Retatrutide peptide: exploring its science, health benefits, and results

Absolutely. Each batch of our retatrutide peptide undergoes independent lab analysis to verify its identity, purity, and composition before any vials are shipped. Identity checks use mass spectrometry against the theoretical molecular weight of retatrutide (about 4845 Da), while purity is determined via reverse-phase HPLC, with a release standard of no less than 98%.

A certificate of analysis for the current batch is publicly available—it is linked on the product page and can be searched by lot number on the lab reports pageEndotoxin (USP 85) and sterility (USP 71) test results are posted beside it. If the lot number on your vial doesn't appear on the site, get in touch with us before using the product.

We process orders within 1-2 business days, and delivery takes up to 5 business days anywhere in the US. Orders exceeding $200 qualify for free shipping. As soon as the shipping label is created, you'll receive a tracking number via email.

The peptide is shipped as a lyophilized powder, which remains stable at room temperature during transit, so there is no extra charge for cold-chain shipping. Packages are discreet, padded, and include a printed COA for the batch inside.

Vials arrive containing lyophilized (freeze-dried) peptide powder, stable at ambient temperature during shipping. After receipt, keep unopened vials tightly sealed in a cool, dry location away from light. For long-term storage, keep them at or below -20°C.

When stored correctly, lyophilized peptides generally remain stable for 12-24 months, or even longer if kept frozen. After reconstitution, store the vial at 2-8°C in a refrigerator and use it within the period specified in our reconstitution and storage guide. Avoid frequent temperature changes: freeze-thaw cycles degrade peptides more quickly than steady cold storage.

Yes. Volume discounts are automatically applied in your cart at 5 and 10 vials: purchasing 5 or more gives you 5% off, and 10 or more gives you 10% off, applicable to any combination of sizes. For larger quantities, send us a wholesale request and we'll send you a quote.

Labs that order retatrutide peptide on a regular schedule can also inquire about reserving a specific lot, ensuring consecutive orders come from the same tested batch—useful for studies that require a single lot number across all trial arms.

The available payment options are displayed at checkout. If you encounter any issues on your end, just message us and we'll resolve them. There are no subscriptions or automatic renewals on this site: every order is a one-time purchase that you make deliberately.

No. Retatrutide is an investigational peptide. It has not been approved by the FDA or any other regulatory body, and the products sold here are strictly for laboratory research, not for human or veterinary use. Eli Lilly has completed phase 3 trials and is expected to file for regulatory approval—our FDA status article provides updates on every development.

This is also why every page on this site includes a research-use-only disclaimer, and why you must accept a research-use waiver during checkout. If you're seeking an approved GLP-1 medication, that's a matter for a licensed doctor, not a peptide supplier.

Retatrutide (development code LY3437943) is a synthetic 39-amino-acid peptide featuring a C20 fatty-diacid side chain, developed by Eli Lilly. It's sometimes called a "triple agonist" or "GGG tri-agonist" because a single peptide molecule activates three receptors simultaneously: GLP-1, GIP, and glucagon. This unique combination makes retatrutide peptide the most extensively studied compound in its class for metabolic pathway research.

We provide it as high-purity lyophilized powder in sealed glass vials of 10, 15, 20, 30, and 60 mg. For a comprehensive, easy-to-understand explanation, see our guide: what is retatrutide.

Most incretin peptides in research activate a single receptor (semaglutide targets GLP-1) or two receptors (tirzepatide targets GLP-1 and GIP). The retatrutide peptide adds the glucagon receptor as a third target, which is linked to greater energy expenditure in trial data, in addition to the appetite and glucose effects of the other two pathways.

In phase 2 trials, the highest dose of retatrutide led to an average weight loss of about 24% over 48 weeks—the largest reduction reported for any incretin-class compound at that time. For side-by-side comparisons, check our guides: vs tirzepatide, vs semaglutide, and vs other peptides.

Retatrutide is not available in pharmacies because it is not an approved medication anywhere. The peptide is offered by research-chemical suppliers, and the key differences among them center on verification: whether each lot has a public third-party COA, whether endotoxin and sterility data are published, and whether the company responds to questions about its testing.

Our product page displays the current lot's certificate before you place an order, and our guide to buying retatrutide online explains what to look for when evaluating any peptide vendor—including us.

Lyophilized retatrutide peptide is reconstituted with bacteriostatic water prior to use. The concentration depends on the amount of water added to the vial: for instance, adding 2 mL to a 10 mg vial results in 5 mg/mL. Our reconstitution guide covers the technique, storage after reconstitution, and common pitfalls, and the dosage calculator performs the mg-to-units calculation for any vial size and water volume.