Peptide Watchdogs
Price index / Retatrutide
Weight-loss

Retatrutide

CAS 2381089-83-2 Also sold as Reta, RT, GLP-3R, LY3437943

A weight-loss research peptide. Live vendor vial prices, sorted lowest first.

For research use only. Not for human consumption. No health, dosing, or usage claims are made.

What Retatrutide is

Retatrutide (Eli Lilly research code LY3437943) is an investigational peptide that acts on three gut/metabolic hormone receptors (GIP, GLP-1 and glucagon). It is being studied in clinical trials and is not an approved medicine. Material sold to laboratories under this name is a research chemical, not a finished drug product.

Typemodified single-chain peptide (GIP/GLP-1/glucagon triple receptor agonist)
CAS number2381089-83-2
CategoryWeight-loss

Retatrutide has no PubChem compound record yet, so its molecular formula and weight are not published from an authoritative chemistry database. The on-file CAS (2381089-83-2) appears in ChEMBL and WHO INN records.

Regulatory status: Retatrutide is investigational and is not FDA-approved; as of 2026 it remains in clinical development with no approval record in Drugs@FDA.

Vial price (low)
$85
Vial price (high)
$200
Vial sizes
5, 6, 10, 12, 24 mg
Vendors listing
6
Verified
—

Price by vial size

sourced market ranges · Jul 2026
5 mg vial
$85–$85
6 mg vial
$90–$90
10 mg vial
$90–$145
12 mg vial
$150–$200
24 mg vial
$195–$195

Typical vendor vial prices, Jul 2026. Exact prices load with verified listings.

Compare vendors

vendor prices · lowest first
VendorVial priceCoupon
Simple Peptide
$0.05Best — View vendor ›
Precision Research Peptides
$0.13 WATCHDOG20 View vendor ›
Prime Lab Peptides
$0.16 — View vendor ›
Koi Peptides
$0.18 — View vendor ›
Protide Health
$0.20 — View vendor ›
BioInfinity Lab
$0.22 — View vendor ›
Kaia Peptides
$0.33 — View vendor ›
BioLongevity Labs
$0.50 — View vendor ›
Mile High Compounds
$1 — View vendor ›
PSPeptides
$3.60 — View vendor ›
Skye Peptides
$8.80 — View vendor ›
Comparing vial prices. Vial price is what you actually pay — no derived math to get wrong. Just match the vial size across vendors: a 10 mg vial against another 10 mg vial. Sizes for this compound are listed above. Need to plan a reconstitution? Use the calculator.

Where it shows up in research

literature areas · not a health claim
Metabolic and body-weight research (clinical trials)Glucose-regulation and type-2-diabetes research (clinical)Multi-receptor incretin pharmacology research (preclinical and clinical)

These are areas explored in the scientific literature and clinical trials; they are not health claims and do not indicate an approved use.

Storage & handling

Planning a reconstitution? Use the calculator — it is math for handling a vial, not dosing.

Looking at this for yourself? Retatrutide is a research compound — whether it is right for a person is a medical question we cannot answer. Talk to a licensed clinician. Everything on this page is for laboratory research use only.

Sources & further reading: Triple-Hormone-Receptor Agonist Retatrutide for Obesity — Phase 2 Trial (PubMed) · Retatrutide — A Game Changer in Obesity Pharmacotherapy (NCBI PMC) · FDA — Drugs@FDA (no approval record for retatrutide)
How we source this ›

Frequently asked

How much does Retatrutide cost?
About $85–$200 per vial, depending on vial size. Compare the same size across vendors.
Why do Retatrutide prices vary so much?
Vial sizes differ, so always compare the same vial size across vendors. Batch testing, stock, and pack discounts move the true cost too — see what "Verified" means.
How are Retatrutide vendors verified?
A vendor earns a Verified badge only after independent batch testing (HPLC purity + mass-spec identity) checks out against its COA. Verification is never for sale.

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