Independent Peptide Testing Labs
Purity and identity vary between sources, so informed researchers verify what they have rather than take a label at face value. Independent labs run HPLC and LC-MS analysis and issue a certificate of analysis (COA) — and the strongest vendors already publish one for every batch.
What a test actually verifies
- Identity (LC-MS). Mass spectrometry confirms the molecule is the peptide it claims to be by matching its molecular weight.
- Purity (HPLC). High-performance liquid chromatography measures how much of the sample is the target peptide versus impurities, reported as a purity percentage.
- Contaminants (optional). Fuller panels add endotoxin, heavy metals, and sterility screening for a complete safety profile.
The labs researchers trust
Three independent labs are cited again and again as the gold standard for research peptide verification. Each is listed on community trust and capability — none of these are paid placements.
Janoshik Analytical
Prague, Czech Republic (EU)
The most-referenced independent lab in the research community. Tests are paid for by suppliers, but results are issued by Janoshik directly, and COAs carry a QR code for public online verification.
- Methods
- HPLC (purity), LC-MS (identity), endotoxin (LAL), heavy metals, sterility
- COA
- PDF with QR-code verification
- Good for
- Publishable community COAs and vendor lot verification
MZ Biolabs
Tucson, Arizona (USA)
A DEA Schedule III, GLP-standard facility that leans toward pharmaceutical-grade characterization. Oriented primarily toward vendors and businesses rather than individual researchers.
- Methods
- HPLC + mass spectrometry (comprehensive panels)
- COA
- PDF / verifiable report
- Good for
- Pharmaceutical-grade vendor auditing
Colmaric Analyticals
St. Petersburg, Florida (USA)
A full-service contract research organization consistently cited alongside Janoshik and MZ Biolabs. Accepts both individual researchers and vendors, with detailed analytical reports.
- Methods
- TLC, HPLC (purity), mass spectrometry (identity)
- COA
- Detailed analytical report (PDF)
- Good for
- Detailed reports for individual researchers and vendors
How to read a COA
A certificate of analysis packs a lot into one page. The parts that matter most:
- Identity / mass match. The measured molecular weight should match the peptide's known mass. A mismatch means it isn't what the label says.
- Purity percentage. The HPLC figure — higher is better. Reputable research peptides typically report high-90s purity.
- Batch / accession number. Ties the COA to a specific lot. A COA that doesn't match the lot you received tells you nothing about it.
- Verification link or QR. Where offered (e.g. Janoshik), confirm the report against the lab's own database rather than trusting a forwarded PDF.
Vendors that already publish COAs
Published per-batch COAs are a core part of how we score and rank vendors. Skip the guesswork and start with suppliers that already test and publish — each links to its current coupons and deals.
Browse all peptides →
Peptide testing FAQ
What is third-party peptide testing?
An independent lab analyzes a peptide sample to confirm what it is (identity) and how pure it is, then issues a certificate of analysis (COA). Because the lab has no stake in the product, its result is more credible than a vendor's own in-house claim.
Which peptide testing lab is most trusted?
Janoshik Analytical is the de facto community standard and publishes QR-verifiable COAs. MZ Biolabs and Colmaric Analyticals are the most-cited US-based options. Results from any of the three are widely accepted as the gold standard.
How much does peptide testing cost?
It varies by lab and panel. A comprehensive panel from a US lab commonly runs in the low hundreds of dollars per sample, with turnaround typically one to two weeks. Identity-and-purity-only panels cost less than full contaminant screens.
Can I submit my own sample for testing?
Some labs accept submissions from individual researchers (Colmaric, Janoshik), while others are set up primarily for vendors and businesses (MZ Biolabs). Check each lab's intake process before shipping a sample.
Do vendors test their own products?
The stronger vendors commission independent COAs and publish them per batch — that transparency is exactly what separates a reputable supplier from an unknown one. Published COAs are a core part of how we score and rank vendors.
Testing services listed here are independent third parties for research use only. The Peptide Catalog is not affiliated with these labs and does not perform testing. Details are summarized from public sources and may change — confirm methods, intake, and pricing directly with each lab.