CW
Retatrutide purity was outstanding
Running metabolic assays with Retatrutide. Lot had >99% purity by reverse-phase HPLC, above spec. Mass spec confirmed molecular weight. Best peptide supplier we've worked with.
HPLC Verified
>98% Purity
COA Included
APEX Performance & Metabolic
Retatrutide
$234.62
Retatrutide is a novel triple agonist of the GIP, GLP-1, and glucagon receptors in Phase III clinical development. Phase II data showed up to 24.2% body weight reduction at 48 weeks, the highest weight loss reported for any injectable compound in clinical trials.
| Format | Lyophilized Vial |
|---|---|
| Dosage | 10mg |
| Purity | >98% |
| Sub-Line | APEX |
Also available: Retatrutide Capsules (10mg) →
In Stock, Overnight and 2–3 day delivery available
Product Information
Retatrutide | Triple GIP/GLP-1/Glucagon Receptor Agonist, Research Grade
Retatrutide (LY3437943) is an investigational once-weekly injectable triple receptor agonist simultaneously targeting GIP (glucose-dependent insulinotropic polypeptide), GLP-1 (glucagon-like peptide-1), and glucagon receptors. Developed by Eli Lilly, it is in Phase III clinical trials and represents the leading edge of incretin-based obesity pharmacology.
Mechanism of Action
- GLP-1R agonism, reduces appetite, delays gastric emptying, stimulates glucose-dependent insulin secretion
- GIPR agonism, synergistic with GLP-1 for weight reduction; modulates adipose tissue GIP signalling
- Glucagon receptor agonism, increases energy expenditure and hepatic fat oxidation, differentiating Retatrutide from dual GIP/GLP-1 agonists
- Additive efficacy, triple mechanism achieves weight loss beyond tirzepatide in comparative Phase II data
Research Areas
Phase II dose-ranging trial (n=338, 48 weeks) reported 24.2% mean body weight reduction at highest dose, exceeding any prior injectable compound in clinical history. Phase III trials in obesity and type 2 diabetes are ongoing. Also studied in NASH, heart failure, and sleep apnoea.
Independent Lab Verification
This compound has been independently tested by Vanguard Laboratory, an ISO 17025:2017-accredited third-party laboratory (A2LA Certificate #6377.01.01), confirming a chromatographic purity of ≥99.80% via HPLC-UV/VIS analysis. This identity and purity data is what verifies the compound matches its labeled specification, not just a claim we make ourselves.
For Research Use Only. Rainbow Peptide supplies Retatrutide exclusively for in vitro and laboratory research purposes. Not for human or veterinary use.
Frequently Asked Questions
- What is Retatrutide?
- Retatrutide is a novel triple agonist of the GIP, GLP-1, and glucagon receptors in Phase III clinical development. Phase II data showed up to 24.2% body weight reduction at 48 weeks, the highest weight loss reported for any injectable compound in clinical trials.
- Is Retatrutide for sale at Rainbow Peptide?
- Yes. Retatrutide is available for purchase with Certificate of Analysis confirming >98% HPLC purity. Every order Overnight and 2–3 day delivery available. For Research Use Only.
- What purity is your Retatrutide?
- Rainbow Peptide's Retatrutide is >98% pure, HPLC verified through independent third-party laboratory testing, including work performed by Vanguard Laboratory (ISO 17025:2017-accredited, A2LA Certificate #6377.01.01). A COA is included with every order.
- What does the Certificate of Analysis actually verify?
- A COA reports identity (confirming the compound is what it's labeled as, via HPLC-UV/VIS matched against a reference standard) and assay/content (the measured purity percentage). Together, this verifies a batch matches its labeled specification, rather than relying on a purity claim alone.
- Is Retatrutide safe for human use?
- No. Retatrutide is strictly For Research Use Only (RUO). It is not intended for human consumption and is not intended to diagnose, treat, cure, or prevent any disease.
- How quickly does Retatrutide ship?
- Overnight and 2–3 day delivery available. Ships in temperature-controlled packaging.
Third-Party Verified
Every Order Ships with a Certificate of Analysis
We don't just claim purity, we prove it. Every batch of Retatrutide is independently tested by an accredited third-party laboratory before it reaches you. Your COA is linked to your specific lot number.
- HPLC purity analysis, minimum threshold >98%
- Mass spectrometry, molecular weight confirmation
- Lot number traceable to your order
- Endotoxin limits verified, safe for cell-based assays
RAINBOW PEPTIDE LABS CERTIFICATE OF ANALYSIS
Product Retatrutide
Lot # RP-00044-A
HPLC Purity >98.0% >98.5% PASS
Mass Spec (MW) Confirmed Confirmed PASS
Endotoxin <1 EU/mg <0.5 EU/mg PASS
Visual Inspection White powder White powder PASS
What Researchers Say
Verified purchases from active research labs and scientists
5.00
★★★★★
2 verified reviews DP
Ipamorelin quality confirmed via QC
Internal verification confirmed COA data. Purity was 98.6% HPLC. Peptide behavior in our assay was consistent with published data. Will order again for next study phase.
BS
Consistent performance for research
AOD-9604 arrived quickly and in excellent condition. Cold pack preserved temperature. COA was thorough. Results in metabolic assays consistent with expected parameters.
