Retatrutide Research Peptide (GLP3-R)
Lyophilized Format • ≥99% HPLC Purity • COA Available • Ships in 1–2 Business Days • U.S. Warehouses
Retatrutide (GLP3-R), also designated LY3437943, is a synthetic triple-receptor agonist research peptide and research chemical supplied by Nextday Peptides for laboratory and analytical applications. Laboratories order retatrutide as a lyophilized GLP-3 reference compound with batch documentation suitable for in-vitro and analytical workflows. Each retatrutide vial is independently verified to ≥99% HPLC purity with a Certificate of Analysis available on request. For scientific research use only — not for human or veterinary consumption. See our Research Use Only policy.
GLP-3 Retatrutide Research Compound — Laboratory Supply
Nextday Peptides supplies GLP3-R retatrutide for qualified research buyers who need a documented triple-agonist reference standard. Whether your protocol requires a retatrutide research peptide for receptor pharmacology or a retatrutide research chemical for analytical verification, this SKU is labeled for retatrutide lab use only under RUO terms. U.S. fulfillment supports laboratories that need to order retatrutide with traceable lot data and COA-backed purity claims — not clinical or compounding applications.
Compound Specifications
| Compound Name | Retatrutide / GLP3-R / LY3437943 |
| Receptor Targets | GLP-1R, GIPR, GCGR (Triple Agonist) |
| Molecular Weight | 4,731.33 g/mol (free base) |
| Molecular Formula | C₁₉₁H₂₉₁N₄₅O₅₈ |
| Form | Lyophilized powder |
| Appearance | White to off-white powder |
| Purity | ≥99% (HPLC verified) |
| Storage | -20°C lyophilized; 2–8°C after reconstitution |
| CAS Number | 2381089-83-2 |
| SKU | NDP-056 |
Certificate of Analysis & HPLC Purity Verification
Every lot is tested for ≥99% HPLC purity. Retatrutide COA documentation is available through our COA Library. For guidance on interpreting purity reports, see how to read a Certificate of Analysis for research peptides.
Mechanism of Action
Retatrutide simultaneously activates three metabolic receptors, distinguishing it from dual agonists such as tirzepatide (GLP-1/GIP only) and single agonists such as semaglutide (GLP-1 only). This triple receptor profile makes it a uniquely valuable reference compound for multi-pathway incretin biology research.
- GLP-1 receptor activation — stimulates glucose-dependent insulin secretion, suppresses glucagon release, and slows gastric emptying in research models
- GIP receptor activation — potentiates insulin secretion and modulates adipose tissue metabolism in preclinical studies
- Glucagon receptor partial agonism — supports hepatic glucose output modulation and increased energy expenditure at physiological concentrations in research models
The simultaneous engagement of all three receptors produces coordinated effects on insulin secretion, glucagon suppression, energy expenditure, and metabolic signaling studied in preclinical models and referenced in peer-reviewed literature.
Research Applications
Retatrutide is studied across several active research domains:
- GLP-1/GIP/glucagon receptor crosstalk and downstream signaling pathway studies
- Comparative receptor pharmacology alongside semaglutide and tirzepatide reference compounds
- Metabolic parameter modeling in preclinical rodent and in-vitro models
- Appetite regulation and energy homeostasis investigations
- Insulin secretion, beta cell function, and glucose metabolism research
- Body composition studies examining lean mass and adipose tissue distribution
- Multi-receptor agonist binding affinity and selectivity profiling
Why Research Laboratories Select GLP3-R
Retatrutide is one of the most studied triple-receptor agonist peptides in current metabolic research. Its simultaneous engagement of GLP-1, GIP, and glucagon receptors makes it a valuable reference compound for laboratories investigating multi-pathway receptor biology, energy homeostasis models, and metabolic signaling in preclinical settings.
- Triple receptor profile — GLP-1R, GIPR, and GCGR simultaneous engagement in research models
- Referenced in peer-reviewed literature on triple incretin receptor pharmacology
- Useful for comparative studies alongside single and dual agonist reference compounds
- Lyophilized format ensures stability and reproducibility across experimental runs
- Batch and lot identifiers on all labeling for full laboratory documentation compliance
Research Background
GLP3-R (Retatrutide) has been referenced in scientific literature as a GLP-1/GIP/glucagon receptor triple agonist. Preclinical studies in rodent and non-human primate models have examined its effects on metabolic parameters. Published human pharmacology studies are cited in the research literature. All information here is for educational and reference purposes only and does not constitute medical or clinical guidance.
Reference sources: PubChem — Retatrutide | Nature — Structural Basis of Triple Agonism
Retatrutide vs. Tirzepatide vs. Semaglutide: Research Comparison
| Compound | Receptor Targets | Agonist Type |
| Retatrutide (GLP3-R) | GLP-1R, GIPR, GCGR | Triple agonist |
| Tirzepatide (GLP2-T) | GLP-1R, GIPR | Dual agonist |
| Semaglutide (GLP1-S) | GLP-1R | Single agonist |
This comparison table is provided for research reference only. All compounds listed are supplied for laboratory research use only and are not intended for human use.
