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Third-Party Testing Labs

Independent third-party testing is essential for verifying peptide purity, identity, and safety. These labs offer HPLC purity analysis, mass spectrometry identification, endotoxin testing, and sterility verification for research compounds. Always request a Certificate of Analysis (COA) before using any peptide.

Independent HPLC · Mass spec · Endotoxin verification

Research Disclaimer: This directory is for informational and educational purposes only. PathToPeptides does not endorse, certify, or guarantee the services of any listed laboratory. Always verify current lab certifications, pricing, and capabilities directly with each provider. This page does not constitute medical or legal advice.

Why Independent Testing Matters

A supplier-issued COA is produced by the same entity that manufactured the compound. Independent third-party testing provides an objective, unaffiliated quality benchmark. Research integrity depends on verified data — not self-reported claims.

HPLC Purity
High-Performance Liquid Chromatography separates and quantifies compound purity versus impurities and degradation products.
>98% target threshold
Mass Spectrometry
LCMS confirms molecular identity by matching observed mass to the expected molecular weight. Purity alone does not confirm identity.
Identity confirmation
Endotoxin (LAL)
The Limulus Amebocyte Lysate test detects bacterial endotoxins — invisible contaminants that cause fever and inflammation. Critical for injectable compounds.
<5 EU/kg/hr threshold
Sterility Testing
Detects microbial contamination in reconstituted or injectable compounds. Required for research where contamination risk is unacceptable.
Microbial absence
Heavy Metals
ICP-MS screening identifies trace heavy metal contamination from synthesis reagents, solvents, or equipment. Arsenic, lead, mercury, cadmium.
USP <232> limits

Our Independent Testing Program

We plan to send our own lots for independent testing, starting with MOTS-C 10 mg and two oral tablet SKUs at Janoshik Analytical. No lot has been sent yet; results will be registered to the lot number when the reports are on file.

🧪 Lab-tested lots & live status 🔬 How to read a Janoshik report 🔎 Look up a lot number

Lab Directory

10 labs listed — from community-standard to enterprise GMP. Prices are approximate; contact labs for current quotes.

Community Standard

Janoshik Analytical

Czech Republic — Europe

HPLC · LCMS · Endotoxin · Sterility

From $360 (GLP-1 blind test) · MOTS-c $450

Widely described as the community-standard lab. Reports verify by task number + unique key on janoshik.com; batch field appears when supplied by the submitter. Prices checked 2026-10-06. How to read a Janoshik report →

ISO Certified

ACS Peptide Testing

USA

HPLC · Mass Spec · Screening Panels

$150 – $1,500

US-based ISO-certified analytical lab. Broad testing scope from basic HPLC to comprehensive multi-analyte panels.

FREE

Finnrick Analytics

Texas, USA

HPLC Purity · Dosage · Endotoxin

FREE basic purity

Finnrick offers free testing for ~15 common peptides, US residents only, with paid tiers (standard test ~$250); it routes samples to partner labs including Janoshik. Found an 8% endotoxin positivity rate across submitted samples — significant contamination data point.

US-Based

ZyntroTest

Texas, USA

LCMS · Purity · Identity Confirmation

$200 / sample

Accessible US LCMS testing at a flat per-sample rate. Good option for researchers needing identity confirmation without enterprise pricing.

ISO 17025

Ethos Analytics

USA

Purity · Quantitation · Method Development

Quote-based

One of the few ISO 17025-accredited labs accepting individual researcher samples. Rigorous accreditation standard for measurement competence.

GMP / GLP

Eurofins BioPharma

45+ global locations

Full cGMP Suite · Stability · Characterization

Enterprise pricing

Largest global GMP testing network. Comprehensive pharmaceutical-grade analytical services. Typically used by manufacturers and CROs.

GMP

Charles River Labs

Massachusetts, USA

Peptide Bioanalysis · HPLC · SEC · Peptide Mapping

Enterprise pricing

Full pharma-grade analytical services including peptide mapping, SEC characterization, and bioanalytical method development.

ISO / GMP

SGS Life Sciences

Global (150+ countries)

Analytical · Stability · Characterization · Release Testing

Enterprise pricing

Multinational testing and certification network. Broad service portfolio from raw material testing to finished pharmaceutical product release.

FDA Registered

Pacific Biolabs

California, USA

Endotoxin · Sterility · Bioburden · LAL

$100 – $500 / test

Specialist in injectable safety testing. FDA-registered facility. Ideal for researchers requiring endotoxin and sterility validation on reconstituted compounds.

US-Based

Vericel Testing

USA

Peptide ID · Purity · Potency

$175 – $400

Fast-turnaround testing service for individual researchers. Accessible pricing with results in 5–10 business days for standard panels.

How to Read a Certificate of Analysis (COA)

A COA is only as credible as the lab that issued it. Supplier-issued COAs should be treated as a starting point, not a verification endpoint. Here is what to look for in any COA:

HPLC Purity >98%
Most research applications require >98% purity by HPLC. Some highly complex peptides may be acceptable at >95%. Anything below 95% warrants further investigation.
Mass Spec Confirmation
The COA should include an observed molecular weight matching the theoretical mass (within 1 Da or within 0.1% for large peptides). No mass spec = no identity confirmation.
Batch / Lot Number
Each COA must reference a specific batch number. A generic COA not tied to your specific lot is not a valid quality document for that sample.
Red Flags
No HPLC chromatogram, no mass spectrum, no batch number, COA issued by an entity with the same address as the vendor, or purity reported as a single number with no methodology.
Requesting Independent Testing
Contact a third-party lab directly. Provide compound name, expected MW, vial concentration, and desired tests. Retain a reference aliquot from the same vial you submit.
Test Date Currency
A COA should reflect recent testing — ideally within the last 12–18 months. Very old COAs do not reflect the current state of the compound, particularly for peptides that degrade over time.

Frequently Asked Questions

What testing labs are listed? +
The directory includes 10 independent third-party labs offering peptide purity testing. Labs range from community-focused services like Finnrick Analytics (free basic purity testing) to enterprise-grade facilities like Eurofins BioPharma and Charles River. Each listing includes testing capabilities (HPLC, LCMS, endotoxin, sterility), pricing ranges, certifications, location, and turnaround times so researchers can compare options.
How are labs verified? +
Labs are evaluated based on their analytical capabilities (HPLC, LCMS, endotoxin, sterility), accreditation status (ISO 17025, GLP, cGMP), turnaround time, pricing transparency, and track record with the peptide research community. Only labs with documented analytical methods, verifiable credentials, and established reputations are included. The directory is reviewed periodically to ensure accuracy of listings.
What tests should I get? +
At minimum, get HPLC purity analysis (confirms purity percentage) and mass spectrometry identity confirmation (LCMS, confirms molecular identity). For injectable compounds, add endotoxin testing (LAL) to verify bacterial endotoxin levels are below the FDA threshold of 5 EU/kg body weight per hour. Sterility testing is recommended for any compound intended for injection. A comprehensive panel typically costs $200-$800 depending on the lab and scope. Research-grade peptides should show greater than 98% purity by HPLC.

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