry and separate related numbers, while 300801-03-0 occurs among synonyms for two copper entries. Keeping these categories separate prevents a reader from transferring a number between free GHK, a bis complex and an acetate entry.
| Record | Printed identifier text | Location or status | How to log it |
|---|---|---|---|
| PubChem CID 73587 | 49557-75-7 | Dedicated CAS field | Free GHK record's listed CAS |
| PubChem CID 73587 | 130120-57-9 (copper acetate salt/solvate) | Related CAS | Related entry text, including its descriptor |
| PubChem CID 73587 | 72957-37-0 (monoacetate) | Related CAS | Related entry text, including its descriptor |
| PubChem CID 9831891 | 300801-03-0 | Selected synonym | Synonym text; dedicated CAS remains 130120-56-8 |
| PubChem CID 145710244 | 300801-03-0 | Selected synonym | Synonym text; dedicated CAS field has none listed |
PubChem CID 73587 even carries copper-associated names among its selected synonyms, although its recorded formula C14H24N6O4 contains no Cu. That example makes the reading problem concrete: a name match can retrieve an entry whose formula differs from the intended reference. Write the field heading beside the copied string, then compare the entry's title and formula before assigning a role to that string.
How are GHK and its termini written?
GHK records the residue order glycine, histidine and lysine. A residue is the amino-acid unit named within a peptide sequence. The IUPAC-IUB amino-acid symbol table maps G to Gly, H to His and K to Lys; PubChem CID 73587 supplies the free-peptide line notations GHK and H-Gly-His-Lys-OH. The latter spells out the three residues and marks the ends, called termini, with a leading H- and trailing -OH. The H inside GHK is histidine's one-letter symbol, whereas the leading H- in the expanded notation is a terminal marker. Reading them in context avoids counting an extra residue. Neither spelling adds copper to the sequence. The L descriptors in glycyl-L-histidyl-L-lysine remain part of the record's name and should not be dropped when that name is transcribed into a reference transcription.
GHK is the one-letter sequence for Gly-His-Lys. PubChem CID 73587 also prints H-Gly-His-Lys-OH, which makes the termini visible, and IUPAC-IUB supplies the G/Gly, H/His and K/Lys code mappings. Copper is not a fourth amino-acid residue. A sequence citation identifies the peptide portion but leaves the choice of copper-containing registry entry to separate formula and identifier fields.
| Notation | How to read it | What to record separately | Source |
|---|---|---|---|
| GHK | Gly, His, Lys in that order | Terminal notation and copper-entry selection | PubChem CID 73587; IUPAC-IUB symbols |
| H-Gly-His-Lys-OH | Expanded sequence with terminal markers | Any metal-containing formula and CID | PubChem CID 73587; IUPAC-IUB peptide symbolism |
| H-GHK-OH | One-letter residues between terminal markers | The named complex, if a document specifies one | PubChem CID 73587 |
| glycyl-L-histidyl-L-lysine | Free-peptide record name retaining L descriptors | CAS field and formula for the cited record | PubChem CID 73587 |
Teaching example: copying H-Gly-His-Lys-OH into a sequence cell and 71587328 into a complex-reference cell preserves two different kinds of information. Collapsing them into a single label loses the distinction between the peptide notation and the selected copper representation.
Where does copper appear in the structure record?
Copper appears in the complex record's name, molecular formula and component references, rather than as another amino-acid letter in GHK. PubChem CID 71587328 names Prezatide copper and writes Cu in C14H23CuN6O4+. Its component list names CID 73587, glycyl-L-histidyl-L-lysine, and CID 23978, Copper; its parent reference names CID 73587. PubChem CID 9831891 lists those same component identities but describes Bisprezatide copper, with two peptide units per copper. A component list therefore names the ingredients of the database representation without, by itself, counting their ratio. For a GHK-Cu structure comparison, read the record title and formula alongside the component list. They provide no depiction or assignment of a structure observed in the named lot's certificate, whose analytical values are not reproduced here.
