Peptide glossary, the words on a certificate explained

A peptide certificate can look technical even when it is only one page. This glossary explains common terms used on analytical reports so researchers can read the document more carefully. It does not turn a report into medical evidence. It also does not show that a research compound is approved or suitable for use in people.

When checking an Egypt Labs vial, start with the batch number printed on the label. Match it to the batch reference on the report. The certificates page contains available documents for exact batches.

Identity and traceability terms

1. Batch number

A code used to identify a particular production batch. The number on the vial should match the number on its certificate.

2. Sample name

The name given to the material submitted for testing. Check that it corresponds with the peptide listed on the vial.

3. Lot

Another term often used for a defined production group. A lot number may serve the same traceability role as a batch number.

4. Test date

The date the analysis was performed or reported. It is not automatically the manufacturing date or an expiry date.

Method and instrument terms

5. HPLC

High-performance liquid chromatography. It separates components in a sample and is often used to estimate peptide purity.

6. LC-MS

Liquid chromatography combined with mass spectrometry. It separates compounds and measures mass-related signals that can support identification.

7. Mass spectrum

A plot showing detected ions by mass-to-charge ratio. Analysts compare expected and observed signals when assessing identity.

8. Chromatogram

A plot of detector response over time. Peaks represent components detected as they pass through the analytical system.

Result terms

9. Purity

The reported proportion of detected material attributed to the target component under the stated method. It does not mean the vial is sterile.

10. Assay

A measurement intended to estimate the amount or concentration of a target substance using a stated analytical procedure.

11. Retention time

The time a component takes to travel through a chromatography system. It can help comparison with a reference under the same conditions.

12. Main peak

The largest relevant signal on a chromatogram. Its area may be used in a purity calculation, depending on the method.

Limits and quality terms

13. Impurity

A detected component other than the intended main compound. The report may show separate impurity peaks or a combined value.

14. Specification

A defined acceptance criterion for a test. A result may be marked as passing when it falls within the stated specification.

15. Certificate of analysis

A document summarising tests and results for a sample or batch. It should be read with its method, limits and batch reference.

Terms such as sterile, endotoxin tested or microbiological testing should only be used when the report states that those tests were performed. Do not assume them from a purity result. If a field is unclear, ask for an explanation before ordering.

Reports may use different layouts, units and abbreviations. Always read the notes and legend rather than comparing two numbers in isolation. A result from one method may not be directly comparable with a result produced under different conditions. Keep the complete document, not only a cropped image of the headline result.

• Match the vial batch number to the report.
• Check what method was used and what it actually measures.
• Do not treat a certificate as clinical approval.

Examples of product-specific proof checks appear on the retatrutide page, BPC-157 page and GHK-Cu page.