Lab partners & testing

Our research compounds are tested by third-party laboratories, and their Certificates of Analysis (COAs) are published on our Verification page. This page explains who our analytical partner laboratories are (Lingda Laboratory and Bio-Analysis Centre London), what they test, and how to read a COA. For a full 10-point evaluation checklist comparing UK peptide suppliers, read our Trusted Peptide Companies UK: COA Verification & Analytical Standards Guide →.

Our testing laboratories

Lingda Laboratory

• Website: https://lingdalab.com
• Location: sample intake in Gulfport, Mississippi, USA (as stated on the laboratory’s website)
• Certificates on our Verification page: most of our current certificates (46 of 48 at the time of writing)
• Report numbers: LDA22160842 to LDA22161292. Test dates 31 August to 3 September 2026.
• Tests shown on its certificates:
  • Chromatographic purity and quantity: HPLC-UV/VIS
  • Heavy metals: lead, cadmium, arsenic and mercury by ICP-MS (specification ≤10 ppm)
  • Bacterial endotoxin: LAL assay (specification ≤0.50 EU/mg)
  • Sterility: bacteria, fungi and yeast (specification: no microbial growth)
• Verify a report: each Lingda certificate has a report number and a “Proof of Authenticity” QR code. You can look up the report number at https://lingdalab.com/verify.

Bio-Analysis Centre

• Website: https://b-ac.co.uk
• Location: London BioScience Innovation Centre (LBIC), King’s Cross, London, UK
• Certificates on our Verification page: MOTS-c 10mg (“002 sample”)
• Tests shown on its certificate: HPLC purity at 215nm (98.8%) and LC-MS identity confirmation on a Shimadzu LCMS-8040, with the detected ions matched to the expected masses for MOTS-c

What the tests mean

Test	What it measures	Method shown on COA
Purity	Percentage of the main compound relative to other detected components	HPLC with UV detection
Identity	Confirms the compound’s molecular mass matches the expected value	LC-MS (mass spectrometry)
Quantity / net content	Amount of compound in the vial (e.g. 56.32mg measured for a 50mg SS-31 vial)	HPLC-UV/VIS
Heavy metals	Lead, cadmium, arsenic, mercury in parts per million	ICP-MS
Endotoxin	Bacterial endotoxin, in endotoxin units per mg	LAL assay
Sterility	Absence of bacterial, fungal and yeast growth	Culture-based sterility test

How we test, in detail → · Read an HPLC chromatogram → For more on the methods, see our article Laboratory Testing Explained: From Sample to Certificate.

How to read a Certificate of Analysis

1. Sample name and size. Check that they match the product and vial size you ordered.
2. Report number and dates. Each certificate has a unique report number, a test date and an issue date.
3. Laboratory. The name and address of the laboratory that carried out the testing.
4. Chromatogram. The HPLC trace. A single dominant peak indicates high chromatographic purity. Smaller peaks are other components.
5. Results versus specification. Each result is shown next to its acceptance limit (e.g. heavy metals ≤10 ppm).
6. Conclusion and sign-off. Whether the sample met the specifications, with the names of the analyst, reviewer and approver.

A COA relates to the specific sample that was tested. The samples tested are taken from the batches we supply.