When more than one lab tests the same batch, we line up their results side by side. When they match, it is the strongest signal you can get. When they do not, that is information too. Here is what these labs found — you decide.
2 independent labs tested this batch of Retatrutide from EZ Peptides. Their purity results ranged from 99.7% to 99.9%.
The labs agree
Independent labs landed within 2 points of each other on purity. That is the strongest signal you can get on a batch.
On the actual amount per vial, the labs were far apart (19.8 to 27.1 mg).
✓ Multi-Lab Verified
·
Fair · 5.5
The two badges above are our blended RV-score view: whether the scores agree, and the overall quality tier. The plain read at the top leads with the labs actual purity numbers, and the full per-lab table is below.
Retatrutide from EZ Peptides
vendor batch label "EZP-RET2412162025-12" · cross-tested by 2 independent labs
Independent labs agree on this batch within 0.5 RV-score points. Strong cross-validation.
ⓘ Batch identity basis: Vendor-claimed batch: 'EZP-RET2412162025-12'
Grouped by the vendor's batch label. We don't independently verify lot identity — if multiple physical lots were sold under this label, they'd be lumped together here. Use the agreement signal with appropriate caution.
Purity agrees, content diverges. Labs converge on purity (spread 0.24pp) but disagree on the actual amount (range 19.8–27.1 mg, CV 15.6%). The compound is what it claims to be — but how much is in the vial varies measurably between labs.
Disagreement, but method data is sparse. Disagreement detected but method data is missing on too many records to attribute the cause. Once more records in this group carry resolved method info, this verdict will sharpen.
Labs
2
Tests
2
RV Score Mean
5.52
RV Score Spread
0.27
Content Mean
23.5 mg
⚠ Content diverges
Content Range
19.8–27.1 mg
CV 15.6%
Per-Lab Breakdown
All rows (Purity & Content vary, everything else constant): Testing 3.1 · CI 10.0
| Lab | Task | Test Date | RV | Purity | Content | Testing | Label | Custody | CI | Method |
|---|---|---|---|---|---|---|---|---|---|---|
| Janoshik | #95125 | 5.38 | 99.66% | 27.1 mg | 3.1 | 7.0 | 5.2 | 10.0 | not stated by lab | |
| Krause Analytical | #FNR-45yg2em | 5.65 | 99.90% | 19.8 mg | 3.1 | 8.5 | 4.3 | 10.0 | HPLC ~ |
Why this matters: A single COA is one lab's answer from one method on one sample. Multiple labs reveal the pattern. When labs converge on the same answer, that's strong cross-validation. When they diverge — especially on content while agreeing on purity — the difference is often method-driven (different quantitation basis) but sometimes signals real product variation. ResearchVerify is the only platform that surfaces both cases automatically across thousands of cross-tests.