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PHRESOURCESTESTING LABS

Trusted Peptide Testing Labs

Independent third-party labs for verifying peptide identity and purity. The only way to truly confirm what you have is real: a supplier's own COA tells you what they want you to believe; a third-party lab tells you what is actually in the vial.

Why Independent Testing

Recommended Labs

  • L-01

    Janoshik Analytical

    Community Recommended

    Czech Republic

    TURNAROUND

    5–10 business days

    COST

    USD 40–80 / sample

    PRIMARY SERVICE

    HPLC purity testing

    HPLC purity testingMass spectrometry (identity)Full peptide profile

    The most community-trusted peptide testing lab globally. Used extensively by the r/Peptides community. Accepts international samples by mail. Fastest and most affordable option for most users.

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  • L-02

    Colmaric Analyticals

    USA

    TURNAROUND

    7–14 business days

    COST

    USD 60–120 / sample

    PRIMARY SERVICE

    HPLC purity

    HPLC purityIdentity confirmationSmall molecule analysis

    US-based lab with strong reputation in the research community. Uses GLP-compliant methodology. Accepts international samples. Good option for verification of higher-value peptide orders.

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  • L-03

    Micro Quality Labs

    USA (California)

    TURNAROUND

    7–21 business days

    COST

    USD 80–150 / sample

    PRIMARY SERVICE

    Research compound analysis

    Research compound analysisPeptide purityEndotoxin testing

    Broader testing scope including endotoxin and sterility testing, useful if concerned about injection safety beyond just purity. More comprehensive reports than Janoshik but higher cost.

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How to Submit a Sample

  • S-01

    Contact the lab

    Visit the website and submit a test request or email. They will send sample submission instructions and payment details.

  • S-02

    Prepare your sample

    Typically 5–20mg of lyophilized powder or a few hundred microliters of solution in a sealed container. Follow the lab's packaging instructions.

  • S-03

    Ship internationally

    Use a courier with tracking. Label as "research chemical sample." In practice, peptide powder samples rarely cause customs issues.

  • S-04

    Receive your COA

    Within the stated turnaround, you receive a COA via email showing identity, purity percentage, and any detected impurities.

  • S-05

    Compare to supplier COA

    Check identity, purity range, and impurity profile. Report discrepancies to the community.

When to Test

TriggerReason
New supplier: first orderEstablish baseline quality before committing to larger purchases.
Suspicious product qualityUnusual appearance, color, or solubility may indicate degradation or substitution.
No COA provided by supplierIf no COA exists, independent testing is your only verification option.
High-value peptide orderSpending significant money on Retatrutide or Tirzepatide warrants verification.
Verifying claimed puritySupplier claims 99%+. Verify against actual lab result.
No results or unexpected effectsCould indicate underdosing, wrong compound, or contamination.

Cost vs Benefit

Testing a USD 200 Retatrutide order with a USD 60 lab test makes strong economic sense. Testing a USD 20 BPC-157 vial is less critical if your supplier has a strong COA track record, but for any new supplier, the first test is always worth it.

BASIC PURITY

~USD 40

IDENTITY + PURITY

~USD 60–80

COMPREHENSIVE

~USD 100–150

INTL SHIPPING

~USD 20–40