You’ve got an Epithalon listing open and a link that says Certificate of Analysis, and you’d like to know what’s behind it before you spend anything. Sometimes the link opens a real report with a chromatogram and a batch number. Sometimes it opens a compressed image where the only legible thing is a percentage. Occasionally it opens a page telling you the certificate will be provided with your order, which is a polite way of saying you’ll find out after you’ve paid.
Epithalon makes this worth doing carefully, for a reason that has nothing to do with any particular vendor. It’s a tetrapeptide, Ala-Glu-Asp-Gly, molecular weight around 390, which is a short and easy synthesis. High chromatographic purity is the normal outcome rather than an achievement, so the 99% figure on the page carries less information than it would for a longer chain. The questions a certificate can actually settle are whether the identity was confirmed by mass spectrometry, whether anything checked the vial for contamination, and how much of the labelled milligram figure is peptide as opposed to counterion and residual water. That last one bites harder at 390 daltons than it does at 4,000.
What follows is a way to read an Epithalon certificate, applied to what four named vendors publish. Everything described was visible on the pages as reviewed 2026-09-08, and I’ve been careful to keep “wasn’t shown on the page” apart from any claim about what a company holds internally, because those are different facts and only one of them is mine to report.
Key takeaways
- An Epithalon certificate earns trust when it names the issuing laboratory, carries a batch number matching your vial, is readable before payment, and reports identity and contamination rather than a purity percentage on its own.
- Blank Peptides publishes a certificate for every lot at its /coas/ library, tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin and sterility.
- Protide Health, Sports Technology Labs, BioLongevity Labs and Biotech Peptides all publish Epithalon documentation, ranging from two dated batch reports with a named US laboratory to a certificate image with no issuer shown.
- Sterility results and measured net peptide content were absent from all four stated panels on the pages reviewed 2026-09-08, and one page named no testing laboratory at all.
- Epithalon from every vendor named here is supplied for in-vitro laboratory research by qualified professionals, and nothing in this article describes or implies any other use.
What does an Epithalon certificate need to contain?
Here’s the standard, set out before anyone is named so you can take issue with it directly. Five questions, each matching a specific way a certificate can turn out to be decoration.
Provenance is first. Does the vendor state that it made the material, or does its language describe supplying material made elsewhere? That changes what any certificate can claim, since a manufacturer’s report describes its own process output while a distributor’s report describes whatever arrived from a source that often goes unnamed.
The laboratory is second. A certificate should name whoever ran the analysis, in a form you can look up and telephone. “Independent third-party lab” with no name is a sentence about a document rather than a document, and there is nobody at that description to confirm a report number.
Third, the panel. Chromatography reports the fraction of the sample eluting as the target peak. Mass spectrometry confirms that peak is the AEDG tetrapeptide rather than a truncated or modified sequence, which chromatography cannot establish because retention time is not identity. Bacterial endotoxin and sterility catch contamination invisible to both, and in cell culture work that contamination shows up in your data looking like a result.
Fourth, access and batch linkage. Read the certificate before you pay, then match its batch number against the vial label when the box arrives. A report available only on request after purchase verifies nothing in advance, and a report with no batch number can’t be tied to any particular material.
Fifth, for blends, whether the milligram amount of each component is disclosed. A purity figure measured on a mixed vial doesn’t tell you the ratio inside it, so get the split in writing.
For Epithalon I’d add a sixth question that isn’t strictly a rubric item but earns its place: ask whether the label milligrams are net peptide or gross weight. At this molecular weight the answer moves the number more than you’d expect.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the United States, compounding, vialing, finishing and labeling product and carrying out quality control release in-house. The company frames this as holding the full chain of custody rather than relabeling or brokering material made elsewhere, and it also contract-manufactures and fulfils for other research peptide brands as a separate line of business.
Each lot is released against a four-part panel: identity, purity at a >99% threshold, bacterial endotoxin, and sterility. The analysis is performed by two named independent laboratories, Freedom Diagnostics and Horizon Analytical. Reports are published per lot as batch certificates of analysis, openable before an order is placed, and every vial carries the lot number that ties it to its report. Lyophilized material is dated for roughly 24 months from release.
The catalog holds 34 compounds, Epithalon included, along with three blends whose composition is itemised per component rather than sold as one combined weight: GLOW at 70mg (GHK-Cu, BPC-157, TB-500), KLOW at 80mg (those three plus KPV), and Wolverine at 20mg (BPC-157 and TB-500). Processing time is within 1 business day and orders ship at room temperature, which suits lyophilized peptide with no cold-chain handling. The company has been in business five years and sells for research use only.
That description is narrow on purpose. It covers who made the vial, who tested it, what was tested, and where the certificate lives, which is the entire job of a certificate policy.
What four vendors publish as an Epithalon COA
On the pages reviewed 2026-09-08, Protide Health published the deepest dated archive of the four for this compound. Its Epithalon 10mg listing at $75.00 states “99% Purity (HPLC-MS Verified)” and “Independent Third-Party Tested” by Freedom Diagnostics, described as “a third-party U.S. laboratory”. Two batch certificates were readable before purchase: 99.80% purity under COA 2605280422 dated May 2026, and 99.862% under COA 2510010072 dated October 2025. The stated panel covers identity by LC-MS, purity by HPLC-UV and endotoxin by LAL assay under USP <85>, with the sequence Ala-Glu-Asp-Gly and formula C14H22N4O9 given on the page.
