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.
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 by an accredited third-party laboratory. A COA is included with every order.
- 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.
