Independent side-by-side comparison of PeptiAtlas and PTDS — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: PeptiAtlas holds the stronger independent lab grade (A vs ungraded); PeptiAtlas shows higher average tested purity (99.6% vs 97.9%); PeptiAtlas has more published third-party tests (4 vs 2).
Every figure below is either measured by an independent laboratory or read from the vendor's own website, and the source is named against it. PeptideAtlas is not affiliated with either vendor.
PeptiAtlas: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-04-14. PTDS: 2 independent Janoshik assays, across 2 substances, median measured purity 97.9%, most recent 2024-05-31.
| Attribute | PeptiAtlas | PTDS |
|---|---|---|
| Independent lab grade | A | Not graded |
| Third-party tests | 4 tests, avg purity 99.6% | 2 tests, avg purity 97.9% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | PeptiAtlas | PTDS |
|---|---|---|
| Ghk-cu 100mg | 99.44% (1 assay, latest 2026-04-14) | Not tested |
| Tirzepatide 20mg | 99.81% (1 assay, latest 2026-04-14) | Not tested |
| Retatrutide 20mg | 99.82% (1 assay, latest 2026-04-14) | Not tested |
| Bpc157 5mg | 99.53% (1 assay, latest 2025-07-11) | Not tested |
| Mots-c 15 Mg | Not tested | 99.59% (1 assay, latest 2024-05-31) |
| HGH W/ Dimer 24 IU | Not tested | 96.29% (1 assay, latest 2024-04-19) |
| Checked | PeptiAtlas | PTDS |
|---|---|---|
| Certificates of analysis | None found on the site | Not stated |
| Products listed | 64 | Not stated |
| Payment methods | Cryptocurrency, Bank Transfer, PayPal, Zelle, Cash App, Venmo | Not stated |
| Ships to | Worldwide | Not stated |
| Carriers | DHL, FedEx, USPS | Not stated |
PeptiAtlas. PeptiAtlas: 4 independent Janoshik assays, across 4 substances, median measured purity 99.7%, most recent 2026-04-14. PTDS: 2 independent Janoshik assays, across 2 substances, median measured purity 97.9%, most recent 2024-05-31. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on PeptiAtlas' site, and PTDS states that COAs are available. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
PeptiAtlas states it ships to Worldwide, and PTDS does not state one. Both are read from the vendors' own sites.
Full profiles: PeptiAtlas, PTDS.
Full lab-test records: All 4 PeptiAtlas lab tests, All 2 PTDS lab tests.
Related comparisons: PeptiAtlas vs InfiniWell, PTDS vs Panda Peptides LLC, PTDS vs XTP.