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

Yes, without question. Before any vials go out, every batch of our retatrutide peptide is sent for independent lab analysis to confirm its identity, purity, and composition. Identity is confirmed by mass spectrometry against retatrutide's theoretical molecular weight (about 4845 Da), and purity is measured by reverse-phase HPLC, with a release threshold of at least 98%.

A certificate of analysis covering the current batch is openly accessible—you'll find the link on the product page and you can look it up by lot number on the lab reports pageEndotoxin (USP 85) and sterility (USP 71) results are published alongside it. Should the lot number printed on your vial not show up on the site, please contact us before using the product.

Orders are processed within 1-2 business days, and delivery anywhere in the US takes up to 5 business days. Orders above $200 are eligible for free shipping. Once the shipping label is generated, a tracking number will be sent to you by email.

This peptide is supplied as a lyophilized powder, which stays stable at room temperature while in transit, so no cold-chain shipping surcharge applies. Each package is discreet and padded, with a printed COA for the batch enclosed.

The vials you receive hold lyophilized (freeze-dried) peptide powder, which remains stable at ambient temperature during shipping. Once it arrives, store unopened vials tightly sealed somewhere cool, dry, and out of the light. For long-term storage, keep them at or below -20°C.

Stored properly, lyophilized peptides typically stay stable for 12-24 months, and can last even longer when kept frozen. Once reconstituted, keep the vial refrigerated at 2-8°C and use it within the timeframe given in our reconstitution and storage guideAvoid repeated temperature swings: freeze-thaw cycles break down peptides faster than consistent cold storage.

Yes. Volume discounts apply automatically in your cart at 5 and 10 vials: buy 5 or more and get 5% off, buy 10 or more and get 10% off, and this works across any mix of sizes. For bigger quantities, send us a wholesale request and we'll provide a quote.

Labs ordering retatrutide peptide on a recurring basis may also ask about reserving a specific lot, so that consecutive orders come from the same tested batch—handy for studies that need one lot number across all trial arms.

The payment options open to you appear at checkout. Should you run into any trouble on your side, simply send us a message and we'll sort it out. This site has no subscriptions and no automatic renewals: each order is a one-time purchase you choose to make.

No. This peptide remains investigational and has not been approved by the FDA or any other regulatory agency. Everything sold here is intended solely for laboratory research and is not for human or veterinary use. Phase 3 trials have been completed by Eli Lilly, and a regulatory filing is anticipated—our FDA status article brings you the latest news on all developments.

That's also why a research-use-only disclaimer appears on every page, and why you must accept a research-use waiver during checkout. If you're looking for a GLP-1 medication that has been approved, you should consult a licensed physician, not a peptide supplier.

Retatrutide (development code LY3437943) is a synthetic 39-amino-acid peptide with a C20 fatty-diacid side chain, created by Eli Lilly. It is sometimes referred to as a "triple agonist" or "GGG tri-agonist" because one peptide molecule activates three receptors at once: GLP-1, GIP, and glucagon. This distinctive combination makes retatrutide peptide the most thoroughly studied compound in its class for metabolic pathway research.

We supply it as high-purity lyophilized powder in sealed glass vials containing 10, 15, 20, 30, and 60 mg. For a detailed, straightforward explanation, see our guide: what is retatrutide.

Most incretin peptides studied activate either one receptor (semaglutide targets GLP-1) or two (tirzepatide targets GLP-1 and GIP). Retatrutide peptide adds the glucagon receptor as a third target, which in trial data is associated with greater energy expenditure, alongside the appetite and glucose effects of the other two pathways.

In phase 2 trials, the highest dose of retatrutide resulted in 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 cannot be obtained from pharmacies because it is not an approved medication anywhere. The peptide is sold by research-chemical suppliers, and the main differences among them come down to verification: whether each lot has a public third-party COA, whether endotoxin and sterility data are published, and whether the company answers questions about its testing.

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

Lyophilized retatrutide peptide is reconstituted with bacteriostatic water before use. The concentration depends on the volume of water added to the vial: for example, adding 2 mL to a 10 mg vial yields 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.