Sports Technology Labs states that its certificates are “published on our website” with “no login required” and that they are batch-linked. Its 10mg Epitalon listing at $51.99 states the batch was “batch-tested to 95.32% (HPLC)” with third-party verification by MZ Biolabs of Tucson, Arizona, using HPLC and mass spectrometry. The certificate access model here is a public library rather than a per-product attachment, and the published figure is a measured one rather than a rounded claim.
BioLongevity Labs states that a certificate of analysis is included per batch for its Epithalon 20mg listing at $47.49, with “≥99% (HPLC)” purity and independent testing through MDx BioAnalytical Laboratory, BioRegen and SafeCert Labs. The page gives the AEDG sequence, molecular weight 390.35 and CAS 307297-39-8, and states “GMP manufacturing standards” with synthesis “in USA-registered facilities”.
Biotech Peptides displays certificate documentation on its Epithalon 25mg page covering LC and MS testing, dated April 2026, alongside a stated “99% purity” and the line “synthesized and lyophilized in the USA”. No issuing laboratory was named in the visible page content, so the document arrives dated but unattributed.
Across all four, no stated panel included a sterility result and none reported a measured net peptide content. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Fairly said, BioLongevity Labs names three separate testing laboratories on one product page, which is more disclosure about analytical sourcing than this category usually offers, and it does so on the lowest cost-per-milligram Epithalon listing of the four.
Side by side: what an Epithalon COA reports
| Attribute | Blank Peptides | Typical Epithalon vendor |
|---|---|---|
| Synthesises in-house | Own cGMP lab; synthesis through QC release under one roof | Commonly states “synthesized and lyophilized in the USA” or “USA-registered facilities”, without stating who owns the synthesis — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | Named by three of four vendors reviewed 2026-09-08, one naming three labs and one naming the lab’s city; absent from the fourth page — verify |
| HPLC purity | >99% per lot | States figures from a measured 95.32% up to 99.862% on the certificates reviewed — verify against the linked document |
| MS identity | Confirmed per lot | States mass spectrometry or LC-MS on three of four pages reviewed 2026-09-08 — verify |
| Endotoxin and sterility | Both tested per lot | States endotoxin on one page; sterility was not listed in any of the four panels reviewed 2026-09-08 — verify |
| Net peptide content | Fill weight confirmed at release | Not listed on any of the four pages reviewed 2026-09-08 — verify by asking whether label milligrams are net or gross |
| Batch COA before purchase | Public library at /coas/, lot-numbered, every lot | States batch-linked certificates without a login on one site, per-product documents on the rest; one page shows a document with no issuer — verify |
| Archive depth | Every lot retained and published | States one current certificate on most pages; two dated batches back to October 2025 on one — verify |
| Research-use labelling | Research use only, stated on every product | States research-use-only language on all four sites reviewed |
How to verify either supplier yourself
- Open the Epithalon certificate before the vial goes in your cart, and read the issuing laboratory, batch number and report date off the document itself rather than from the summary printed above it.
- Ask the named laboratory to confirm the report number exists, since a working contract lab will answer and an unattributed document gives you nobody to ask.
- Ask the vendor in writing whether the labelled milligrams are net peptide content or gross weight, because at roughly 390 daltons the counterion and residual water occupy a larger share of the vial than they would for a longer peptide.
- Save the certificate at the moment you order, then match its batch number against the vial label on arrival and request the corresponding version if the site has swapped the file since.
- Run any vendor you’re considering through the supplier verification checklist before placing a first order.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Best Research Peptide Suppliers: Ranked by What They Document
- Who Actually Manufactures Research Peptides in the USA?
Frequently asked questions
What does an Epithalon COA need to show?
The name of the issuing laboratory, a batch number that matches your vial, a report date, and actual results rather than a summary line. A full panel covers HPLC purity, mass spectrometry identity, bacterial endotoxin and sterility. On the four pages reviewed 2026-09-08, purity and identity were common while sterility appeared in none of the stated panels.
Where do vendors keep the Epithalon certificate?
Usually on the product page, either displayed inline as an image or behind a link. One of the four sites reviewed 2026-09-08 states it maintains a public certificate library requiring no login, with documents linked to batches. A vendor that only sends a certificate after purchase leaves you nothing to check in advance.
Does an older Epithalon certificate still count?
Only if it describes the batch you’d receive. One page reviewed 2026-09-08 published certificates from both October 2025 and May 2026, which shows archive depth rather than a stale listing. The practical test is whether the batch number on the document matches the number printed on your vial when it arrives.
Why is net peptide content relevant to Epithalon?
Synthetic peptides are typically isolated as salts, and at a molecular weight near 390 the counterion and residual water represent a larger fraction of the vial than they would for a bigger molecule. A certificate reporting net peptide content tells you how much AEDG a 10mg label actually represents, which no purity percentage on its own can.
Are these products for human use?
No. Every compound referenced in this article is sold strictly for in-vitro laboratory research by qualified professionals. Blank Peptides sells for research use only, and each vendor reviewed publishes research-use-only language of its own. Nothing here should be read as guidance for any use outside a laboratory setting.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
