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Research Peptide FAQs

Everything you need to know about our products and ordering process.

Retatrutide (LY3437943) is an investigational peptide that acts on three receptors at once — GIP, GLP-1 and glucagon. It is the broadest incretin compound in the catalogue and one of the most heavily studied. Everything here is for research and educational purposes; what we sell is not intended for human use.
Two ways: PayPal or Bitcoin. PayPal is the quickest — pick it at checkout and pay as normal. For Bitcoin, we show you the wallet address; send the exact BTC equivalent of your total and we release the order once it confirms on-chain, usually after one to three confirmations. Never used Bitcoin? Cash App handles it in about five minutes — buy BTC in the app and send it straight to our address. There's a guide linked at checkout. Payment is for research-use purchases only.
We dispatch seven days a week. Order before 2 PM ET and it goes out the same day; later than that and it goes the next. Once it's moving, domestic delivery is normally three to five days. US shipping is free. International is a flat $20.
Yep. Order 3 or more vials and we throw in a 5 ml bac water for free — it lands in your cart automatically, no code needed. Under 3 vials? Grab one separately for $10.
Yes — just ask. Every compound is tested by an independent third-party laboratory, and the Certificate of Analysis for the batch in stock is available on request. The tested purity, the method and the test date are printed on the product page too, so you can check those first.
≥98% is the floor. The number actually measured for the current batch is on the product page, next to the method used to measure it. Testing is done by an independent third-party laboratory, not in-house.
Yes. International shipping is a flat $20, added to your total automatically once you pick your country at checkout. Import rules in your own country are your responsibility.
It comes down to how many receptors each one hits. Semaglutide is a single GLP-1 receptor agonist. Tirzepatide is a dual GLP-1 and GIP agonist. Retatrutide (LY3437943) is a triple agonist — GLP-1, GIP and glucagon. One, two, three. All of them are research compounds, and retatrutide has not been approved for any clinical use.
CAS 2381089-83-2. The development code is LY3437943. Molecular weight is roughly 4731.3 g/mol. It's a 39-amino-acid peptide with a fatty-acid chain attached to extend its half-life.
Keep the freeze-dried powder at -20°C. Reconstitute with sterile bacteriostatic water. Once it's in solution, hold it at 4°C and use it inside two weeks. Don't freeze and thaw it repeatedly. In-vitro laboratory research only.
All sales are final. We do not accept returns, refunds, or exchanges. Because these are research materials, they cannot be restocked or resold once they leave our facility.

If your order arrives damaged, incorrect, or is lost in transit, contact us within 7 days of delivery (or of the expected delivery date, for a lost package) at orders@senditpeptides.com and we will make it right with a replacement or store credit. This is a fulfilment guarantee for our own errors, not a change-of-mind return window.

All products are for research use only and are not intended for human or veterinary consumption.
Research Background

What Is Retatrutide (LY3437943)?

Retatrutide (INN: LY3437943, CAS: 2381089-83-2) is an investigational triple incretin receptor agonist developed by Eli Lilly. It is the first peptide in its class to simultaneously target three receptors: the GIP receptor (glucose-dependent insulinotropic polypeptide), the GLP-1 receptor (glucagon-like peptide-1), and the glucagon receptor.

This triple-receptor mechanism distinguishes Retatrutide from earlier-generation compounds. Semaglutide activates only GLP-1 receptors; tirzepatide activates both GLP-1 and GIP receptors. Retatrutide's additional glucagon receptor agonism adds a third dimension to its metabolic research profile, making it the subject of active Phase 3 clinical investigation.

Our Retatrutide is supplied as lyophilized powder in a sterile vial, tested at ≥98% purity by HPLC with mass spectrometry identity confirmation. A Certificate of Analysis (CoA) is available for every batch. For in-vitro research and laboratory use only. Not for human consumption.

Key identifiers: CAS 2381089-83-2 · LY3437943 · Triple GIP/GLP-1/glucagon agonist · MW ~4731.3 g/mol · 39 amino acid peptide · Fatty acid chain for extended half-life
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