Certificates of Analysis · updated October 2026
Each NeuroPept Labs research peptide is analyzed by an independent third-party laboratory for purity (HPLC), identity (LC-MS) and net peptide content. Every current certificate is published below with its lot number, the lab’s search code and a link to verify it at the source.
Freedom Diagnostics COA, lot 260602-02 · open full size
Independently tested via Finnrick
This lot has been analyzed three times by two separate laboratories. Freedom Diagnostics tested it in August 2026. In October 2026 NeuroPept Labs submitted two vials to Finnrick, the independent peptide-testing program, which anonymized the samples and had them analyzed by its partner laboratory, Krause Analytical. Both Finnrick tests passed, and the results are published on finnrick.com.
| Laboratory | Date | Purity | Net content | Identity | Result | Verify |
|---|---|---|---|---|---|---|
| Freedom DiagnosticsFranklin, TN · search code NEUR2608050352 | Aug 9, 2026 | 99.77% | 31.30 mg | Confirmed (LC-MS) | Reported | Look up at Freedom Diagnostics ↗ |
| Krause Analytical via FinnrickAustin, TX · Finnrick test a82sq3y | Oct 12, 2026 | 99.7% | 31.7 mg (105.7% of label) | Confirmed (HPLC-UV-MS) | Pass | View on finnrick.com ↗ |
| Krause Analytical via FinnrickAustin, TX · Finnrick test 2n7vsyj | Oct 12, 2026 | 99.9% | 26.1 mg (87.1% of label) | Confirmed (HPLC-UV-MS) | Pass | View on finnrick.com ↗ |
Finnrick certificates are anonymized by design: they carry a 7-character test ID instead of a vendor name or batch number, and are meant to be verified on finnrick.com rather than shared as PDFs. The results pages above show purity, measured content and identity without signing in; the original lab PDF is available there with a free Finnrick account.
The library
Click any certificate to open it full size. Each card lists the lot it covers and the lab search code for independent verification.
retatrutide
99.77% HPLC purity
NEUR2608050352 
retatrutide
99.81% HPLC purity
NEUR2607310994 
retatrutide
99.80% HPLC purity
NEUR2603050043 
tirzepatide
99.94% HPLC purity
NEUR2608050353 
GHK-Cu / BPC-157 / TB-500 / KPV
99.87% HPLC purity
NEUR2609110754 
GHK-Cu / BPC-157 / TB-500
99.60% HPLC purity
NEUR2606020021 
mitochondrial-derived peptide
99.43% HPLC purity
NEUR2609110755 
retatrutide
99.89% HPLC purity
NEUR2602190053 Don’t take our word for it
a82sq3y or 2n7vsyj at finnrick.com/verify ↗.FAQ
A COA is a laboratory report for one specific lot. It names the compound, the analytical methods used (HPLC-UV for purity, LC-MS for identity), the measured purity and net peptide content, the lot number and the report date. Every certificate on this page was issued by an independent third-party laboratory, not by NeuroPept Labs.
Freedom Diagnostics (Franklin, Tennessee) issued the current certificate for every product listed here. GLP-3RT 30mg lot 260602-02 was also analyzed twice by Krause Analytical (Austin, Texas) through Finnrick's independent testing program.
Finnrick is an independent peptide-testing organization that publishes laboratory results on finnrick.com. NeuroPept Labs submitted two vials of GLP-3RT 30mg lot 260602-02; Finnrick anonymized the samples, sent them to its partner laboratory and published both results. Both tests passed (2 of 2). Finnrick certificates are designed to be verified on finnrick.com, which is why this page links to them rather than reproducing them.
Net peptide content is measured per vial, so readings vary between individual vials and between laboratories. For lot 260602-02 the three measurements were 31.30 mg, 31.7 mg and 26.1 mg against a 30 mg label claim, and purity was 99.7% or higher in every test.
For a Freedom Diagnostics COA, copy the search code shown on its card and enter it in the COA Look Up on freedomdiagnosticstesting.com. For a Finnrick result, open the finnrick.com link: the results page shows purity, measured content and identity without signing in.
Every certificate on this page lists its lot number. For documentation on any other lot, email sales@neuropeptlabs.com with your order number.
Third-party COA for every product. Free US shipping on orders over $200.
Shop all research peptidesResearch use only. All NeuroPept Labs products are sold strictly for in vitro laboratory research. They are not drugs, foods, cosmetics or medical devices and are not for human or veterinary use. Certificates of Analysis describe the analytical characteristics of the tested lot only and make no claim about biological effect. Finnrick and Freedom Diagnostics are independent organizations; their results are not an endorsement of NeuroPept Labs.
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