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Mazdutide lab tests

32 certificates of analysis for Mazdutide are on file, from 25 shops and 11 labs. The latest was tested on .

These are certificates shops have chosen to publish, verified for authenticity before listing. Because shops decide which COAs to make public, the set reflects the batches they published rather than every production batch — a selection bias we state openly. What shop COAs show →

Tests on file
32
all single vials
Median purity
99.66%
usual 99.19–99.92% · shop COAs
Measured vs label
105%
median · 2 under 90% · 4 over 120%
Latest test
11 labs · 25 shops
Look up your vial's lot →Mazdutide prices →Get a vial tested

What Mazdutide results look like

single vials only · 32 purity results · 32 measured-content results

Purity is tightly bunched: the middle 80% of results sit within 0.7 points. Measured content spreads across 26 points of the label.

HPLC purity
99.19–99.92%middle 80% of results
median 99.66%97% at 99% or higher0 under 98%
% HPLC purity
Measured content vs label
94–120%middle 80% of results
median 105%2 under 90%4 over 120%
% of the labelled amount
outside the usual rangeEndotoxin reported on 3 of 32 (9%)Confirmed on the lab's own portal: 4 (13%)Most tested size: 10 mg (19), then 6 mg (5) and 5 mg (3)

Latest Mazdutide tests

10 most recent · all formsAll 32 ↓
Latest Mazdutide lab tests
TestedShopLabPurityMeasured vs labelEndotoxinRecord
Glow AminosILS Laboratories99.81%10.31 / 10 mg 103% of label—GL-010213✓
Real PeptidesKovera Labs99.60%12.74 / 12 mg 106% of labelPassBATCH-0322✓
RC PeptidesJanoshik Labs99.36%10.42 / 10 mg 104% of label—008
24Peptidesliquilabs99.80%10.5 / 10 mg 105% of labelPassGF-MAZ10-B241
Offline Peptidesfreedomdiagnosticstesting.com99.44%4.65 / 5 mg 93% of label—OP-MDTS-0426✓
Umbrella LabsVanguard Laboratory99.80%15.18 / 20 mg 76% of labelCheck label—ULP-49141
Bluum PeptidesBioRegen99.72%4.8 / 5 mg 96% of label—MAZ052512-1F
NuScience Peptidesfreedomdiagnosticstesting.com99.50%11.03 / 10 mg 110% of label—00812
24Peptidesliquilabs99.80%9.92 / 10 mg 99% of labelPassGF122025096
Felix Chemical Supplyfreedomdiagnosticstesting.com99.42%9.96 / 10 mg 100% of label—020526-M10-0
98% or higher95–98%90–95%under 90%✓ found on the lab's own portalHover an endotoxin chip for the lab's exact wording

Results by lab

single vials · labs with the most Mazdutide tests
Mazdutide single-vial results by testing lab
LabTestsMedian purityMedian measured vs labelEndotoxin reportedConfirmed on lab portal
Janoshik Labs899.30%110%01
freedomdiagnosticstesting.com799.42%100%01
Chromate499.66%112%00
BioRegen399.92%96%00
Differences reflect the vials each lab received and how it reports — this is not a ranking of labs. Every lab with a Mazdutide test on file is linked under More on Mazdutide.

What the Mazdutide record shows

Mazdutide's record holds 32 certificates from 25 shops, tested by 11 labs between April 2024 and July 2026. Reported HPLC purity ran from 98.03% to 99.98% (median 99.66%). Measured content ran from 76% to 135% of the label (median 105%); 2 vials came in under 90%. 19 of the 32 vials were labelled 10 mg. 3 certificates include an endotoxin result, and 4 were confirmed on the lab's own portal.

