$80.00–$150.00Price range: $80.00 through $150.00Save 11%
In Stock≥ 99% purity10 / 20mgLyophilized
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3+5% off$76.00 each
5+8% off$73.60 each
10+12% off$70.40 each
Paying by Zelle takes a further 5% off the order. At 10 or more that is $66.88 each.
The discount counts this product only, and applies automatically at checkout. Quantities of different products are counted separately.
For research use only. Not for human or animal consumption. Not evaluated by the FDA.
Common questions
Yes. Reta is the common shorthand for retatrutide, and you will also see it written as GLP-3 or GLP3. They all refer to the same compound, LY3437943 (CAS 2381089-83-2), the triple-receptor agonist listed on this page.
"GLP-3" is an informal nickname rather than a formal classification. Retatrutide acts on three receptors — GLP-1, GIP and glucagon — where tirzepatide acts on two, so the research community started calling it the next step along from GLP-1. The compound's actual designation is LY3437943.
Tirzepatide is a dual GIP/GLP-1 receptor agonist. Retatrutide adds glucagon-receptor activity to those two. We keep a side-by-side write-up of what the published research examined for each in our tirzepatide vs retatrutide comparison.
Both vials contain the same compound and differ only in the quantity of lyophilized powder. The 20mg vial is the lower cost per milligram. A Certificate of Analysis is published for the 10mg lot currently in stock, and the purity figure shown beside the price is that lot’s. The 20mg vial is shipping from a newer batch that has not yet been through third-party testing, so no certificate is published for it and it is supplied against the same stated purity specification as the rest of the catalogue.
Credit and debit card, Apple Pay, Google Pay, Zelle and Cash App. Choosing the card option places the order first, then gives you a secure payment link on your order confirmation and in your order email; that link also accepts Apple Pay and Google Pay. Zelle orders receive a 5% discount, applied automatically at checkout.
Orders placed before 12:00 PM ET on a business day are dispatched the same day, Monday through Saturday. Standard US shipping is a $15 flat rate and orders over $200 ship free. Inside San Antonio we also deliver to your door in the evening, or you can meet us and collect free of charge.
Lyophilized powder keeps at −20 °C for long-term storage or 2–8 °C short-term. Once reconstituted with bacteriostatic water, refrigerate at 2–8 °C and keep it out of light. Our reconstitution guide covers the full process.
Retatrutide is a synthetic 39–amino acid peptide studied in metabolic research as a triple agonist of the GIP, GLP-1, and glucagon receptors. It has become a frequent subject of preclinical and laboratory investigation into receptor-signaling and energy-metabolism pathways. Lumen Research supplies Retatrutide as a high-purity lyophilized powder intended exclusively for in-vitro research and laboratory study.
About Retatrutide
Retatrutide (also referenced in research as GLP-3 or LY3437943) is engineered to interact simultaneously with three incretin and metabolic receptors, making it a notable tool compound in laboratory studies of multi-receptor signaling. Published research is indexed in the peer-reviewed scientific literature.
Retatrutide Research Applications
In laboratory and preclinical settings, this peptide is studied across several areas of interest:
Metabolic & energy-expenditure research: examined in models of energy balance and metabolism.
GLP-1 receptor signaling: investigated for incretin-pathway activity in research models.
GIP receptor signaling: studied alongside GLP-1 pathways in receptor-interaction research.
Glucagon receptor signaling: explored for its role in the triple-agonist mechanism.
These describe areas of ongoing scientific investigation only, this compound is not a therapeutic product and no clinical outcomes are implied.
Supplied as a lyophilized powder, the peptide is typically reconstituted with bacteriostatic or sterile water for laboratory use. Store the sealed lyophilized vial at -20 °C, protected from light and moisture, for long-term stability. After reconstitution, store at 2–8 °C and use within the timeframe defined by your laboratory protocol. Handle using standard laboratory safety practices.
For Research Use Only
This product is intended strictly for laboratory and in-vitro research. It is not for human or veterinary use, consumption, or diagnostic application and is not a drug, food, or cosmetic. By purchasing, the buyer affirms they are a qualified researcher or institution. Browse our full catalog of research peptides.
Retatrutide Certificate of Analysis (COA), Third-Party Lab-Tested
The 10 mg batch is independently tested by Freedom Diagnostics (USA) and verified at 99.76% HPLC-UV purity, with identity confirmed by LC-MS. Its Certificate of Analysis is below. The 20 mg vial is shipping from a newer lot that has not yet completed third-party testing, and is supplied against our stated purity specification.
Tested by Freedom Diagnostics · Proudly tested in the USA · Reported 06/21/2026
For research use only. Not approved for human or veterinary use, diagnostic, therapeutic, or clinical applications. Results are specific to the sample(s) tested.
Tracy Sabbarese (verified owner) –