Shipping & Fulfillment
- Ships from U.S. warehouses — Florida, North Carolina, and California
- Overnight and 2-day shipping available at checkout
- Same-day processing on orders placed before cutoff
- Discreet packaging with full tracking provided
- Bulk research orders welcome — contact us for volume pricing
Storage & Handling
- Store lyophilized peptide at -20°C away from light and moisture
- After reconstitution, store at 2–8°C and use promptly
- Avoid repeated freeze-thaw cycles to maintain integrity
- Handle using appropriate laboratory safety protocols
- Keep containers sealed when not in use
Reta Peptide & GLP-3 Nomenclature for Researchers
In laboratory catalogs and procurement searches, retatrutide is frequently referenced as reta peptide, GLP-3 retatrutide, GLP3-R, or by its development designation LY3437943. These terms describe the same synthetic triple-receptor agonist research compound supplied in lyophilized form for qualified buyers. When sourcing reference material for receptor pharmacology or analytical verification workflows, confirm CAS 2381089-83-2, lot identifiers, and COA-backed purity data rather than informal naming alone. Nextday Peptides lists this SKU as Retatrutide Research Peptide (GLP3-R) for traceable laboratory supply under research use only terms.
Frequently Asked Questions — Laboratory Use
What is Retatrutide GLP3-R?
Retatrutide (LY3437943) is a synthetic peptide triple agonist that simultaneously targets GLP-1, GIP, and glucagon receptors. It is supplied strictly for scientific, analytical, and in-vitro laboratory research use only.
Is a Certificate of Analysis (COA) included?
Yes. Retatrutide COA documentation is available per batch through our COA Library. Purity is verified by HPLC at ≥99% for laboratory research applications.
How does retatrutide differ from tirzepatide and semaglutide?
Retatrutide is a triple agonist targeting GLP-1, GIP, and glucagon receptors. Tirzepatide targets GLP-1 and GIP only (dual agonist). Semaglutide targets GLP-1 only (single agonist). The additional glucagon receptor engagement in retatrutide produces distinct metabolic effects studied in research models.
Is this compound intended for human or clinical use?
No. This retatrutide research peptide is for laboratory research use only. It is not approved for human or veterinary use and is not intended for diagnostic, therapeutic, or clinical applications. Read our Research Use Only policy.
How fast does Nextday Peptides ship?
We ship from U.S. warehouses in Florida, North Carolina, and California. Overnight and 2-day shipping options are available. Most orders process same day.
Are bulk research orders available?
Yes. We accommodate bulk laboratory orders. Contact us directly for volume pricing and availability.
What other GLP research compounds does Nextday Peptides carry?
We stock Semaglutide GLP1-S, Tirzepatide GLP2-T, BPC-157, and TB-500. View our full research compounds catalog.
Where can laboratories buy GLP-3 retatrutide for research online in the USA?
Qualified research buyers can order GLP-3 retatrutide directly from this product page through Nextday Peptides. U.S. fulfillment ships from Florida, North Carolina, and California with overnight and 2-day options at checkout. Each lot includes batch documentation with ≥99% HPLC purity verification and COA access through our COA Library. This retatrutide research peptide is supplied strictly for laboratory and analytical research — not for human or veterinary use.
Is reta peptide the same as retatrutide (GLP-3)?
Yes. In research procurement and literature, reta peptide commonly refers to retatrutide, the GLP-1/GIP/glucagon triple-agonist also designated GLP3-R or LY3437943. The compound supplied here is the same lyophilized research chemical described in the Compound Specifications table. All naming variants refer to laboratory reference material for in-vitro and preclinical research applications only.
What is a retatrutide research chemical used for in the lab?
As a retatrutide research chemical, this compound serves as a documented triple-receptor agonist reference standard for GLP-1R, GIPR, and GCGR pathway studies. Typical laboratory applications include receptor binding assays, comparative pharmacology alongside dual and single agonist compounds, metabolic signaling models, and analytical method development. It is not approved for clinical, diagnostic, or therapeutic use. Review our Research Use Only policy before ordering.
What are reta peptide benefits in laboratory research?
In preclinical and in-vitro models, reta peptide (retatrutide, GLP3-R) is studied as a triple-receptor agonist reference compound targeting GLP-1R, GIPR, and GCGR. Documented research endpoints include receptor binding and selectivity profiling, comparative pharmacology alongside single- and dual-agonist compounds, metabolic signaling pathway analysis, insulin secretion and glucose metabolism assays, and energy homeostasis modeling. These are laboratory research applications only — not clinical, diagnostic, or therapeutic outcomes. Review our Research Use Only policy before ordering.
How do qualified buyers purchase retatrutide peptide for research?
Qualified laboratory buyers can buy retatrutide peptide directly from this product page through Nextday Peptides. Select your quantity, complete checkout, and choose U.S. fulfillment with overnight or 2-day shipping options. Each lot ships with batch identifiers, ≥99% HPLC purity verification, and COA access through our COA Library. This SKU is supplied strictly for laboratory and analytical research — not for human or veterinary use.
For Research Use Only — Not for human or veterinary consumption • Not evaluated by the FDA • Supplied by Nextday Peptides for laboratory research applications only • Research Use Only policy
