Every lot of Tesamorelin is tested by ILS Laboratories, an independent laboratory, for purity, identity and net content before release. Endotoxin and microbial results are added where those tests are run. Here is what each test measures, how results are reviewed, and how to check them yourself.
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No single method answers every question about a peptide sample. Tesamorelin is tested with complementary methods so that each one covers what the others can't.
Reversed-phase high-performance liquid chromatography separates the sample's components by hydrophobicity, and a UV detector records each as a peak. Purity is the main peak's area as a percentage of all detected peak area.
Limits: does not identify the peak, and impurities that co-elute or absorb weakly in UV can be under-counted. More on HPLC
The laboratory runs the sample and a reference standard of Tesamorelin under the same chromatographic conditions. Identity is reported as confirmed when the sample’s main peak elutes at the reference standard’s retention time.
Limits: a retention-time match is consistent with the named compound but is not a mass or structure measurement; compounds with similar retention can co-elute. More on HPLC
The laboratory screens each lot by immunoassay at the cutoff printed on the certificate. Current lots are reported as not detected.
Limits: a negative result means below the cutoff for the sample tested; an immunoassay screens for its target only.
The laboratory quantifies the main compound in the tested vial against a standard. It is reported in milligrams next to the labeled vial size.
Limits: measured on the vial tested; other vials from the same lot are expected to be similar but are not individually measured.
The path every lot follows from production to a published certificate.
Tesamorelin Labs’ stated release specification is ≥95% HPLC-UV purity with identity confirmed by HPLC retention-time match against a reference standard. Current lots test at 99.54%, well above the ≥95% release specification.
Each lot carries a unique lot number (for example KB-77284) printed on every vial label and on the certificate. The laboratory also assigns its own reference numbers (certificate number, accession number where issued, and a verification access code), which are listed on each lot page for cross-checking.
Certificates remain published in the archive after a lot sells through, so the documentation for any vial stays available.
ILS Laboratories is an independent, U.S.-based analytical testing laboratory. Its certificates for Tesamorelin are signed by the laboratory's principal chemist and carry a QR code linking to the laboratory's own record.
Laboratory contact: freedomdiagnosticstesting.com, .
| Lot | Vial size | Net content | Purity (HPLC-UV) | Identity (HPLC-RTM) | Endotoxin (LAL) | Microbial (PCR) | Reported | COA |
|---|---|---|---|---|---|---|---|---|
| KB-77284 | 10 mg | 10.45 mg | 99.54% | Confirmed | Not tested | Not tested | View lot KB-77284 |
Testing laboratory: ILS Laboratories. Release specification: purity ≥95% by HPLC-UV with identity confirmed by HPLC retention-time match against a reference standard. Results apply only to the lot listed. Certificates list the testing client as Klow.bio / Klow Labs LLC, the company that operates Tesamorelin Labs.
| Ion | Calculation | Expected m/z | Observed on COAs |
|---|
Expected values are calculated by Tesamorelin Labs from the average molecular weight (5135.86 g/mol; H+ 1.0073, Na+ 22.99, K+ 39.10). Observed values are as printed on each lot's mass confirmation panel.
Tesamorelin is analyzed with complementary methods: HPLC-UV for purity, HPLC-RTM for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at tesamorelin.bio/coa/.
Every lot is tested by ILS Laboratories, an independent third-party analytical laboratory. Tesamorelin Labs does not test its own material for published certificates.
Current lots report HPLC-UV purity 99.54%, against a stated release specification of ≥95%. The most recent result is 99.54% for lot KB-77284.
By HPLC retention-time comparison with a reference standard (HPLC-RTM), performed by ILS Laboratories on every lot. The laboratory runs the sample and a reference standard of the named compound under the same HPLC conditions; identity is confirmed when the main peak elutes at the reference standard’s retention time.
Endotoxin and microbial testing are reported per lot. Every lot page in the COA archive states whether those tests were performed.
HPLC (high-performance liquid chromatography) separates a sample's components so each appears as a peak. The purity percentage is the main peak's share of all UV-detected peak area. It does not confirm identity (the separate HPLC-RTM test does) or measure the amount of peptide in the vial (net content does).
A Tesamorelin certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. Tesamorelin Labs publishes every lot's COA as a readable page at tesamorelin.bio/coa/.
Find the lot number printed on your vial label and enter it at tesamorelin.bio/verify/, or open that lot in the COA archive at tesamorelin.bio/coa/.
Go to portal.ils-lab.com (or scan the QR code on the certificate) and enter the lot's verification access code, listed on its lot page, to view the laboratory's own copy of the certificate.
Net content is the laboratory's measurement of peptide in the tested vial. Current lots measured 10.45 mg in a 10 mg vial.
10 mg vials. Current lot KB-77284 tested at 99.54% purity with identity confirmed by HPLC retention-time match against a reference standard. Current purchasing is available through Klow.bio.