Somebody sends you a PDF and calls it a COA. There’s a logo at the top, a chromatogram in the middle, a figure ending in something like 99.8%, and a signature line at the bottom. It looks exactly like reports you’ve seen from labs you trust, and from the document alone you can’t tell whether it describes the tesamorelin you’re about to order, a batch from last spring, or nothing that was ever in a vial.
That’s a hard problem and it isn’t your fault for finding it hard. Certificate templates download freely. Chromatogram images crop and paste. The phrase “third-party tested” sits on nearly every listing in this category, attached to arrangements that range from a browsable per-lot archive down to a badge graphic that isn’t a link at all. And the most common failure mode is quieter than forgery: a real report from a real laboratory that happens to describe material from a lot you’ll never receive.
Tesamorelin adds a wrinkle of its own. It’s a 44-residue chain with an acyl group on the N-terminus, which is a longer and more demanding assembly than the 29-residue analogs sitting beside it in most catalogs. Longer syntheses generate more deletion and truncation byproducts, and those byproducts are structurally close to the target, which is precisely the situation where a purity percentage on its own starts to under-report the question. So the identity line on a tesamorelin certificate earns its keep. Below I walk through what such a certificate should contain, record what four named vendors publicly showed about certificate access on their own pages as reviewed 2026-09-08, and set that against how Blank Peptides documents its own lots.
Key takeaways
- A tesamorelin certificate is only useful if you can open it before paying and it names the issuing laboratory, carries a lot number, states the method, and reports identity and contamination alongside purity.
- Blank Peptides publishes a certificate for every lot at its /coas/ library, covering identity, >99% purity, bacterial endotoxin and sterility, run by Freedom Diagnostics and Horizon Analytical.
- Of the four vendors reviewed, Protide Health links dated lot-tied certificates and names Freedom Diagnostics, Swiss Chems links to a separate lab results page, and neither Core Peptides nor Pure Rawz displayed a tesamorelin certificate on the pages reviewed.
- Only one of the four pages reviewed on 2026-09-08 listed identity, purity and endotoxin testing together for this compound.
- Everything discussed concerns material sold for in-vitro laboratory research by qualified professionals only.
What should a tesamorelin certificate of analysis actually contain?
Let me set the bar before naming anyone, because the word COA gets stretched across everything from a full analytical report to a purity figure typed onto letterhead.
Start with the header. A useful certificate names the laboratory that ran the analysis, and that name has to be checkable. If the issuer is an anonymous “independent lab”, nobody can confirm the document is genuine, and an unverifiable report sits closer to marketing copy than to evidence. The same header should carry a report number and a date, with the date recent enough that the material described plausibly overlaps with the material you’re buying.
Then the lot. This is the field people skip and later regret. A certificate with no lot number can’t be tied to any particular vial, so it describes the vendor’s product in general rather than your product in particular. When the box arrives, the label number should match the document you saved.
Then the method and the panel. HPLC reports chromatographic purity, the fraction of the sample eluting as the target peak. Mass spectrometry reports the mass of that species and confirms it’s the 44-residue acylated sequence rather than a near neighbour missing a residue or carrying an incomplete modification. Bacterial endotoxin, usually reported through an LAL assay, and sterility then cover contamination that neither chromatographic method sees. Net content verification, where a vendor reports it, confirms the vial holds the milligram amount printed on the label, which is a genuinely useful line to see on a compound sold across such a wide range of presentations.
Then the caveat near the bottom. Most contract labs include language saying they didn’t select the sample and can’t confirm it represents the lot. That’s honest rather than evasive, and it means the vendor’s own sampling and release process carries part of the weight the certificate appears to carry alone.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the United States and carries out synthesis, vialing, lyophilization, labeling and quality control release in-house. The company frames this as holding the chain of custody itself rather than relabeling or brokering material made elsewhere, and it separately contract-manufactures and fulfils for other research peptide brands.
Every lot is released against a four-part panel: identity by mass spectrometry, purity by HPLC at a >99% threshold, bacterial endotoxin, and sterility. Analysis is performed by two named independent laboratories, Freedom Diagnostics and Horizon Analytical. Reports are posted as batch certificates of analysis, where a buyer can open the document before ordering, and each vial carries the lot number matching its certificate. Lyophilized material is dated for roughly 24 months from release.
Tesamorelin is listed in the catalog on its own and released against that same panel, with no allowance made for the fact that a 44-residue acylated chain is harder to bring in at a given purity than a short sequence. That fixed threshold is the reason a release standard is worth publishing at all. The catalog holds 34 compounds, including three blends itemised per component: 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 one business day, and orders ship at room temperature, which suits lyophilized peptide without cold-chain handling. The company has operated for five years and sells for research use only.
What four vendors publicly state about tesamorelin certificates
Taking the four in turn, quoting their pages as reviewed 2026-09-08.
Protide Health links certificates directly from its tesamorelin page for 10mg and 20mg presentations, including report 2608120515 tied to lot PH-te10-0616 and dated August 17, 2026, report 2608031051 dated August 7, 2026, report 2605150488 tied to lot PH-te20-0305 and dated May 18, 2026, and report 2605150485 dated the same day. The page states “99% Purity (HPLC-MS Verified)” with per-batch figures of 99.93%, 99.55%, 99.84% and 99.77%, and states the material is “Independent Third-Party Tested” by Freedom Diagnostics, “a third-party U.S. laboratory”. Methods listed are HPLC-UV for purity, LC-MS for identity, an LAL assay for endotoxin per USP <85>, and net content verification. That combination of a named lab, a report number, a lot and a date is the pattern this whole article is asking for, and it’s worth saying that Freedom Diagnostics is also one of the two laboratories Blank Peptides uses.
