Buy Retatrutide Research Peptide in California | QSC Peptides
QSC Peptides supplies retatrutide (LY3437943) research peptide to California researchers with domestic shipping, ≥99% HPLC purity, and a Janoshik-verified Certificate of Analysis on every batch.
California — USA domestic warehouse
2–5 business days
Typical delivery
≥99%
HPLC purity
Janoshik
Independent COA
Shipping to California
Ships from QSC’s USA domestic warehouse. No international customs delays.
Warehouse
Service
Estimated delivery
Shipping cost
USA domestic warehouse
Standard
2–5 business days
Free on qualifying orders
About Retatrutide (LY3437943)
Retatrutide is Eli Lilly’s investigational triple receptor agonist, simultaneously activating GLP-1R (glucagon-like peptide-1 receptor), GIPR (glucose-dependent insulinotropic polypeptide receptor), and GCGR (glucagon receptor). Phase 2 data (Jastreboff et al., NEJM 2023) reported 24.2% mean body weight reduction at 48 weeks at the 12mg dose — the largest reported for any injectable drug in Phase 2 at that time. Phase 3 TRIUMPH trials are ongoing.
Adding glucagon receptor activation to the dual GLP-1R+GIPR mechanism of tirzepatide introduces thermogenic and lipolytic pathways that increase total energy expenditure — the proposed mechanism behind retatrutide’s greater weight reduction vs dual agonists. For researchers comparing triple vs dual receptor agonism, retatrutide and tirzepatide parallel experimental arms are the standard approach to isolating the GCGR contribution.
Reconstitution and storage
Reconstitute QSC retatrutide in bacteriostatic water to a 1mg/mL stock. Store lyophilized powder at -20°C (stable 12–24 months sealed). Reconstituted solution: refrigerate at 4°C and use within 3–4 weeks, or aliquot and freeze at -20°C for up to 6 months.
QSC Quality Standard
Specification
QSC standard
Purity
≥99% by HPLC peak area — chromatogram in COA
Identity
MS molecular weight confirmation on every batch
COA
Janoshik-independent, publicly verifiable
Manufacture
In-house Fmoc SPPS — Qingdao facility
Shipping
Domestic USA domestic warehouse — 2–5 business days
Frequently Asked Questions
Where can I buy retatrutide research peptide in California?
QSC Peptides ships retatrutide to California researchers from our USA domestic warehouse. Typical delivery is 2–5 business days after dispatch. All orders include a Janoshik-verified COA confirming ≥99% HPLC purity and MS identity on every batch.
What is retatrutide used for in research?
Retatrutide (LY3437943) is used in laboratory research to study triple GLP-1R/GIPR/GCGR receptor co-agonism, obesity and metabolic disease models, the contribution of glucagon receptor activation to weight reduction beyond dual GLP-1R+GIPR agonism, hepatic glucose metabolism, NASH/liver fibrosis models, and cardiovascular metabolic research. It is not approved for human use.
How long does retatrutide delivery take to California?
Orders to California typically arrive within 2–5 business days after dispatch from QSC’s USA domestic warehouse. Tracking is provided for all shipments.
What purity is QSC retatrutide?
QSC retatrutide is verified at ≥99% purity by HPLC and confirmed by mass spectrometry on every batch. The Janoshik-independent Certificate of Analysis is published on the product page. QSC manufactures retatrutide in-house via Fmoc SPPS at our Qingdao facility.
Research Use Only: All products sold on qscpeptide.com are intended strictly for laboratory research purposes only. They are not approved for human consumption, veterinary use, or any other application. Researchers are responsible for understanding and complying with local regulations in their jurisdiction.
