Three Janoshik-tested retatrutide batches cover the four shipping formats: RETP002 for the 30mg pen at 99.262% HPLC, RET-20-C-2604-001 for the 20mg pen at 99.841%, and RET-20-V-2604-001 for the vial line at 99.741% (plus heavy metals, residual TFA, and bacterial endotoxin on the vials). Per-format summaries below; raw PDFs live at /coa/.
Published Batches
- Highest purity
- 99.841% HPLC — 20mg Pen, batch
RET-20-C-2604-001 - Tested batches
- 3 batches covering 4 formats
- Testing lab
- Janoshik Analytical — EU, independent
- Panels published
- HPLC purity, assay, residual TFA, heavy metals (As, Cd, Pb, Hg), bacterial endotoxin (LAL)
- Newest report
- 23 April 2026 —
RET-20-C-2604-001
Per-Format Reports
The Retatrutide 10mg Pen ships under a per-order COA model — see the product page at Retatrutide 10mg Pen for current batch information. It has no fixed lab-results page yet because no batch has been published to the public archive.
Methodology
Why Janoshik. Every published Remy Peptides batch is sent to Janoshik Analytical, an independent third-party peptide testing lab based in the EU. Janoshik is the lab most frequently cited by research-peptide suppliers because every certificate carries a task number and verification key that lets any third party cross-check the report against the Janoshik server. Remy does not host or edit the reports — the PDFs and images are reproduced exactly as Janoshik issued them.
What HPLC measures, and doesn't. Reverse-phase HPLC on a C18 column separates the target peptide from peptide-related impurities (truncated sequences, deletion variants, synthesis byproducts) and reports the parent peak as a percentage of total peptide area. It only sees peptide content — not water, salts, residual solvents, or endotoxin. So a 99.7% number means 99.7% of the peptide material is the right molecule; it tells you nothing about sterility or dry-fill. That's why the vials get the extra panels.
Why endotoxin, TFA, and heavy metals on the vial line. Pens ship pre-formulated and pH-balanced, so HPLC purity of the dissolved peptide is the panel that matters. Vials ship as a freeze-dried solid that you reconstitute yourself, so we add three more: residual TFA (carryover from solid-phase synthesis that can skew cell-based assays), heavy metals via ICP-MS (As, Cd, Pb, Hg), and bacterial endotoxin via LAL (lipopolysaccharide fragments that can survive fill steps and confound immune-signalling readouts). Every vial batch gets all four. The HPLC purity guide goes deeper on what each number actually means.
Frequently Asked
How often does Remy publish new lab results?
RETP002 was tested 4 Nov 2025; the RET-20-C and RET-20-V batches were tested 21–24 Apr 2026 ahead of the spring release.
Where can I find the raw Janoshik PDFs?
/coa/<batch-id>/, one directory per batch. /coa/retp002/ for the 30mg pen, /coa/ret-20-c-2604-001/ for the 20mg pen, /coa/ret-20-v-2604-001/ for the vial line. The /coa/ index lists every published batch.
Why does the vial line carry additional panels?
What is the highest published Remy Retatrutide batch?
RET-20-C-2604-001 at 99.841% HPLC — the 20mg Pen lot tested 23 Apr 2026. Full report: /lab-results/retatrutide-20mg-pen/. Raw COA: /coa/ret-20-c-2604-001/. Every other batch sits within 0.6 pp — normal batch-to-batch variation for synthetic peptides.