Independent side-by-side comparison of PepSynth Labs and Qing Li Peptide — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Qing Li Peptide holds the stronger independent lab grade (ungraded vs C); Qing Li Peptide has more published third-party tests (19 vs 0); PepSynth Labs carries more community reviews (120).
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.
PepSynth Labs has no independent Janoshik assays on file. Qing Li Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.7%, most recent 2025-09-01.
| Attribute | PepSynth Labs | Qing Li Peptide |
|---|---|---|
| Independent lab grade | Not graded | C |
| Third-party tests | None published | 19 tests, avg purity 99.5% |
| Community rating | 4/5 (120 reviews) | No reviews |
| COA available | Yes | No |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Production country | United States | Not specified |
| Year established | 2022 | Unknown |
| Substance | PepSynth Labs | Qing Li Peptide |
|---|---|---|
| Tirzepatide 60mg | Not tested | 99.84% (3 assays, latest 2025-08-11) |
| HGH 10iu | Not tested | 97.38% (1 assay, latest 2025-09-01) |
| Tirzepatide 20mg | Not tested | 99.64% (1 assay, latest 2025-08-11) |
| GLOW 70mg | Not tested | purity not reported (1 assay, latest 2025-06-26) |
| Bpc157 10mg/TB500 Fragment 10mg Blend | Not tested | purity not reported (1 assay, latest 2025-06-25) |
| Bpc157 5mg/TB500 Fragment 5mg Blend | Not tested | purity not reported (1 assay, latest 2025-06-25) |
| KLOW 80mg(BPC+TB500+GHK-CU+KPV) | Not tested | purity not reported (1 assay, latest 2025-06-02) |
| Glutathione 1500mg | Not tested | 99.92% (1 assay, latest 2025-05-28) |
| GLOW (ghk-cu/ Tb-500/ Bpc-157 Blend) | Not tested | purity not reported (1 assay, latest 2025-05-18) |
| Epithalon 10mg | Not tested | 99.56% (1 assay, latest 2025-05-15) |
| Cjc1295 5mg+tlpamorelin 5mg Blend | Not tested | purity not reported (1 assay, latest 2025-04-16) |
| Bpc157 5mg+Tb500 5mg Blend | Not tested | purity not reported (1 assay, latest 2025-04-16) |
| Checked | PepSynth Labs | Qing Li Peptide |
|---|---|---|
| Certificates of analysis | None found on the site | 15 published on the site |
| Products listed | 34 | 63 |
| Public pricing | Listed on the site | Not stated |
| Payment methods | Not stated | Cryptocurrency, Bank Transfer, PayPal |
| Ships to | United States, Worldwide | United States, Worldwide |
| Carriers | FedEx, USPS | DHL, FedEx, EMS |
| Research-use-only notice | Published | Published |
| Stated origin | United States | Hong Kong |
Qing Li Peptide. PepSynth Labs has no independent Janoshik assays on file. Qing Li Peptide: 19 independent Janoshik assays, across 17 substances, median measured purity 99.7%, most recent 2025-09-01. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on PepSynth Labs' site, and Qing Li Peptide publishes 15 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.
PepSynth Labs states it ships to United States, Worldwide, and Qing Li Peptide states it ships to United States, Worldwide. Both are read from the vendors' own sites.
Full profiles: PepSynth Labs, Qing Li Peptide.
Full lab-test records: All 19 Qing Li Peptide lab tests.
Related comparisons: PepSynth Labs vs Maximum Peps, Qing Li Peptide vs HK Peptides, Qing Li Peptide vs Qingfuji Trading.