Testing, Documentation and Quality Process

Every research product is identified by its product name, strength, and a unique Stock Keeping Unit (SKU). The SKU links the physical product to its specification sheet, batch records, and — where available — its Certificate of Analysis. This ensures that documentation can be traced to a specific product and batch.

Each production run is assigned a unique batch number by the manufacturer. This number appears on the product packaging and is linked to the corresponding documentation. When a new batch arrives, the batch number is recorded alongside the product SKU and the date of receipt.

When a Certificate of Analysis or product specification is received for a specific batch, it is matched to the product using both the product name and the batch number. This ensures that a CoA for Batch 2024-001 of Product A is never incorrectly associated with Batch 2024-002 of the same product — or with a different product entirely.

Documents are stored with metadata including the product name, SKU, batch number, document date, testing laboratory, and document source. This metadata allows documentation to be filtered and retrieved by product, batch, or document type.

Manufacturer-provided documentation includes product specification sheets, safety data sheets, and — in some cases — internal quality-control reports. These documents are supplied by the product manufacturer and describe the product's physical and chemical properties, including molecular weight, sequence information (where applicable), physical appearance, and solubility data.

Manufacturer documentation is clearly labelled as manufacturer-provided when displayed on the website so that researchers can distinguish it from independently commissioned testing.

Where independent testing has been commissioned, samples from selected product batches are sent to third-party analytical laboratories for analysis. These laboratories are not affiliated with the product manufacturer and report their findings independently.

Independent testing reports are labelled as independent laboratory report and include the name of the testing laboratory, the date of analysis, the testing method used, and the reported result.

We do not claim that every batch of every product has been independently tested. The documentation displayed on the website reflects the testing that has been completed and made available at the time of publication.

High-Performance Liquid Chromatography (HPLC) is the primary method used to assess the purity of research peptides. HPLC separates the components of a sample based on their chemical properties, producing a chromatogram — a graph showing peaks that correspond to individual compounds. The area under each peak, expressed as a percentage of the total area, indicates the relative proportion of each component.

An HPLC result of, for example, 98.5% means that the main peak — corresponding to the target peptide — represents 98.5% of the total peak area. The remaining 1.5% may represent related substances, residual solvents, or other trace components.

For a detailed explanation of how to interpret HPLC results, see our article: How to Read a Peptide Certificate of Analysis. For a broader introduction to the method, our HPLC testing explained guide covers how the technique works and what the results mean.

Mass Spectrometry (MS) is used to confirm the identity of a research peptide by measuring its molecular mass. The observed mass — typically reported as the mass-to-charge ratio (m/z) — is compared against the expected molecular weight of the target compound. A match between the observed and expected mass provides evidence that the sample contains the correct compound.

Identity testing is important because HPLC purity alone does not confirm that the sample contains the correct peptide — only that it contains a compound of a certain purity. MS analysis answers the separate question: "Is this actually the compound we think it is?"

For a deeper look at how mass spectrometry is used to confirm peptide identity, see our mass spectrometry peptide testing guide.

Before a document is published on the website, it is reviewed to confirm that:

• The product name on the document matches the product it is being associated with
• The batch number on the document is consistent with the product's current batch
• The document source is correctly identified (independent, manufacturer-provided, or internal)
• The document date is recorded and displayed
• Any superseded version of the same document is clearly marked

When a new Certificate of Analysis or product specification is issued for a batch — for example, because additional testing has been completed — the previous document is marked as superseded. Superseded documents remain accessible for reference, but the most recent document is clearly identified as the current version.

If a newer document exists for a given product and batch, the superseded entry will link to the current document. This ensures that researchers always have access to the most up-to-date information while maintaining a record of previous documentation.

Researchers can verify product documentation by:

1. Checking the batch number on the product packaging against the batch number on the Certificate of Analysis
2. Confirming that the product name and strength on the CoA match the product received
3. Reviewing the testing date to confirm the CoA is current for the batch
4. Checking the document source label to understand whether the report is independent or manufacturer-provided
5. Contacting our support team with the product name and batch number if any documentation appears inconsistent

For batch-specific documentation requests, search our Certificate of Analysis library, use our batch verification tool, or contact our support team. Our documentation page explains how specifications, COAs and batch records are organised.