PUREPEPTIDEHUB · FREE CHECKLIST

Janoshik and MZ Biolabs comparison worksheet

Ask both laboratories the same questions before comparing their quotes.

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• Describe the same material, form and intended analytical question to each laboratory. Confirm acceptance before making plans.
• List the requested results separately: identity, purity, amount, sterility and endotoxin. Do not assume a basic panel includes every test.
• Record each named method and its limits. Ask about reference standards, units and the basis of any quantitative result.
• Write down the current itemised price and currency for that exact scope. A compound-specific catalogue example is not a universal price; mark unpublished prices as quote required.
• Record the sample quantity, vial count and preparation instructions provided by each laboratory. Confirm any additional samples for add-on testing.
• Compare reporting timelines from sample receipt and ask about intake delays, additional tests and report release.
• Check report verification, sample traceability, privacy and subcontracting. Record source links and the date you checked each detail.
• Choose based on the question the methods can answer. This worksheet is not a comparative laboratory audit or an endorsement.

Sources and further reading

1. Sourced Janoshik / MZ comparison
2. Janoshik official website
3. MZ Biolabs COA testing

Prepared 14 October 2026. Educational information only. This checklist does not establish clinical safety or recommend a medicine, dose or treatment.