Lab records by peptide
Mazdutide vendors
Vendors that sell Mazdutide, ranked by what independent labs found in their vials: 29 tests across 11 shops since April 2025. 5 shops graded A or B for Mazdutide; 1 shop graded D or E.
- 62%of Mazdutide tests passed; median purity 99.58%
- 8%of vials held more than 5% less Mazdutide than the label
- Most common failurepurity under 99.5% (11 tests)
- Last 90 days6 tests from 5 shops, 3 failed. Newest result Nov 25, 2025.
Mazdutide vendors ranked by lab record
The grade is for Mazdutide only, not the shop's whole catalog. A shop can pass on one peptide and fail on another. Shops with the same grade are ordered by number of tests.
| Vendor | Grade | Tests | Passed | Median purity | Under-filled | Last test |
|---|---|---|---|---|---|---|
| Planet Peptide | A | 3 | 3/3 | 99.71% | 0/3 | May 6, 2025 |
| Polaris Peptides | A | 3 | 3/3 | 99.66% | 0/3 | May 6, 2025 |
| Tydes | A | 3 | 3/3 | 99.58% | 0/3 | Apr 30, 2025 |
| Uther | A | 2 | 2/2 | 99.78% | 0/2 | Oct 9, 2025 |
| LN Peptides | A | 1 | 1/1 | 99.69% | 0/1 | Oct 9, 2025 |
| Peptide-SLast failure Nov 25, 2025: purity under 99.5% | C | 4 | 3/4 | 99.63% | 1/4 | Nov 25, 2025 |
| Skye PeptidesLast failure May 20, 2025: purity under 99.5% | D | 5 | 3/5 | 99.50% | 0/5 | Aug 16, 2025 |
| Elite Research USALast failure Nov 25, 2025: purity under 99.5% | – | 3 | 0/3 | 99.34% | 1/3 | Nov 25, 2025 |
| Nuscience PeptidesLast failure May 6, 2025: purity under 99.5% | – | 2 | 0/2 | 94.55% | 0/2 | May 6, 2025 |
| Pharma Grade PeptidesLast failure May 6, 2025: purity under 99.5%; amount in the vial more than 35% off the label | – | 2 | 0/2 | 98.72% | – | May 6, 2025 |
| Bulk Peptide SupplyLast failure Nov 25, 2025: purity under 99.5%; amount in the vial more than 35% off the label | – | 1 | 0/1 | 99.39% | – | Nov 25, 2025 |
Recent failed Mazdutide tests
The newest results that failed, with the reason and the lab's certificate. Check whether your batch number matches before you trust a shop's own paperwork.
- Elite Research USANov 25, 2025 · Krause Analyticalpurity under 99.5% · purity 99.34% · fill -7.0% · Certificate
- Peptide-SNov 25, 2025 · Krause Analyticalpurity under 99.5% · purity 98.74% · fill -7.0% · Certificate
- Bulk Peptide SupplyNov 25, 2025 · Krause Analyticalpurity under 99.5%; amount in the vial more than 35% off the label · purity 99.39% · fill +97.0% · Certificate
- Elite Research USAAug 4, 2025 · Janoshikpurity under 99.5% · purity 99.13% · fill +13.0% · Certificate
- Elite Research USAJun 27, 2025 · Chromatepurity under 99.5% · purity 99.40% · fill +8.0% · Certificate
- Skye PeptidesMay 20, 2025 · Janoshikpurity under 99.5% · purity 99.07% · fill +13.0% · Certificate
Before you order Mazdutide
- Look at the shop's grade for Mazdutide, not its average. Skye Peptides has the most Mazdutide tests (5); a shop with one or two tests has not shown it is consistent.
- 10% of these vials were bought and sent in by customers; the rest were sent by Finnrick or by the shop itself. Results from vials a shop chose to send are the weakest evidence.
- 4 labs tested them, mostly Chromate and Krause Analytical. Ask for the certificate for your batch and check it on the lab's own site.
- Run the vendor checklist before paying, and read how the grades work.
Research peptides are sold for laboratory use only. This page reports lab results; it is not medical advice.