Swiss Chems states on its “Tesamorelin, 2mg” page that “Every batch is independently lab tested for identity, purity and potency”, offers a “View our lab testing program” link and a “View Lab Results” link, and states “Independently third-party HPLC-tested; COA available per batch.” The certificate documents themselves were not displayed on the product page reviewed, so reading one means following through to the separate results page. No laboratory was named in the page prose, and no endotoxin or heavy metals result was listed for this compound. The page states the product “is intended for research purposes only”.
Core Peptides lists “Tesamorelin – 5MG / 10MG” with Purity given as “>99%” and Form as “Lyophilized powder”. On that page as reviewed 2026-09-08, no certificate link, no certificate image, no laboratory name and no testing method was present, although the same site does link certificate PDFs from other product pages. The site describes itself as “a chemical supplier” rather than a compounding pharmacy or outsourcing facility.
Pure Rawz lists tesamorelin under the designation TH9507 with a price range of $59.99 to $139.99 and a statement that “Every batch is tested for purity”, alongside a 99.9% figure in the page metadata. No certificate link, image, date or lot appeared in the content reviewed, and no laboratory was named. The site separately states that it “does not sell or directly supply the products featured on this website”, which reframes what any documentation on that page would be describing. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Where these vendors do better than us: Protide Health keeps several dated certificates live per compound with distinct report numbers rather than replacing the previous one each release, and that archive depth is genuinely useful if you want to watch a supplier’s numbers hold across a year.
Side by side: tesamorelin certificate access and content
| Attribute | Blank Peptides | typical vendor |
|---|---|---|
| Synthesises in-house | Own cGMP lab; synthesis through QC release under one roof | States US manufacture, describes itself as a chemical supplier, or states it does not supply the products at all — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical, named in prose | States a named US laboratory on one of four pages reviewed; unnamed “independent” testing on the rest — verify |
| HPLC purity | >99% per lot | States 99%, >99% or 99.9%, sometimes with per-batch figures listed — verify |
| MS identity | Confirmed per lot by mass spectrometry | States LC-MS identity on one page reviewed; purity only on the others — verify |
| Endotoxin and sterility | Both tested and reported per lot | States an LAL endotoxin assay on one page; not listed on the others 2026-09-08 — verify |
| Batch COA before purchase | Public library at /coas/, lot-numbered, every lot, no account needed | States lot-tied dated certificates on one page; a separate results page or nothing on the others — verify |
| Lot number on vial and certificate | Present on both and matched | States lot identifiers on some certificates and omits them on others — verify |
| Certificate date shown | Dated per lot on the public library | States dated reports on one page reviewed; no visible date on the rest — verify |
| Net content verified | Fill checked at release | States net content verification on one page reviewed — verify |
How to verify either supplier yourself
- Open the certificate before anything goes in the cart, and copy out the lab name, report number, lot and date by hand so you still have them if the page changes later.
- Check the identity line specifically, because on a 44-residue acylated chain the closely related byproducts are the ones a purity percentage alone will not reveal to you.
- Phone or email the laboratory named on the report and ask them to confirm the report number, since a genuine contract lab will do that and a fabricated one has nobody to pick up.
- Compare the certificate’s stated vial content against the milligram figure on the listing, especially for a compound sold anywhere from 2mg to 20mg per vial.
- Match the vial’s lot number to your saved certificate when the package arrives, and run the whole sequence once through the supplier verification checklist.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Who Actually Manufactures Research Peptides in the USA?
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
What is a tesamorelin COA and what does it need to show?
It’s the analytical report for one specific lot of the peptide. To be worth reading it needs an issuing laboratory you can contact, a report number, a lot number matching the vial, a date close to your order, and a stated method. Purity by HPLC is the baseline, and identity, endotoxin and sterility fill in the rest of the picture.
Why does the identity result matter so much for tesamorelin?
Because the sequence is 44 residues long and carries an N-terminal acyl group, so a synthesis can fall short in ways that produce species very close to the target. Mass spectrometry reports the mass of what’s actually present. A purity percentage reports only how much of the sample was a single species, without saying which one.
Can a tesamorelin certificate be faked?
Templates and chromatogram images both reproduce easily, which is why the laboratory’s name is the load-bearing field on the document. A named lab can confirm or deny a report number over the phone. A certificate issued by an unnamed “independent lab” leaves you no route to check anything, however convincing the layout.
Should I trust a tesamorelin COA that’s several months old?
Age isn’t automatically disqualifying for a lyophilized peptide, but an older report describes an older lot. If the certificate predates your order by many months, ask the vendor which lot they’re shipping and whether a current report exists for it, then match the number on the vial against whatever they send you.
Are these products for human use?
No. Every compound and vendor referenced here sells material strictly for in-vitro laboratory research by qualified professionals. Blank Peptides sells for research use only, and each vendor page reviewed carries its own statement that products are not for human use. Nothing above should be read as guidance for use outside a laboratory.
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.
