MZ Biolabs is a mass spectrometry lab in Tucson, Arizona that tests compound purity by HPLC-UV and identity by mass spec, and its certificates appear on several research peptide sites. It doesn't test endotoxin, sterility or heavy metals under its purity service, and it doesn't run a public lookup, so verifying a report means contacting the lab. 7 vendors in our directory cite it as of October 21, 2026.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. It contains no dosing or use guidance.
Who runs MZ Biolabs
MZ Biolabs' website lists its address as 2102 N Country Club Rd, Suite C, Tucson, AZ 85716. Its about page names Ken Pendarvis, analytical chemist and owner, as founder, plus staff analytical chemists and a microbiologist. It describes the lab as offering mass spectrometry testing and research services, including metabolomics, proteomics and custom method development, for research, medical and veterinary clients. We didn't find a legal entity name on the site.
Vendors often shorten the name to "MZ Bio," which is how our directory files it. Spartan Peptides' COA page names MZ Biolabs with the same Tucson address and website, and its posted reports are signed by Ken Pendarvis, so that's the entity covered here.
Accreditation and licensing. We found no ISO/IEC 17025 accreditation, body or certificate number on the site as of October 21, 2026. Its techniques page says its linear ion trap is operated under Good Laboratory Practice. Its homepage says the lab is DEA licensed and gives a registration number, and its COA page calls it a "US DEA Schedule III licensed facility." DEA's registration lookup requires an account, so we couldn't confirm it independently. A DEA registration lets a lab handle controlled substances. It says nothing about test quality.
What it tests
From MZ Biolabs' COA testing page and techniques page:
| Test | Offered? | Detail |
|---|---|---|
| Purity | Yes | HPLC with UV detection on Waters Acquity UPLC systems |
| Identity | Yes | Mass spectrometry; three Bruker Compact QTOF instruments and a Thermo LTQ Velos Pro ion trap |
| Quantity | For formulations | Quantification of solutions, tablets and capsules |
| Endotoxin | No | "Purity testing does not test for activity, sterility/endotoxins, heavy metals, or pH" |
| Sterility | No | Same statement |
| Heavy metals | No | Same statement |
The lab says it "typically" tests purified compounds, meaning raw powders. It doesn't publish prices or turnaround times.
A Spartan Peptides BPC-157 report, analyzed May 12, 2026 and issued May 27, 2026, shows the typical format: an HPLC purity figure and an expected versus measured molecular mass, with a lot number. It doesn't report a measured quantity per vial.
How to verify an MZ Biolabs report
MZ Biolabs doesn't publish a COA lookup or verification codes. Its site has a client login, but no public search. So the check is manual:
- Read the header. The report should name MZ Biolabs with the Tucson address, a date and the client.
- Contact the lab directly using details from mzbiolabs.com, not from the vendor's page. Give it the client name, compound, lot and dates, and ask it to confirm the report and its results.
- Compare whatever the lab confirms with the vendor's copy.
- Match the lot to your vial. Spartan, for example, tells customers to verify lots through its own support, which is a vendor check, not a lab check.
Without a lab-hosted copy, an MZ Biolabs PDF on a vendor site is harder to authenticate than a report from a lab with a public lookup.
What an MZ Biolabs COA does and doesn't prove
| It shows | It doesn't show |
|---|---|
| Purity of the submitted sample by HPLC-UV | Endotoxin, sterility or heavy metals |
| Molecular mass consistent with the expected peptide | Net content per vial, unless quantification was ordered |
| The lot and client the vendor reported | That the sample came from your lot |
| The date of analysis | That the PDF matches the lab's records, without contacting the lab |
A mass spec identity check is a strength: it confirms the molecule's mass, not just a retention time. But a purity-and-identity report alone leaves out safety panels. Our endotoxin guide explains why that matters, and the HPLC purity guide covers purity numbers.
Vendors in our directory that cite MZ Biolabs
From our vendor directory data, checked October 19-21, 2026. "Lot numbers shown" means the vendor's COA page shows lot or batch numbers next to its certificates. A "Mentions endotoxin testing" entry refers to the vendor's site overall; MZ Biolabs itself doesn't run that test, so it would come from another lab.
| Vendor | Lot numbers shown with COAs | Mentions endotoxin testing | Note |
|---|---|---|---|
| Umbrella Labs | Not confirmed | Not confirmed | Also sells SARMs (per its own site title) |
| Sports Technology Labs | Yes | Not confirmed | Also sells SARMs (per its own site title) |
| Spartan Peptides | Yes | Not confirmed | - |
| PurePeptides | Not confirmed | Yes | - |
| Warrior Makers | Not confirmed | Yes | - |
| Profound Aminos | Yes | Not confirmed | - |
| YourFitnessPeptides | Yes | Not confirmed | - |
Work through any report with our COA checklist, and see third-party tested peptides for vendors with independent results.
Checked October 21, 2026 against MZ Biolabs' public website. We aren't affiliated with MZ Biolabs.
