For laboratory research use only · Not for human or veterinary use

AFA BIOSCIENCES
Cart0

Lot traceability

Every number we publish came off our own instruments

Every vial carries a lot number. Enter it and you get that lot's release panel — the same results on the signed certificate in the box, not a representative example.

Certificate of analysis

GHK-Cu

View product →

Purity by HPLC

99.80%

Lot
BUS-GHK-2549A
Released
2025-11-30
Retest by
2027-11-30
Label claim
50 mg
Measured
50.6 mg
Observed mass
403.9 Da
Theoretical
403.94 Da
Acetate
0.0%
  • AppearanceVisualConformsPass
  • PurityAnalytical HPLC · spec ≥ 98%99.8%Pass
  • IdentityESI-MSConfirmedPass
  • Net peptide contentHPLC vs. reference50.6 mgReported
  • Water contentKarl Fischer1.9%Reported
  • Heavy metalsICP-MSNot detectedPass
  • BioburdenPlate countNo growthPass
  • EndotoxinUSP <85>< 0.05 EU/mgReported

Chromatogram and mass spectrum are included in the signed PDF shipped with the order.

Request the signed PDF

Every released lot

Open any lot on record. Your order ships with the certificate for the lot actually in the box.

The release panel

Eight assays, run on every lot

A lot that fails any of them is destroyed rather than downgraded and sold on as a lower grade. That policy is the most expensive one we have and the one we are least willing to change.

  1. 01

    Appearance

    Visual

    Color, cake integrity and absence of visible particulates, checked against the specification for the sequence.

  2. 02

    Purity

    Analytical HPLC · 214 nm

    Reverse-phase C18, gradient elution. Purity is area percent of the main peak against the total integrated area — not against a hand-picked subset of peaks.

  3. 03

    Identity

    ESI mass spectrometry

    Electrospray ionization confirms the molecular ion against the theoretical mass. Both numbers go on the certificate so you can check the arithmetic yourself.

  4. 04

    Net peptide content

    HPLC vs. reference standard

    How much peptide is actually in the vial, as distinct from fill weight. We publish both, because the gap between them is real and most sellers quietly leave it out.

  5. 05

    Water content

    Karl Fischer titration

    Residual water in the lyophilized cake. It matters because water is mass you paid for and did not want, and because it drives long-term stability.

  6. 06

    Heavy metals

    ICP-MS

    Screened for the elemental impurities that carry through from reagents and hardware.

  7. 07

    Bioburden

    Plate count

    Microbial growth on the released material. A lyophilized cake is not sterile by default and should not be assumed to be.

  8. 08

    Endotoxin

    USP <85>

    Bacterial endotoxin load, reported as a figure rather than a pass mark, so you can judge it against whatever your own work requires.

On independent verification

These results are produced in our own laboratory, not by an accredited third party, and we would rather say so than imply otherwise. If a third-party assay ever disagrees with one of our certificates, send it to us: we will retain-sample the lot, re-run it, and if the lot is genuinely off specification we will refund the affected order in full, recall the remainder and reimburse your testing cost.