About peptides.com
The source of truth for research peptides, built so laboratories can be certain of what they receive.
peptides.com maintains a public register of every lot it releases: the compound, the laboratory that assayed it, the method, the result, and the date. Every figure on this site traces back to one of those entries, and where a page and a certificate disagree, the certificate is correct.
1Scope
The register covers every lot of every compound offered by peptides.com since 04 Mar 2026. It currently holds 211 certificates across 33 compounds. Each certificate reports the eight release tests in clause 3, the laboratory that performed them with its report reference, and the release date. A compound with no certificate in the register is not offered.
2Definitions
- Lot
- A single synthesis batch, filled into vials under one lot number of the form PC-YYMM-NNN. One lot, one certificate.
- Certificate
- The release report for a lot as issued by the assaying laboratory, published in full: results, specification, method, chromatogram, laboratory reference. Published at a permanent address before the first vial of the lot ships.
- Release
- The point at which every line of the specification has been met and the certificate is public. A lot is listed only after release.
- Verification code
- Six digits printed under the lot number on every vial, and encoded in the label QR. The code resolves to the certificate for that lot and nothing else.
- Withdrawal
- The removal of a released lot from sale after a finding that it no longer meets specification. The certificate is retained, annotated with the date and the finding, and every recipient on record is notified.
- House designation
- A catalogue name used where no generic name is asserted. No CAS number or identity is claimed for such an entry; the observed mass of each lot is reported on its certificate.
3Release specification
Every lot is tested against the same eight lines. Each is reported on the certificate with its method and the laboratory's result. A lot that fails any line is destroyed and does not enter the register as released material.
| Test | Method | Specification |
|---|---|---|
| Appearance | Visual | Conforms to description |
| Purity | RP-HPLC, UV 214 nm | ≥ 99.0%, chromatogram published |
| Identity | LC-MS (ESI+) | Observed mass within tolerance of calculated mass |
| Net peptide content | Amino acid analysis | 90–110% of label claim, reported in mg |
| Water | Karl Fischer | ≤ 8.0% |
| Acetate | Ion chromatography | ≤ 15.0% |
| Heavy metals | ICP-MS, USP ⟨232⟩ | ≤ 10 ppm total |
| Endotoxin | USP ⟨85⟩ LAL | < 10 EU/mg |
Metal complexes carry a ninth line, metal content by ICP-OES. Blends report purity and identity per component.
4Release procedure
- The lot is received, quarantined and assigned its lot number.
- Samples are dispatched to one of three contract laboratories. Allocation between laboratories rotates and is not selected by peptides.com.
- The laboratory reports every line of clause 3. peptides.com performs no release assay of its own.
- If any line fails, the lot is destroyed and recorded as destroyed. 7 lots have been destroyed to date.
- If every line passes, the certificate is published at its permanent address, the verification code is printed on the labels, and the lot is listed.
5The record
Certificates are not removed. They remain published after a lot sells out or is superseded, and after a withdrawal. 1 lot has been withdrawn after release, PC-2604-018; its certificate carries the annotation. Aggregate figures for every released lot, including purity distribution and laboratory allocation, are published on the lab results page.
6Literature and models
Where peer-reviewed literature exists for a compound it is listed as a bibliography: title, journal, year and authors, without summary. Structures and three-dimensional models are drawn from the catalogued sequence with idealised geometry; they illustrate connectivity and are not evidence of identity. Identity is established only by the certificate. A citation is a reference, and a model is not a measurement.
7Conditions of supply
Material is supplied to qualified investigators, institutional laboratories and commercial research groups for laboratory research use only. No human or animal administration. No personal, clinical, veterinary, therapeutic, diagnostic, or cosmetic use. Orders indicating any other use are declined. None of the compounds in the register is approved by the U.S. Food and Drug Administration for use in humans or animals. The full conditions are the Terms & RUO Policy; the limits of what this site states are the Disclaimer.
8Revision
This page describes the procedure in force. It is revised when the procedure changes, and the catalogue revision printed in the footer of every page identifies the version. Discrepancies between any page and a certificate are resolved in favour of the certificate. Report one to lab@peptides.com.