A retatrutide COA should name retatrutide itself, not only a code name, and report purity and measured content for the lot and size you buy. Clean Peptide sells retatrutide as GLP-3 Reta (also listed as GLP-3 R) and publishes an ILS Laboratories certificate for each size on sale. The 10 mg lot (ACE-4798089) measured 10.72 mg, the 20 mg lot (ACE-2753055) 21.37 mg and the 30 mg lot (ACE-3310727) 32.2 mg, all at 99.90% HPLC purity, with retatrutide identity confirmed and fentanyl, heavy-metal, sterility and endotoxin results on every certificate.
This page reads the three certificates line by line. What the GLP code names mean is covered in GLP-1 vs GLP-2 vs GLP-3, and the molecule itself in what is retatrutide; neither is repeated here.
The three retatrutide certificates, side by side
| 10 mg | 20 mg | 30 mg | |
|---|---|---|---|
| Lot | ACE-4798089 | ACE-2753055 | ACE-3310727 |
| ILS certificate | COA-2026-PPS8GB | COA-2026-V4X4IZ | COA-2026-ATKEJB |
| Received / analysed | 27 August 2026 / 3 September 2026 | ||
| Identity (HPLC retention time) | Retatrutide: confirmed on all three | ||
| HPLC purity | 99.90% | 99.90% | 99.90% |
| Net peptide content | 10.72 mg | 21.37 mg | 32.2 mg |
| Content as % of label | 107.2% | 106.9% | 107.3% |
| Fentanyl screen | Not detected on all three | ||
| Heavy metals (ICP-MS) | As, Cd, Pb, Hg, Cr: not detected on all three | ||
| Sterility (PCR) | No growth on all three | ||
| Endotoxin (USP <85>) | 0.101 EU/mL on all three (reported) | ||
| Overall | Pass | ||
Transcribed in October 2026 from the three ILS Laboratories certificates. Percentages of label are simple arithmetic on the certificate’s figures.
Line by line: what each result means
Identity
ILS identifies retatrutide by HPLC retention time: the sample’s main peak is compared with a retatrutide reference standard run on the same method. Each certificate is titled with the molecule (“Retatrutide – 10mg” and so on), while the vial photo on the certificate shows our label, “GLP-3 R”. That pairing is what you want to see: the code name on the vial, the molecule on the certificate. A certificate that only repeats a code name does not tell you what the laboratory found.
Retention-time identity is not mass spectrometry. These certificates do not report a measured molecular mass; retatrutide’s is 4,731.34 g/mol (C221H342N46O68, CAS 2381089-83-2). Our guide to peptide testing compares the two methods.
HPLC purity: why all three read 99.90%
HPLC purity is the share of the main peak among the peptide-related peaks at 214 nm. ILS’s portal notes state that purity values are capped at 99.9% to reflect the instrument’s limit of detection. So three lots at 99.90% means all three are at or above the cap, not that they are identical to the last decimal.
Net peptide content
Content is a separate measurement: the milligrams of peptide in the vial. All three vials measured between 106.9% and 107.3% of their label. A purity figure alone cannot tell you this; a vial can be pure and under-filled.
Safety screens
The fentanyl immunoassay (50 ng/mL cutoff), the ICP-MS heavy-metals panel and the PCR sterility test are pass or fail. Endotoxin is reported as a value, 0.101 EU/mL, without a pass or fail limit, which ILS explains is because acceptable limits depend on the product and matrix.
What to check on any retatrutide certificate
- The identity line names retatrutide and the method, not only “GLP-3”, “GLP-3 R” or “Reta”.
- The lot and size match the vial. Each size here is its own lot with its own certificate.
- Both purity and measured content are reported, in % and in mg.
- The panel is stated: contaminant screen, heavy metals, sterility and endotoxin, or a note that they were not tested.
- The dates make sense: received, analysed and issued, for a lot that is on sale now.
- It can be checked with the laboratory. Each of our lot pages links to ILS’s own record; the 10 mg certificate’s access code is 7CEXRU9X. See how to verify a peptide COA.
The retatrutide certificates on file today
This table is read from the same certificate records as the product page, so it changes when a new lot goes on sale. Every lot is also listed on the GLP-3 Reta COA page.
| Size | Lot | Laboratory | Analysed | HPLC purity | Measured content | Identity |
|---|---|---|---|---|---|---|
| 10mg | ILS Laboratories | 3 Sep 2026 | 99.90% | 10.72mg | Confirmed | |
| 20mg | ILS Laboratories | 3 Sep 2026 | 99.90% | 21.37mg | Retatrutide | |
| 30mg | ILS Laboratories | 3 Sep 2026 | 99.90% | 32.2mg | Retatrutide |
Transcribed from the certificate issued for each size on sale today. The certificate names the material as GLP-3 R / Retatrutide. Open the GLP-3 Reta certificates Every GLP-3 Reta COA, lot by lot
Where to buy retatrutide in the US with a third-party COA
Clean Peptide is a US store, cleanpeptide.com, operated by Helios LLC in Winston-Salem, North Carolina (about us). It sells retatrutide as GLP-3 Reta for laboratory research only, and publishes the ILS Laboratories certificate for each lot on the product page and in the COA library. For related research material, see retatrutide vs tirzepatide and retatrutide vs semaglutide.