Teaching schematic: three descriptions in PubChem CID 71587328
Record title: Prezatide copper
Formula: C14H23CuN6O4+
Component names: CID 73587, glycyl-L-histidyl-L-lysine
CID 23978, Copper
Parent reference: CID 73587
Peptide notation: GHK, taken from the free-peptide entryThe acetate entry, PubChem CID 145710244, names acetic acid in its record title alongside copper and the peptide. That addition belongs in the included-components description. It does not authorize inserting acetate into every reference labelled GHK-Cu. Likewise, a list that names both GHK and copper cannot settle the 1:1 versus 2:1 question without the record's ratio description.
Which mass does a GHK-Cu identity check compare against?
A GHK-Cu identity comparison needs the expected species, its registry reference and the mass convention being compared. Free GHK, a specified copper complex and an adduct are separate possible descriptions, not interchangeable labels. PubChem's molecular-weight field cannot substitute for an unspecified mass property. General NIST adduct terminology identifies a question to resolve; it provides no species assignment or measured value for this certificate.
The HPLC and mass spectrometry guide covers the methods explanation; this page confines the comparison to reference identifiers. For the laboratory methods comparison, see the peptide testing labs comparison.
Which fields and codes appear for the GHK-CU lot?
The linked GHK-CU lot record has a vial identifier of 260203QLGH50 and a certificate lot printed as 260203QL-GH50-01. Its certificate has two accession and Search Code pairs: page 1 pairs 2602060230 with Glow2602060230, and page 2 pairs 2602060231 with Glow2602060231. These are document identifiers, not chemical registry numbers. Both pages of the certificate print a received date of 02/06/2026 and a reported date of 2/10/2026. The analytical values are on the linked certificate itself. The GHK-Cu product page and this specific lot record provide the document context. No registry form is assigned to that lot by the comparison on this page.
| Document location | Printed metadata or labels | What is recorded here |
|---|---|---|
| Lot record | GHK-CU; vial lot 260203QLGH50 | Product name and vial identifier only |
| Certificate lot | 260203QL-GH50-01 | Printed identifier including trailing run suffix |
| Page 1 laboratory pair | Accession Number 2602060230; Search Code Glow2602060230 | Paired document identifiers |
| Dates (both pages) | Received 02/06/2026; reported 2/10/2026 | Printed dates |
| Page 1 field labels | Product; Lot; Net Peptide Content; Purity; Identity; Appearance; Mass Identification | Labels only; values on the certificate |
| Page 1 method statement | All Chemical Analysis was performed by HPLC with UV Detection Coupled with Mass Spectrometry | Printed method wording, with no analytical conclusion |
| Page 2 laboratory pair | Accession Number 2602060231; Search Code Glow2602060231 | A second report's paired identifiers for the same printed lot |
| Page 2 panel labels | Endotoxin replicates 1 and 2; USP <85> statement | Labels only; values on the certificate |
Printed-string comparison for the GHK-CU lot record Vial identifier: 260203QLGH50 Certificate identifier: 260203QL-GH50-01 Certificate without hyphens: 260203QLGH5001 Shared letters and digits: 260203QLGH50 Remaining run suffix: 01
The lookup page is cited for its accession and Search Code field names. The laboratory lookup guide covers the lookup steps. The certificate interpretation guide covers questions about a report's analytical scope, and Quality provides the site's document-availability context. The lot traceability guide covers the broader relationships among lot, sample, accession and report identifiers. Accession 2602060230 and Search Code Glow2602060230 identify a laboratory report; neither stands in for CID 71587328 or CAS 89030-95-5.
GHK-Cu is a research reference material. Check lot-specific document availability and the reported methods and findings.
View GHK-Cu on the store →Frequently asked questions
Which CAS number belongs to free GHK rather than its copper complex?
