Independent side-by-side comparison of Healthletic and Peptides 4 Research — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Peptides 4 Research holds the stronger independent lab grade (ungraded vs D); Peptides 4 Research has more published third-party tests (2 vs 0); Healthletic carries more community reviews (450).
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.
Healthletic has no independent Janoshik assays on file. Peptides 4 Research: 2 independent Janoshik assays, across 2 substances, median measured purity 99.5%, most recent 2025-12-29.
| Attribute | Healthletic | Peptides 4 Research |
|---|---|---|
| Independent lab grade | Not graded | D |
| Third-party tests | None published | 2 tests, avg purity 99.5% |
| Community rating | 4.1/5 (450 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 | 2021 | Unknown |
| Substance | Healthletic | Peptides 4 Research |
|---|---|---|
| Cjc-1295 NO DAC 10MG | Not tested | 99.27% (1 assay, latest 2025-12-29) |
| Retatrutide 10mg | Not tested | 99.70% (1 assay, latest 2025-10-31) |
| Checked | Healthletic | Peptides 4 Research |
|---|---|---|
| Certificates of analysis | None found on the site | Not stated |
| Products listed | 20 | Not stated |
| Public pricing | Listed on the site | Not stated |
| Ships to | United States, United Kingdom, Europe, Canada, Australia, New Zealand, Worldwide | Not stated |
| Stated origin | United States | Not stated |
Peptides 4 Research. Healthletic has no independent Janoshik assays on file. Peptides 4 Research: 2 independent Janoshik assays, across 2 substances, median measured purity 99.5%, most recent 2025-12-29. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
We found no certificates of analysis anywhere on Healthletic's site, and we have not read Peptides 4 Research's site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
Healthletic states it ships to United States, United Kingdom, Europe, Canada, Australia, New Zealand, Worldwide, and Peptides 4 Research does not state one. Both are read from the vendors' own sites.
Full profiles: Healthletic, Peptides 4 Research.
Full lab-test records: All 2 Peptides 4 Research lab tests.
Related comparisons: Healthletic vs Arctic Peptide, Peptides 4 Research vs BioTech Peptides, Healthletic vs Bioslab, Peptides 4 Research vs HK Peptides, Healthletic vs Peptide-S, Peptides 4 Research vs LimitlessBioChem.