Retatrutide Research FAQ: Purity, COA & Storage

Retatrutide is a triple-agonist research peptide targeting GLP-1, GIP, and glucagon receptors simultaneously. Developed by Eli Lilly as LY-3437943, it is currently in Phase 3 clinical trials. It represents the most advanced multi-receptor metabolic compound in its class. For current regulatory progress, see our retatrutide approval status guide.

Each archived Retatrutide batch was independently analysed by Janoshik Analytical via HPLC: 30mg pen RETP002 at 99.262%, 20mg pen RET-20-C-2604-001 at 99.841%, 10mg vial RET-20-V-2604-001 at 99.741% and 40mg vial RT-40-V-001 at 99.692% sterility-tested. Those records stay published in the COA library; our Peptide COA Guide explains how to read HPLC purity, assay, endotoxin, TFA, and heavy-metals fields.

The retatrutide pen format documented in these records is a prefilled pen containing 30mg of stabilized, pH-balanced solution. No reconstitution is required. Each click delivers 0.1mg, with 300 total clicks per pen. See the Retatrutide Pen Guide for the full click map and format details.

When stored at 2–8°C, the stabilized solution maintains potency for up to 12 months from the date of manufacture. Always check the expiry date recorded on the batch Certificate of Analysis.

Each click of the pen mechanism delivers 0.1mg of Retatrutide (10 clicks per mg). The pen contains 300 total clicks (30mg) with a full dial range of 60 clicks (6mg). This eliminates reconstitution variables and ensures repeatable output across research protocols. For exact dose math, use the Retatrutide Dosage Calculator or review the dosage guide.

Each click delivers 0.1mg (10 clicks = 1mg), so 1mg = 10 clicks, 2mg = 20 clicks, and 2.5mg = 25 clicks. The same click math applies across the 10mg, 20mg, 30mg, and 40mg pens — only the total capacity per pen differs. For any target amount, the Retatrutide dosage calculator converts mg to clicks instantly, and the dosage guide shows the full click map.

Store between 2–8°C (standard refrigerator temperature). Do not freeze. Protect from light. Our Peptide Stability & Storage Guide covers broader handling notes for research peptides and prefilled formats.

Yes — a lyophilized (freeze-dried) vial has to be reconstituted before use in vitro, and bacteriostatic water is the diluent most laboratory protocols specify. Prefilled pens arrive in solution and need no reconstitution. See our bacteriostatic water guide for protocol details and the reconstitution calculator for the mixing math.

Research peptides may be legally held and used for in-vitro laboratory research purposes in the UAE. Per UAE MoHAP Circular 17/2022, peptides may not be marketed for therapeutic use without registration. Everything Remy Peptides publishes is written strictly for laboratory research reference. For the wider picture, see our global peptide-legality overview (US, UK, EU, AU) or the UAE-specific compliance brief.

No. Retatrutide is currently an investigational compound in Phase 3 clinical trials conducted by Eli Lilly. It is not approved for human or veterinary use in any jurisdiction. It is covered here exclusively in an in-vitro laboratory research context.

Qualified research professionals aged 21 and over. Every page assumes an in-vitro laboratory research context and none of it is written for human or veterinary diagnosis or treatment.

Every batch-specific Janoshik Analytical Certificate of Analysis we have ever cited stays published in the COA library, with the full analytical panels mirrored in the lab results archive. They are kept online as archived third-party records so any purity figure quoted in our research articles remains checkable against its source document.

Retatrutide is a triple-agonist (GLP-1 + GIP + GCGR) while Semaglutide targets only GLP-1. The additional glucagon receptor activation in Retatrutide increases energy expenditure, a mechanism absent from single-agonist therapies. Preclinical data shows ~20–24% body weight change vs ~15% for Semaglutide. See our detailed comparison.

Retatrutide (LY-3437943) is a triple agonist — GLP-1, GIP, and glucagon (GCGR) — while Tirzepatide (LY-3298176) is a dual agonist targeting only GLP-1 and GIP, with no glucagon-receptor activity. That added glucagon arm is what sets Retatrutide’s energy-expenditure mechanism apart in research. New to these receptor terms? The peptide research glossary defines agonist, GLP-1, GIP, and GCGR. See the full comparison guide for the head-to-head data.

