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Janoshik Analytical

Methods aligned with ISO 17025

Janoshik s.r.o. · Czech Republic

Official site Verify a Janoshik COA

Snapshot

Legal entity
Janoshik s.r.o.
Location
Prague area
Founded
Legal entity registered 25 Oct 2022; testing operations predate the formal s.r.o. registration.
Key people
Founded by Peter Magic (a.k.a. "Janoshik"), a former amateur weightlifter; privately held.
Languages
English, Czech
Time zone
Central European Time (UTC+1 / +2)
Turnaround

~12-20 days

Lab states an average of ~96 hours with up to 21 days guaranteed. Sterility runs ~14 days, heavy metals ~20 days.

Summary

Probably the most renowned and transparent laboratory in 3rd party peptide testing. Expensive shipping if out of country.

Accreditation

Methods aligned with ISO 17025

Janoshik states its routine methods are validated and adhere to GLP, European Pharmacopoeia, and ISO standards (the lab's website references ISO 17025 / ISO 9001). We present this as method alignment because the lab does not appear in a public accreditation-body registry for these assays. Janoshik is a registered Czech company running pharma-grade instrumentation with disclosed methods and error margins, and in 2026 it is widely treated as the de-facto community standard for peptide and research compound testing.

Equipment & methods

UHPLCHPLC-UVHPLCHR-LC-MSLC-MSGC-MSNMRXRFCHNS

Shimadzu UHPLC and Prominence HPLC systems (with redundancy); HPLC-UV for purity and quantity; LC-MS and GC-MS for identity and screening; high-field NMR and HR-LC-MS for novel-compound work; CHNS combustion analysis; XRF for heavy metals. Reagents and standards from J.T. Baker, Merck/Sigma-Aldrich, Alfa Aesar, EDQM, and Steraloids. Peptide purity is calculated by normalization at 220 / 280 nm; quantity by external-standard method against EU Pharmacopoeia reference standards.

Sample prep & shipping

Accepted carriers

UPS

Peptide and HGH lyophilizate in vials — send at least one whole unreconstituted vial for the test. Raw powders — 200 mg in a sealed plastic zip-lock or a glass container. Raw peptide (and HGH) powders — at least 30 mg in a sealed glass vial to prevent the sample from absorbing moisture. In case you choose any additional tests, please consider sending additional amounts of samples for these tests. Not sending the recommended amounts may impact the accuracy of your results.

  • GCMS and LCMS — no additional piece of sample is necessary.
  • Heavy metals analysis — 1 tab/cap, 1 ml of solution, 200 mg raw powder, 1 whole vial of lyophilizate.
  • Sterility testing — 2× whole unopened peptide vial, 2× unopened 1 ml ampoule, 1× unopened 10 ml vial; unopened pieces are needed to prevent contamination before testing.
  • Endotoxin analysis — 1 vial (2 recommended) or 1 ml (2 ml recommended).
  • CHNS mass report — no additional piece of sample is necessary.
  • Iodide/Chloride analysis — 1 tablet/capsule.
  • pH measurement — no additional piece of sample is necessary.
  • Fentanyl presence analysis — no additional piece of sample is necessary.
  • TFA analysis — no additional piece of sample is necessary.

Interviews

Inside Janoshik: Full Lab Tour (Unedited)

Derek (Research Radar) · 20 Jun 2026

Long-form unedited lab tour. Most useful chapters:

  • 0:23Sterility testing & reading failed samples
  • 1:03Why 14 days is required to confirm a sterility pass
  • 3:58Endotoxin testing
  • 10:58Dedicated peptide-purity HPLCs
  • 16:32XRF / heavy-metals testing
  • 19:02Why heavy-metal alarmism is often misleading
  • 38:25Current turnaround times
  • 41:43What NMR tests and why it needs no reference standard
  • 44:50Measuring TFA (trifluoroacetic acid) in peptides
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