How to Verify a Peptide COA (UK): A Step-by-Step Check

For in-vitro laboratory research use only. Not for human or veterinary use. Corex Vitality™ supplies research compounds to adults (18+) for laboratory research. Nothing on this page is medical advice.

A Certificate of Analysis (COA) is only useful if you can confirm that it is genuine and that it matches what you are buying. This guide shows UK researchers how to check a research peptide COA in five steps, using a real Lingda Laboratory report from the Corex Vitality™ COA library as the worked example.

What a COA is, and who commissioned it

A COA is a laboratory’s record of the tests it ran on one sample and the results it found. It should name the laboratory, give a unique report or batch number, state the methods used, and show the results against any stated limits.

For the compounds sold by Corex Vitality™, testing was commissioned by the manufacturer or supplier before the stock reached us. That is why the Client field on the original certificates names that party rather than Corex Vitality™. We publish each COA exactly as the laboratory issued it, without editing, so the report can be checked against the laboratory’s own records.

Five steps to verify a peptide COA

1. Find the COA before you order. Search our COA verification page by compound name or report number. Each product page also has a View Lab COA button beside the price.
2. Match the compound, size and number. Check that the sample name and size on the COA match the product and strength you are ordering, and later the label on your vial. If the COA covers a different size, the product page says so.
3. Check the report with the laboratory. Lingda Laboratory COAs carry a Proof of Authenticity QR code and a report number in the header. Scan the QR code, or enter the report number exactly as printed at lingdalab.com/verify. Lingda states that a returned record confirms the report exists and that the values match what it issued. If a number returns nothing, the document did not come from that lab.
4. Read the results against the limits. Look at the HPLC purity and chromatogram, the measured quantity, and any extra panels. Lingda COAs report heavy metals by ICP-MS, endotoxin by LAL assay and sterility, each with a stated specification.
5. Know what the lookup does not prove. Lingda notes that a lookup does not prove the vial in your hand came from the tested batch: a report covers the sample received on that date. Keep your vial label, order details and the COA report number together for your records.

Worked example: BPC-157 10mg (Lingda Laboratory, LDA22161152)

This is how the published BPC-157 10mg COA reads, field by field. You can open it from the BPC-157 COA search.

To verify it, scan the QR code in the top-right corner of the certificate or enter LDA22161152 at lingdalab.com/verify, then compare the returned values with the table above.

What a COA does not tell you

• Purity is not identity. HPLC purity is the share of the main peak in the chromatogram. Reversed-phase HPLC can separate closely related sequences, but it does not by itself confirm the molecule’s mass. Only one Corex Vitality™ COA, MOTS-c 10mg from Bio-Analysis Centre, includes an LC-MS identity check.
• Purity is not net peptide content. A lyophilised cake also contains counter-ions and moisture. See HPLC purity vs net peptide content and TFA vs acetate counter-ions.
• One sample, one date. A COA describes the sample the lab received. It is not a statement about every vial or about storage after testing.
• Size coverage varies. Not every size has its own COA. For example, the published Semaglutide COA is for a 40mg sample, and the Tirzepatide COAs cover 10mg to 60mg.

For a walk-through of the laboratory process itself, read Laboratory testing explained: from sample to certificate and the science hub. Details of each laboratory are on our testing laboratories page.

Warning signs on any supplier’s COA

• No laboratory name, report number or verification route.
• A report number that the laboratory cannot find.
• Cropped headers, missing chromatograms or results with no method stated.
• A COA for a different compound or size presented as if it covered your vial.
• Claims about tests, such as mass spectrometry, that do not appear on the certificate.

For a wider supplier checklist, see trusted peptide companies UK. To browse compounds with their COAs, visit our buy research peptides UK hub.

Published research (in-vitro, receptor and analytical studies)

References verified against PubMed via NCBI E-utilities on 29 October 2026. They describe laboratory research only and are not claims about any product sold here.

1. D’Hondt M, Bracke N, Taevernier L, et al. Related impurities in peptide medicines. J Pharm Biomed Anal. 2014;101:2-30. PMID: 25044089. DOI: 10.1016/j.jpba.2014.06.012.
   Review of peptide-related impurities from solid-phase synthesis and degradation (e.g. deletion and insertion sequences, oxidation, deamidation, racemisation) and how chromatographic methods are used to detect them.
2. Mant CT, Hodges RS. Design of peptide standards with the same composition and minimal sequence variation to monitor performance/selectivity of reversed-phase matrices. J Chromatogr A. 2012;1230:30-40. PMID: 22326185. DOI: 10.1016/j.chroma.2012.01.053.
   Analytical chemistry study showing reversed-phase HPLC can resolve synthetic peptides that differ by a single residue substitution, which is why a single main peak is a meaningful purity measure.
3. Cornish J, Callon KE, Lin CQ, et al. Trifluoroacetate, a contaminant in purified proteins, inhibits proliferation of osteoblasts and chondrocytes. Am J Physiol. 1999;277(5):E779-83. PMID: 10567002. DOI: 10.1152/ajpendo.1999.277.5.E779.
   In-vitro cell-culture study: residual trifluoroacetate (TFA) counter-ion from HPLC purification altered cell proliferation readouts, showing why counter-ion form matters when interpreting in-vitro results.
4. Ding JL, Ho B. Endotoxin detection—from limulus amebocyte lysate to recombinant factor C. Subcell Biochem. 2010;53:187-208. PMID: 20593268. DOI: 10.1007/978-90-481-9078-2_9.
   Review of the Limulus amebocyte lysate (LAL) assay used for bacterial endotoxin testing, its serine-protease cascade, and recombinant factor C alternatives.
5. Mittal M, Kumar K, Anghore D, Rawal RK. ICP-MS: analytical method for identification and detection of elemental impurities. Curr Drug Discov Technol. 2017;14(2):106-120. PMID: 28003007. DOI: 10.2174/1570163813666161221141402.
   Review of inductively coupled plasma mass spectrometry (ICP-MS) for quantifying elemental impurities such as lead, cadmium, arsenic and mercury in quality-control testing.

Frequently asked questions

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