Independent side-by-side comparison of Reta-Peptide and Royal Peptides — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Royal Peptides holds the stronger independent lab grade (D vs C); Royal Peptides shows higher average tested purity (99.7% vs 99.5%); Reta-Peptide has more published third-party tests (19 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.
Reta-Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.6%, most recent 2025-11-20. Royal Peptides: 2 independent Janoshik assays, across 2 substances, median measured purity 99.7%, most recent 2025-02-05.
| Attribute | Reta-Peptide | Royal Peptides |
|---|---|---|
| Independent lab grade | D | C |
| Third-party tests | 19 tests, avg purity 99.5% | 2 tests, avg purity 99.7% |
| COA available | No | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Substance | Reta-Peptide | Royal Peptides |
|---|---|---|
| Tirzepatide 30mg | 99.78% (1 assay, latest 2025-07-22) | 99.69% (1 assay, latest 2024-09-23) |
| Tirzepatide 60mg | 99.83% (2 assays, latest 2025-04-18) | 99.81% (1 assay, latest 2025-02-05) |
| Tesamorelin | 99.34% (2 assays, latest 2025-11-19) | Not tested |
| KLOW (ghk Or Ghk-cu/ Tb-500/ Bpc-157/ Kpv) | purity not reported (1 assay, latest 2025-11-20) | Not tested |
| Bpc-157/tb-500 Blend | purity not reported (1 assay, latest 2025-11-20) | Not tested |
| Cjc-1295 With DAC 5 | 98.28% (1 assay, latest 2025-11-19) | Not tested |
| Cagrilintide | 99.34% (1 assay, latest 2025-11-19) | Not tested |
| Semaglutide | 99.62% (1 assay, latest 2025-11-19) | Not tested |
| Retatrutide | 99.48% (1 assay, latest 2025-11-19) | Not tested |
| Tirzepatide | 99.86% (1 assay, latest 2025-11-19) | Not tested |
| Tesamorelin 10mg | 99.08% (1 assay, latest 2025-07-19) | Not tested |
| Cagrilintide 10mg | 99.66% (1 assay, latest 2025-07-19) | Not tested |
| Checked | Reta-Peptide | Royal Peptides |
|---|---|---|
| Certificates of analysis | None found on the site | 16 published on the site |
| Products listed | 35 | 133 |
| Public pricing | Listed on the site | Listed on the site |
| Payment methods | Cryptocurrency, Bank Transfer | Cryptocurrency, Bank Transfer, Credit Card, PayPal |
| Ships to | United States, United Kingdom, Canada, Australia, New Zealand | United States, Europe, Canada, Worldwide |
| Carriers | DHL, FedEx, UPS, USPS | Not stated |
| Research-use-only notice | Not stated | Published |
| Stated origin | China | Not stated |
Reta-Peptide. Reta-Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.6%, most recent 2025-11-20. Royal Peptides: 2 independent Janoshik assays, across 2 substances, median measured purity 99.7%, most recent 2025-02-05. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
Tirzepatide 30mg has been independently assayed for both. Reta-Peptide measured a median 99.78% across 1 assay; Royal Peptides measured 99.69% across 1. Purity reflects the lots actually tested, not every batch either vendor sells.
We found no certificates of analysis anywhere on Reta-Peptide's site, and Royal Peptides publishes 16 certificates of analysis on its own site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Reta-Peptide states it ships to United States, United Kingdom, Canada, Australia, New Zealand, and Royal Peptides states it ships to United States, Europe, Canada, Worldwide. Both are read from the vendors' own sites.
Full profiles: Reta-Peptide, Royal Peptides.
Full lab-test records: All 19 Reta-Peptide lab tests, All 2 Royal Peptides lab tests.
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