Retatrutide (20mg)

For Laboratory Research Use Only — Not for Human or Animal Consumption. Must be 18+ to purchase. Retatrutide — often abbreviated to reta in research and procurement contexts — is a synthetic triple agonist engineered to activate three distinct metabolic receptors simultaneously: glucagon-like peptide-1 (GLP-1), gastric inhibitory polypeptide (GIP), and the glucagon receptor (GCGR). This tri-receptor architecture is the most expansive incretin-based targeting profile currently under active investigation, and it is why retatrutide has become one of the most requested research peptides in metabolic science. SF Bay Area Peptides supplies retatrutide as a 20mg lyophilized vialSame-day courier delivery across the San Francisco Bay Area; FedEx 2Day nationwide.

Mechanism of action

Each receptor targeted by retatrutide plays a distinct role in energy and metabolic homeostasis, and the research interest lies in what happens when all three are engaged at once. GLP-1 activation reduces glucagon secretion and promotes insulin release in a glucose-dependent manner — the same axis targeted by first-generation incretin compounds. GIP agonism modulates adipose tissue lipid handling and amplifies beta-cell insulin response, adding a second incretin pathway that dual agonists such as tirzepatide also engage. Glucagon receptor (GCGR) agonism is the component that distinguishes retatrutide. Glucagon signalling is conventionally viewed as opposing GLP-1 activity, but within a balanced triple-agonist construct it contributes to increased energy expenditure through thermogenic pathway activation. Characterising that balance — the point at which glucagon agonism adds energy expenditure without undermining glycemic control — is the central question in current retatrutide research. The result is a metabolic signalling cascade dimensionally broader than dual GLP-1/GIP agonism alone, combining insulinotropic activity with energy-expenditure modulation in a single molecule.

Research history

Retatrutide entered formal investigation as part of growing research interest in multi-receptor incretin pharmacology, following the dual-agonist data generated by tirzepatide. Phase 1 and Phase 2 trial data published in peer-reviewed literature documented its influence on body weight, glycemic markers and hepatic fat content under controlled conditions. The magnitude of metabolic change observed in those early trials is what positioned retatrutide as a focal compound for ongoing triple-agonist research, and it accounts for the volume of laboratory demand the compound now attracts.

Active research areas

Current published and ongoing research examines:

• Interactions between simultaneous GLP-1/GIP/GCGR activation and hepatic lipid metabolism
• The glucagon receptor component’s influence on thermogenic tissue activity and total energy expenditure
• Comparative efficacy modelling against dual-agonist and single-agonist incretin compounds
• Applications in non-alcoholic fatty liver disease (NAFLD) research models
• Receptor selectivity and binding-affinity characterisation across the three target receptors

The glucagon receptor contribution generates particular academic interest, since it represents the clearest mechanistic departure from the incretin compounds that preceded it.

Retatrutide vs Tirzepatide — how they differ

These are the two most requested compounds in our metabolic research category, and researchers frequently ask how they compare. The distinction is receptor coverage.

Researchers modelling comparative incretin activity commonly acquire both. See our Tirzepatide (30mg) listing, or browse the full Metabolic Research category.

Specifications and format

We supply retatrutide in a single format: a 20mg lyophilized vial. We do not currently stock 5mg or 30mg presentations of this compound — the 20mg vial is the format our laboratory customers request most consistently for multi-experiment work.

• Format: 20mg lyophilized powder, sealed vial
• SKU: RT20
• Purity: ≥98% by HPLC
• Storage: Store sealed and away from light. Controlled climate at −20°C for long-term stability.
• Testing: Third-party HPLC verified

Lyophilized presentation is chosen for stability in transit and in storage — a critical consideration for a compound that may sit in a research inventory across a multi-month study period.

How is retatrutide tested?

Every lot is independently tested by a third-party laboratory, with identity and purity confirmed by high-performance liquid chromatography (HPLC). Testing is carried out on each lot before it is released for sale.

Where can I read the research on retatrutide?

We do not paraphrase research findings on this page. For a compound supplied for laboratory use, the primary sources are what matter, and they are public: the peer-reviewed record is indexed on PubMed, and registered clinical studies are listed on ClinicalTrials.gov. Both are maintained by the U.S. National Institutes of Health and are free to search.

How much does retatrutide cost?

Retatrutide (20mg) is $119.00 per vial, in stock and available for immediate dispatch. That works out to $5.95 per mg, which is the figure worth comparing across suppliers — headline vial prices are not comparable when vial sizes differ. There are no hidden surcharges, no payment-processor fees added at checkout, and no minimum order. Delivery is costed separately and transparently: same-day Bay Area courier from $19.95 depending on your city, or flat-rate FedEx 2Day nationwide. You can check the exact courier fee for your city before you order. Volume and institutional pricing is available for laboratories ordering in quantity — email support@sfbayareapeptides.com with your requirements.

Where can I buy retatrutide?

You can buy retatrutide online directly from this page. SF Bay Area Peptides is a San Francisco–based research-compound supplier shipping nationwide, and we hold stock locally rather than drop-shipping — which is why same-day delivery is possible at all. Order before 12:00 p.m. Pacific on a business day and your retatrutide qualifies for same-day courier delivery across the San Francisco Bay Area — San Francisco, Oakland, San Jose, Fremont, Sunnyvale, Santa Clara and 100+ more cities. Outside the Bay Area, orders ship FedEx 2Day in temperature-controlled packaging anywhere in the United States. See our Buy Retatrutide in San Francisco page for local delivery specifics, or the full delivery zones and pricing. Payment is by debit or credit card at checkout — see how payment works if you would like the detail before ordering. For Laboratory Research Use Only — Not for Human or Animal Consumption. Not for diagnostic or therapeutic use. Must be 18+ to purchase.