Generated from the table below · updates with every new certificate

Every published Mazdutide test

32 · newest first
32 records, most recent first.
TestedShopLabPurityMeasured vs labelEndotoxinRecord
Glow AminosILS Laboratories99.81%10.31 / 10 mg 103% of label—GL-010213✓
Real PeptidesKovera Labs99.60%12.74 / 12 mg 106% of labelPassBATCH-0322✓
RC PeptidesJanoshik Labs99.36%10.42 / 10 mg 104% of label—008
24Peptidesliquilabs99.80%10.5 / 10 mg 105% of labelPassGF-MAZ10-B241
Offline Peptidesfreedomdiagnosticstesting.com99.44%4.65 / 5 mg 93% of label—OP-MDTS-0426✓
Umbrella LabsVanguard Laboratory99.80%15.18 / 20 mg 76% of labelCheck label—ULP-49141
Bluum PeptidesBioRegen99.72%4.8 / 5 mg 96% of label—MAZ052512-1F
NuScience Peptidesfreedomdiagnosticstesting.com99.50%11.03 / 10 mg 110% of label—00812
24Peptidesliquilabs99.80%9.92 / 10 mg 99% of labelPassGF122025096
Felix Chemical Supplyfreedomdiagnosticstesting.com99.42%9.96 / 10 mg 100% of label—020526-M10-0
Kimera Chemsfreedomdiagnosticstesting.com99.30%9.37 / 10 mg 94% of label—KC-MAZ-RED1
Kimera ChemsTrustPointe Analytics99.78%12.21 / 10 mg 122% of label—KC-MAZ-RED1
Loti LabsSR Bio Labs99.70%10.29 / 10 mg 103% of label—LOT-MAZD-00002
Iron Peptidesfreedomdiagnosticstesting.com99.40%10 / 10 mg 100% of label—View record →
Aavant PeptidesJanoshik Labs99.25%4.65 / 4 mg 116% of label—967290-00001 (teal cap)✓
RUO.bioJanoshik Labs99.83%10.46 / 10 mg 105% of label—maz001
Bluum PeptidesBioRegen99.92%8.78 / 10 mg 88% of label—View record →
Happy PeptidesBioRegen99.92%10 / 10 mg 100% of label—MZD0701
Felix Chemical SupplyChromate99.17%16.63 / 15 mg 111% of label—081125-M15-Y
Growth GuysJanoshik Labs99.62%10.71 / 10 mg 107% of label—MAZ01
Luvion Bio Peptidesfreedomdiagnosticstesting.com99.77%10.41 / 10 mg 104% of label—LBL-0625-MDT10-1061
Kimera ChemsTrustPointe Analytics99.29%13.49 / 10 mg 135% of label—View record →
Peptide Prosfreedomdiagnosticstesting.com99.10%10.17 / 10 mg 102% of label—MAZ-050125
Felix Chemical SupplyChromate99.61%16.89 / 15 mg 113% of label—040825-M15-A
Pura PeptidesChromate99.72%11.15 / 10 mg 112% of label—MAZ-1029292024
Profound AminosMZ Biolabs99.98%7.64 / 6 mg 127% of label—2025-01-23
Modern AminosChromate99.90%6.03 / 5 mg 121% of label—View record →
Optima SupplyMZ Biolabs99.95%6.97 / 6 mg 116% of label—2024-08-05
Optima SupplyJanoshik Labs99.19%6.86 / 6 mg 114% of label—Mazdutide-6027
Hydro Research PeptidesJanoshik Labs99.19%6.86 / 6 mg 114% of label—Mazdutide-6015
Strate LabsJanoshik Labs98.03%10.54 / 10 mg 105% of label—241
Polaris PeptidesJanoshik Labs99.83%6.8 / 6 mg 113% of label—POL-MZ6-1

Measured amount in amber when it is under 90% or over 130% of the label; Check label when it is under 80% or over 150%. Records without a lot number link as View →.

Seven checks for any Mazdutide certificate

  1. Batch-matched and independent. The certificate names the lot in your hands and comes from a lab the vendor neither owns nor pays.
  2. Purity against the range. Read the figure against what other certificates for this compound report. How to read HPLC and mass-spec results
  3. Mass-spec identity. Only mass spectrometry shows which molecule is in the vial.
  4. Net content, measured. Purity and quantity are separate questions. Why 10 mg isn't 10 mg
  5. Endotoxin on the batch. A missing line means not tested, not passed. Endotoxin testing and LAL interpretation
  6. A lab you can check. Named on the certificate, with a way to verify it. Testing labs we track · Red flags in a certificate of analysis
  7. What no test shows. A clean certificate says nothing about efficacy, dosing or long-term safety.
Want a vial tested yourself? How to send a peptide for independent HPLC testing →

Related lab tests

More on Mazdutide

Mazdutide — compound profilewhat it is, shops, purityMazdutide prices$/mg across lab-tested shopsCOA benchmarkswhat shop COAs show and leave outGet a peptide testedlabs, prices, what to orderCheck your viallook up a lot number

Labs with Mazdutide tests on file (11): ILS Laboratories, Kovera Labs, Janoshik Labs, liquilabs, freedomdiagnosticstesting.com, Vanguard Laboratory, BioRegen, TrustPointe Analytics, SR Bio Labs, Chromate, MZ Biolabs