Lab records by peptide
PT-141 vendors
Vendors that sell PT-141, ranked by what independent labs found in their vials: 156 tests across 45 shops since March 2025. 16 shops graded A or B for PT-141; 17 shops graded D or E.
- 65%of PT-141 tests passed; median purity 99.81%
- 27%of vials held more than 5% less PT-141 than the label
- Most common failurepurity under 99.5% (41 tests). In 4 vials the lab could not confirm it was PT-141 at all.
- Last 90 days16 tests from 13 shops, 0 failed. Newest result Oct 12, 2026.
PT-141 vendors ranked by lab record
The grade is for PT-141 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 |
|---|---|---|---|---|---|---|
| Peptide Sciences | A | 6 | 6/6 | 99.81% | 2/6 | Aug 12, 2025 |
| Bulk Peptide Wholesale | A | 4 | 4/4 | 99.90% | 2/4 | Aug 28, 2026 |
| Peptidology | A | 4 | 4/4 | 99.88% | 0/4 | Aug 11, 2025 |
| Uther | A | 4 | 4/4 | 99.91% | 1/4 | Apr 28, 2026 |
| Biolongevity Labs | A | 3 | 3/3 | 99.65% | 2/3 | Aug 12, 2025 |
| Nexaph | A | 3 | 3/3 | 99.90% | 1/3 | Apr 28, 2026 |
| Shanghai ERP peptide Biotechnology | A | 3 | 3/3 | 99.90% | 0/3 | Jul 20, 2026 |
| Shanxi Qianyecao Biotech QYC | A | 3 | 3/3 | 99.90% | 1/3 | Sep 5, 2026 |
| Yiwu Aozuo Trading Co | A | 3 | 3/3 | 99.90% | 0/3 | May 20, 2026 |
| ZLZ Peptide | A | 3 | 3/3 | 99.80% | 2/3 | Aug 9, 2026 |
| Bulk Peptide Supply | A | 2 | 2/2 | 99.87% | 0/2 | Oct 3, 2025 |
| Orbitrex Peptides | A | 2 | 2/2 | 99.90% | 0/2 | Jul 17, 2026 |
| Warrior Makers | A | 2 | 2/2 | 99.90% | 0/2 | Oct 12, 2026 |
| Zenith Jove Peptide ZJ | A | 2 | 2/2 | 99.90% | 0/2 | Jul 23, 2026 |
| HK PeptidesLast failure Mar 10, 2026: amount in the vial more than 35% off the label | B | 7 | 6/7 | 99.80% | 1/6 | Mar 10, 2026 |
| Reta-PeptideLast failure Nov 25, 2025: purity under 99.5% | B | 6 | 5/6 | 99.92% | 2/6 | Aug 15, 2026 |
| LiliPeptideLast failure Feb 2, 2026: purity under 99.5% | C | 10 | 7/10 | 99.90% | 3/9 | Oct 12, 2026 |
| Qing Li PeptideLast failure Mar 2, 2026: purity under 99.5% | C | 7 | 5/7 | 99.70% | 1/7 | Sep 4, 2026 |
| Allen Biotechnology Co ABCLast failure Feb 2, 2026: purity under 99.5% | C | 4 | 3/4 | 99.72% | 1/4 | Feb 20, 2026 |
| ZePeptideLast failure Mar 2, 2026: purity under 99.5% | C | 4 | 3/4 | 99.80% | 1/4 | Oct 8, 2026 |
| Polaris PeptidesLast failure Aug 19, 2025: purity under 99.5% | D | 8 | 4/6 | 99.86% | 3/6 | Aug 19, 2025 |
| Paramount PeptidesLast failure Apr 25, 2025: purity under 99.5% | D | 3 | 2/3 | 99.89% | 0/3 | May 7, 2025 |
| Planet PeptideLast failure Apr 25, 2025: amount in the vial more than 35% off the label | D | 3 | 2/3 | 99.76% | 0/3 | May 7, 2025 |
| Shanghai Sigma Audley SSALast failure Oct 23, 2025: purity under 99.5% | E | 5 | 2/5 | 99.67% | 1/5 | Oct 23, 2025 |
| Atomik LabzLast failure May 7, 2025: purity under 99.5% | E | 4 | 2/4 | 99.27% | 0/4 | May 21, 2025 |
| OupeptideLast failure Jul 13, 2026: the lab could not confirm it was the labelled peptide | E | 4 | 2/4 | 99.88% | 1/3 | Jul 13, 2026 |
| Verified PeptidesLast failure Mar 16, 2025: purity under 99.5% | E | 4 | 2/4 | 99.59% | 0/4 | May 7, 2025 |
| Wuhan Wansheng BiotechnologyLast failure Jan 19, 2026: purity under 99.5% | E | 4 | 2/4 | 99.93% | 1/4 | Jan 19, 2026 |
| BeiBangAnLast failure Dec 29, 2025: amount in the vial more than 35% off the label | E | 3 | 1/3 | 99.80% | 1/3 | Dec 29, 2025 |
| HkRoidsLast failure Jun 1, 2026: the lab could not confirm it was the labelled peptide | E | 3 | 1/3 | 98.30% | 1/2 | Jun 1, 2026 |
15 more shops with PT-141 tests
- Tianjin Ruiwang New Material Technology Co · 3 tests · grade E
- Xingruida XDR · 3 tests · grade E
- Biolabshop Limited · 2 tests · grade E
- HXNet · 2 tests · grade E
- NuLife Peptides · 2 tests · grade E
- Peptide Technologies · 2 tests · grade E
- Pharma Grade Peptides · 2 tests · grade E
- Deuschem · 4 tests
- Peptide Gurus · 3 tests
- Nuscience Peptides · 2 tests
- Pure Tested Peptides · 2 tests
- Science · 2 tests
- SRY Labs · 2 tests
- Amino Asylum · 1 test
- BioPrecise LLC · 1 test
Recent failed PT-141 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.
- OupeptideJul 13, 2026 · Krause Analyticalthe lab could not confirm it was the labelled peptide · Certificate
- HkRoidsJun 1, 2026 · BTLabsthe lab could not confirm it was the labelled peptide · Certificate
- NuLife PeptidesMay 6, 2026 · Krause Analyticalamount in the vial more than 35% off the label · purity 99.90% · fill +39.0% · Certificate
- Tianjin Ruiwang New Material Technology CoApr 28, 2026 · Krause Analyticalthe lab could not confirm it was the labelled peptide · Certificate
- HK PeptidesMar 10, 2026 · Krause Analyticalamount in the vial more than 35% off the label · purity 99.70% · fill +72.0% · Certificate
- Qing Li PeptideMar 2, 2026 · Krause Analyticalpurity under 99.5% · purity 99.24% · fill 0.0% · Certificate
PT-141 vendors that closed or went offline
Each status is quoted from its source. A shop with no working website may still sell through messaging apps, which is a reason for more caution, not less.
- Tianjin Ruiwang New Material Technology CoWebsite domain does not resolve (Our site check) · last PT-141 test Oct 8, 2026
- Xingruida XDRWebsite homepage returns 500 (Our site check) · last PT-141 test Dec 29, 2025
- HXNetNo working storefront found (Finnrick) · last PT-141 test Jan 19, 2026
The full list is on closed peptide vendors.
Before you order PT-141
- Look at the shop's grade for PT-141, not its average. LiliPeptide has the most PT-141 tests (10); a shop with one or two tests has not shown it is consistent.
- 55% 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.
- 5 labs tested them, mostly Krause Analytical and Chromate. 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.