• GLP-1 (Glucagon-Like Peptide-1): appetite suppression, insulin secretion.
• GIP (Glucose-Dependent Insulinotropic Polypeptide): additive insulin enhancement.
• GCGR (Glucagon Receptor): energy expenditure and thermogenesis.

The investigational pharmaceutical compound LY-3437943 is developed by Eli Lilly for clinical trials. The research-grade batches documented in our COA library were analysed independently by Janoshik Analytical, a third-party laboratory unaffiliated with Eli Lilly.

Each archived Retatrutide batch underwent independent HPLC purity analysis by Janoshik Analytical, a laboratory specializing in pharmaceutical-grade compound verification. Recorded results: 30mg pen RETP002 99.262%, 20mg pen RET-20-C-2604-001 99.841%, 10mg vial RET-20-V-2604-001 99.741%, 40mg vial RT-40-V-001 99.692% sterility-tested. The certificates and their full analytical panels remain published in the COA library.

GHK-Cu is a naturally occurring copper-binding tripeptide (glycyl-L-histidyl-L-lysine bound to copper — Gly-His-Lys + Cu), commonly known simply as the “copper peptide.” In laboratory work it is typically handled as a 50mg lyophilized research vial. Full write-up: GHK-Cu copper peptide research.

In published research, GHK-Cu is investigated for its roles in copper transport, extracellular-matrix signalling, and tissue-remodelling pathways. All such work is in-vitro or preclinical — we cover GHK-Cu strictly as laboratory research and make no human-use or therapeutic claims.

GHK-Cu is normally supplied to laboratories as a 50mg lyophilized vial and reconstituted with bacteriostatic water. Reconstitute to the concentration your protocol requires — the reconstitution calculator and the bacteriostatic water guide cover the mixing math.

BPC-157 (“Body Protection Compound 157”) is a synthetic pentadecapeptide — a stable 15-amino-acid sequence derived from a protein found in gastric juice. In laboratory work it is typically handled as a 10mg lyophilized research vial. Full write-up: BPC-157 research review.

BPC-157 is normally supplied to laboratories as a 10mg lyophilized vial and reconstituted with bacteriostatic water. Reconstitute to your protocol’s concentration using the reconstitution calculator and the bacteriostatic water guide.

TB-500 is a synthetic fragment of Thymosin Beta-4 (Tβ4), a naturally occurring actin-binding peptide. In laboratory work it is typically handled as a 10mg lyophilized research vial. Full write-up: TB-500 / thymosin beta-4 research.

TB-500 is normally supplied to laboratories as a 10mg lyophilized vial and reconstituted with bacteriostatic water. Use the reconstitution calculator and the bacteriostatic water guide for the mixing math.

The blend is a single lyophilized vial containing 5mg BPC-157 + 5mg TB-500 (10mg total) — the two compounds researchers most often study together. Full write-up: BPC-157 + TB-500 blend mechanism and synergy.

The blend is normally supplied as a 10mg combined vial and reconstituted with bacteriostatic water; both components go into solution together. See the bacteriostatic water guide and the reconstitution calculator.

KPV is a tripeptide (Lysine-Proline-Valine) — the C-terminal fragment of α-MSH. In laboratory work it is typically handled as a 10mg lyophilized research vial. Full write-up: KPV peptide research.

KPV is normally supplied to laboratories as a 10mg lyophilized vial and reconstituted with bacteriostatic water. Lyophilized KPV stored at 2–8°C stays within published shelf parameters; reconstitute with the reconstitution calculator and the bacteriostatic water guide.

Tesamorelin is a synthetic GHRH analog (growth-hormone-releasing hormone). In laboratory work it is typically handled as a 10mg lyophilized research vial. Full write-up: Tesamorelin GHRH analog research.

Tesamorelin is normally supplied to laboratories as a 10mg lyophilized vial and reconstituted with bacteriostatic water. Use the reconstitution calculator and the bacteriostatic water guide for the mixing math.

MOTS-c is a mitochondrial-derived peptide — a 16-residue peptide encoded in mitochondrial DNA. In laboratory work it is typically handled as a 10mg lyophilized research vial. Full write-up: MOTS-c mitochondrial peptide research.

MOTS-c is normally supplied to laboratories as a 10mg lyophilized vial and reconstituted with bacteriostatic water; use the reconstitution calculator and bacteriostatic water guide for laboratory planning.