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 Melanotan II from Peptide Crafters. Their purity results ranged from 99.4% to 99.7%.
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 close (8.2 to 9.3 mg).
✓ Multi-Lab Verified
·
Fair · 5.6
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.
Melanotan II from Peptide Crafters
batch PC-Z-MT210 · cross-tested by 2 independent labs
Independent labs agree on this batch within 0.5 RV-score points. Strong cross-validation.
✓ Batch identity basis: Same physical sample (Finnrick multi-lab program)
All records carry Finnrick (FNR-*) task IDs, meaning one physical vial was routed by Finnrick to multiple labs and each lab tested it independently. This is the strongest basis for 'same batch' — there's no batch heterogeneity between labs because there's no batch difference: it's the same vial.
🧞 Identity caveat — DISTINCT from Melanotan I (afamelanotide). Never merge.
Labs
2
Tests
4
RV Score Mean
5.57
RV Score Spread
0.16
Content Mean
8.7 mg
Content moderate
Content Range
8.2–9.3 mg
CV 5.2%
Per-Lab Breakdown
All rows (Purity & Content vary, everything else constant): Label 8.5 · Custody 4.3 · CI 10.0 · Method HPLC
| Lab | Task | Test Date | RV | Purity | Content | Testing | Label | Custody | CI | Method |
|---|---|---|---|---|---|---|---|---|---|---|
| Chromate | #FNR-2zlq614 | 5.65 | 99.73% | 9.3 mg | 3.1 | 8.5 | 4.3 | 10.0 | HPLC ~ | |
| Chromate | #FNR-fi2ot0t | 5.65 | 99.73% | 9.1 mg | 3.1 | 8.5 | 4.3 | 10.0 | HPLC ~ | |
| MZ Biolabs | #FNR-g8pllgz | 5.49 | 99.40% | 8.3 mg | 2.7 | 8.5 | 4.3 | 10.0 | HPLC | |
| MZ Biolabs | #FNR-1yrqhl4 | 5.49 | 99.47% | 8.2 mg | 2.7 | 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.