PubChem CID 73587 lists 49557-75-7 in the CAS field for free glycyl-L-histidyl-L-lysine. PubChem CID 71587328 lists 89030-95-5 for Prezatide copper. When a document gives only a CAS number, record which PubChem entry and field support its interpretation. Related CAS text on the free-peptide entry must keep its separate status. In particular, finding a copper-associated name among free GHK's synonyms does not add Cu to its formula or establish a copper assignment for the document.
Why are 402.92 and 742.3 associated with different copper records?
PubChem prints 402.92 g/mol for CID 71587328, the 1:1 Prezatide copper entry, and 742.3 g/mol for CID 9831891, the 2:1 Bisprezatide copper entry. The peptide-to-copper ratios differ, so a comparison should first establish which ratio a reference names. If paperwork gives only GHK-Cu and one number, keep that number's printed decimals but ask for the CID and formula. More decimal places do not identify the intended complex, and neither printed value is a measurement of the linked lot.
Does a CAS-shaped synonym establish a dedicated CAS assignment?
No. PubChem's cited records place 300801-03-0 among synonyms for Bisprezatide copper and the charged acetate entry. The bis record separately lists 130120-56-8 in its dedicated CAS field; the acetate entry has none listed there. A useful note records the number's location, the CID and the associated descriptor instead of copying it into a generic CAS cell. If the dedicated field is absent, write none listed in that field.
Does GHK notation specify copper content or charge?
GHK specifies the Gly-His-Lys residue order using the IUPAC-IUB one-letter mappings. PubChem CID 73587 also records terminal notation, but neither the three-letter sequence nor GHK selects a copper complex. For a document that provides only the sequence, request the intended registry record, complete formula and charge notation as separate reference details. The question can remain unresolved without changing the sequence. A copper label beside GHK does not decide between the different copper CIDs or their printed hydrogen counts.
Why does one GHK-CU lot have two accession and Search Code pairs?
The certificate has two report pages for the same printed lot. Page 1 has accession 2602060230 and Search Code Glow2602060230; page 2 has accession 2602060231 and Search Code Glow2602060231. The second report names endotoxin replicate panels, while the first lists the chemical-analysis fields. Keep each pair beside its own page reference so that one report's code is not substituted for the other's. The two pairs document separate report references; their presence does not supply an analytical value or establish lot release.
Sources and scope notes
Chemical identifier comparisons use the PubChem records cited below, read October 15, 2026. Every quoted formula, CAS field and molecular-weight value retains its recorded text or printed precision. Entries without a dedicated CAS value are described as none listed, without assigning a number from synonyms.
IUPAC-IUB supports residue symbols and peptide notation. NIST's calculator concerns glycoforms and supplies general adduct context only. Arithmetic examples are explicitly labelled subtractions of printed registry values.
The GHK-CU certificate metadata is transcribed from the linked certificate. Dates are attributed to the certificate page that prints them. No analytical value is reproduced and no species is assigned to the lot.
- PubChem CID 73587: free glycyl-L-histidyl-L-lysine Formula, molecular weight, CAS and related fields, synonyms, line notation and mass-property distinctions.
- PubChem CID 71587328: Prezatide copper Selected 1:1 reference, dedicated CAS field, formula, printed molecular weight and components.
- PubChem CID 9831891: Bisprezatide copper 2:1 representation, dedicated CAS field and synonym location.
- PubChem CID 139035031: Copper tripeptide Alternative charged formula, printed molecular weight and absent dedicated CAS value.
- PubChem CID 145710244: charged acetate representation Acetate formula, printed molecular weight, charge sign and synonym text.
- IUPAC-IUB amino-acid code symbols G/Gly, H/His and K/Lys mappings.
- IUPAC-IUB peptide symbolism Sequence and terminal notation conventions.
- NIST Glyco Mass Calculator General molecular-ion adduct terminology for glycoforms, not GHK-Cu-specific data.
- Freedom Diagnostics certificate lookup Cited for its accession and Search Code field names.