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Buy GLP-3-R (Retatrutide Analog) in the USA

GLP-3-R is BioInfinity Lab's research-grade Retatrutide analog — a triple-agonist research peptide investigated in published clinical trials at GLP-1, GIP, and glucagon receptors. We supply ≥99% HPLC-verified GLP-3-R same-day from New York with a batch-specific COA.

Triple-receptor research analog (GLP-1 / GIP / glucagon)≥99% HPLC purity, third-party COASame-day USA shipping

Available sizes — GLP3-R

Choose a size to continue to the product page where you can add to cart and complete checkout.

GLP3-R
5 mg
$85
In stock
Buy 5 mg
GLP3-R
10 mg
$165
In stock
Buy 10 mg
GLP3-R
20 mg
$295
In stock
Buy 20 mg
GLP3-R
30 mg
$375
In stock
Buy 30 mg
Need full product specs, batch COA, or related products? View the full GLP3-R product page →

Why GLP-3-R is one of the most-watched research peptides of the decade

The 2023 NEJM publication describing the Phase 2 Retatrutide trial drew significant attention from the metabolic-research community for the triple-agonist mechanism's reported effects. GLP-3-R is BioInfinity Lab's research-grade analog of that compound, intended exclusively for laboratory research replicating or extending the cited literature.

How GLP-3-R differs from GLP-1-S and GLP-2-T research analogs

Published literature characterizes Semaglutide (our GLP-1-S) as a single-receptor (GLP-1) agonist, Tirzepatide (our GLP-2-T) as a dual (GLP-1 + GIP) agonist, and Retatrutide (our GLP-3-R) as a triple (GLP-1 + GIP + glucagon) agonist. Research suggests the additional glucagon-receptor activity may produce differentiated metabolic effects compared with the single- and dual-agonist analogs.

Vial sizes for research protocols

Available in lyophilized 5 mg and 10 mg vials. Research protocols cited in the NEJM Phase 2 publication used weekly subcutaneous administration of 1–12 mg in trial cohorts — researchers should reference the cited literature and follow IRB-approved protocols.

Storage, reconstitution, and shipping

Lyophilized vials store at −20 °C. Reconstituted solution refrigerates at 2–8 °C and is typically used within 28 days. All orders ship same-day from our New York facility with free shipping over $200.

Research FAQ — GLP3-R

Frequently asked questions about this compound for laboratory researchers.

What is Retatrutide / GLP-3-R?+
Retatrutide is an investigational triple-agonist research peptide that interacts with GLP-1, GIP, and glucagon receptors. Published Phase 2 trial data describe metabolic and body-composition effects under controlled clinical-research conditions.
Cited: PMID 37314979, PMID 38866447
How does Retatrutide differ from Semaglutide and Tirzepatide?+
Research literature characterizes Semaglutide as a single (GLP-1) agonist, Tirzepatide as a dual (GLP-1 + GIP) agonist, and Retatrutide as a triple (GLP-1 + GIP + glucagon) agonist. Published data on the additional glucagon-receptor activity suggest differentiated metabolic effects in clinical-research populations.
Cited: PMID 37314979
What dosing has been reported in Retatrutide clinical research?+
Phase 2 publications describe weekly subcutaneous administration of 1–12 mg in trial cohorts. Researchers should reference the cited NEJM publication and their IRB-approved protocols.
Cited: PMID 37314979
How is Retatrutide stored?+
Lyophilized Retatrutide should be stored at −20 °C protected from light. Reconstituted solution is typically held at 2–8 °C and used within 28 days. Refer to the product COA and your laboratory's SOP.

Published research references

Peer-reviewed literature relevant to GLP3-R research. Linked PubMed IDs open the original source.

  1. [1]Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial — N Engl J Med (2023) · PMID 37314979
  2. [2]Retatrutide: pharmacology, clinical trials, and mechanism of action — Diabetes Obes Metab (2024) · PMID 38866447
  3. [3]Retatrutide for type 2 diabetes: Phase 2 trial outcomes — Lancet (2023) · PMID 37322535
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Reviewed by the BioInfinity Research Team
Content reviewed by our research and quality team — biochemistry-degreed reviewers working alongside our analytical lab partner (Janoshik Analytical). Every product page is cross-checked against the cited peer-reviewed literature and the current batch's third-party COA.
For laboratory research use only. Not for human or veterinary use. Content is informational and does not constitute medical advice.

Verified reviews — GLP3-R

1 verified buyer

★★★★★
5.0 / 5
daviddanyal15Verified buyer
Jun 8, 2026
★★★★★
Excellent

Very pure, mixed nice and clear, super fast shipping.

Reviews are submitted by verified buyers via per-order tokenized links. Reviews are evaluated for product-focused content; any review containing therapeutic claims (cured, treats, healed, etc.) may be edited or hidden to maintain compliance with FDA and platform guidelines.

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Same-day shipping from New York, ≥99% HPLC-verified purity, and a third-party COA on every lot.

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For laboratory research use only. Not for human or veterinary use.