Independent side-by-side comparison of Direct Peptides UK and Hangzhou Mandy Biotechnology — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Hangzhou Mandy Biotechnology holds the stronger independent lab grade (ungraded vs C); Hangzhou Mandy Biotechnology has more published third-party tests (11 vs 0); Direct Peptides UK carries more community reviews (678).
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.
Direct Peptides UK has no independent Janoshik assays on file. Hangzhou Mandy Biotechnology: 11 independent Janoshik assays, across 11 substances, median measured purity 99.6%, most recent 2026-01-23.
| Attribute | Direct Peptides UK | Hangzhou Mandy Biotechnology |
|---|---|---|
| Independent lab grade | Not graded | C |
| Third-party tests | None published | 11 tests, avg purity 98.4% |
| Community rating | 4.3/5 (678 reviews) | No reviews |
| COA available | Yes | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Year established | 2015 | Unknown |
| Substance | Direct Peptides UK | Hangzhou Mandy Biotechnology |
|---|---|---|
| Rt30 | Not tested | 99.90% (1 assay, latest 2026-01-23) |
| Hgh24iu. | Not tested | 97.31% (1 assay, latest 2025-12-30) |
| HGH 24iu. | Not tested | 96.25% (1 assay, latest 2025-12-22) |
| Klow80 BPC Tb500 Ghk-cu KPV 80mg | Not tested | purity not reported (1 assay, latest 2025-10-29) |
| Mots-c 10mg | Not tested | 99.56% (1 assay, latest 2025-09-09) |
| HGH 10iu | Not tested | 93.30% (1 assay, latest 2025-09-09) |
| Tesamorelin 10mg | Not tested | 99.32% (1 assay, latest 2025-09-01) |
| Nad+ 500mg | Not tested | purity not reported (1 assay, latest 2025-08-28) |
| Tb500 5mg | Not tested | 99.79% (1 assay, latest 2025-08-28) |
| Retatrutide 40mg | Not tested | 99.85% (1 assay, latest 2025-08-28) |
| Tirzepatide 40mg | Not tested | 99.93% (1 assay, latest 2025-08-28) |
| Checked | Direct Peptides UK | Hangzhou Mandy Biotechnology |
|---|---|---|
| Certificates of analysis | None found on the site | None found on the site |
| Products listed | 32 | 264 |
| Payment methods | Bank Transfer | Cryptocurrency |
| Ships to | United States, Worldwide | United States, Europe, Worldwide |
| Carriers | Not stated | DHL, FedEx, UPS, USPS, EMS, TNT |
| Research-use-only notice | Published | Not stated |
| Stated origin | United States | Hong Kong |
Hangzhou Mandy Biotechnology. Direct Peptides UK has no independent Janoshik assays on file. Hangzhou Mandy Biotechnology: 11 independent Janoshik assays, across 11 substances, median measured purity 99.6%, most recent 2026-01-23. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on Direct Peptides UK's site, and we found no certificates of analysis anywhere on Hangzhou Mandy Biotechnology's site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Direct Peptides UK states it ships to United States, Worldwide, and Hangzhou Mandy Biotechnology states it ships to United States, Europe, Worldwide. Both are read from the vendors' own sites.
Full profiles: Direct Peptides UK, Hangzhou Mandy Biotechnology.
Full lab-test records: All 11 Hangzhou Mandy Biotechnology lab tests.
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