Janoshik and MZ Biolabs comparison worksheet
PurePeptideHub · 14 October 2026

Ask both laboratories the same questions before comparing their quotes.

[ ] 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 A compound-specific catalogue example is not a universal price; mark unpublished prices as quote required.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
Sourced Janoshik / MZ comparison: https://purepeptidehub.com/resources/janoshik-vs-mz-biolabs
Janoshik official website: https://janoshik.com/
MZ Biolabs COA testing: https://www.mzbiolabs.com/mzbiolabs/coa-testing/

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