Uzorak is a testing laboratory in Zagreb, Croatia listed on Peptigrity. 9 certificates on file attributed to this lab, most recent 2026-06-24; 7 distinct compounds tested; 2 shops have published certificates from this lab. Stated turnaround: Standard analysis: 2–3 working days. Methods stated: HPLC and LC-MS. Verification portal: https://uzorak.com/#/verify. Claimed by the lab: no. Figures as of 2026-09-24.
Uzorak
Zagreb-based Croatian analytical laboratory positioning itself as a higher-standards entrant to the peptide testing market. Flagship service: Advanced LC-MS Peptide Analysis focused on what's actually inside the main chromatographic peak, not just main-peak size.
Average purity is of the samples Uzorak received from buyers and vendors. It describes those products, not the lab.
Turnaround
read from uzorak.com · Sep 22, 2026 → · wrong? tell us — the lab’s figure; Peptigrity doesn’t verify it. A median appears once 5 people who ordered a test themselves have reported the dates.
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About Uzorak
Uzorak is a Zagreb-based Croatian analytical laboratory positioning itself as a higher-standards entrant to the peptide testing market, bringing pharmaceutical-level analytical methodology to research-use-only compounds. Co-founded by Alex — a 12-year health-tech veteran whose prior DNA testing analytics company was acquired, working alongside experts with decades of pharmaceutical peptide testing experience — Uzorak's flagship service is an Advanced LC-MS Peptide Analysis package focused on what's actually inside the main chromatographic peak rather than just main-peak size.
Each report carries a unique verification link tied to sample ID and order number; customers control whether to share the link with vendors or community members.
What sets Uzorak apart
- ✓Standards-raising posture in an unregulated market. Uzorak explicitly argues that third-party testing standards should be *higher*, not lower, in environments where manufacturers face no regulatory oversight — the opposite of the rest of the peptide testing market's positioning. Whether the analytical execution matches the rhetoric requires CoA volume to evaluate; the posture itself is unique.
- ✓Advanced LC-MS as the flagship service, not an add-on. Unlike labs where mass spectrometry is a paid upgrade over HPLC, Uzorak leads with LC-MS analysis and includes impurity spectra in the standard report — report length scales with impurities found, so a clean sample produces a shorter report and a problematic sample produces a longer one.
- ✓Customer-controlled CoA verification. Each report has a public verification link, but the customer decides whether to share it — preserving privacy on individual testing while still allowing the verification model that public-CoA labs offer.
- ✓Co-founder with pharmaceutical industry network. Alex describes access to experts with decades of peptide testing experience at large pharmaceutical companies. He also acknowledges the gap between pharmaceutical peptide standards and the RUO market specifically.
- ✓Announced plans for an 18-element ICH Q3D heavy metal screen — aligned with FDA/EMA ICH Q3D guidelines (Class 1, 2A, PGEs, select Class 3). Would put Uzorak among a small group of peptide-market labs running pharmaceutical-grade elemental impurity panels. Buyers should confirm activation timing before relying on this service.
- Accreditation — see the note above.
- No endotoxin, sterility, or heavy metals testing in the default package as of early 2026. The 18-element ICH Q3D screen is announced but not confirmed active. Confirm current service availability before commissioning safety-relevant work.
- New lab — no track record at scale. Limited CoA volume to evaluate against; 0 tests currently in Peptigrity's lab test database. Buyers may want to start with a single submission to evaluate analytical reporting before committing volume.
- Pricing is "community standard" for HPLC-UV with discounts for initial customers, flat-price for LC-MS, and free testing offered to large test groups for comparison. Pricing model is evolving and not transparently published as a fixed rate card — request current pricing per submission.
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