Retatrutide UK — HPLC-Verified Research Kits | Regena

Retatrutide is a 39-amino-acid synthetic peptide engineered as a balanced agonist of three receptors: GLP-1, GIP and glucagon. The added glucagon-receptor activity is the structural feature that differentiates it from tirzepatide (dual GLP-1/GIP) and semaglutide (GLP-1 only). Published phase-2 data has driven the surge in UK research interest.

Retatrutide is sold as a lyophilised research peptide for in-vitro and preclinical use only — it is not a UK-licensed medicine and Regena does not sell it for human consumption. UK research teams and qualified buyers can order direct from our Marbella facility with tracked, 5-14 day delivery and a research-use customs declaration included with every shipment.

Each retatrutide batch is independently tested by Janoshik Analytical before any vial is released. Reverse-phase HPLC quantifies main-peak purity (target ≥99.0%), gradient mass spectrometry confirms molecular weight, and Karl Fischer reports residual moisture. The Janoshik PDF is downloadable from our lab reports page and matches the batch number printed on the vial cap.

Published phase-2 protocols escalated doses from 0.5 mg to 12 mg weekly. Research handlers typically reconstitute lyophilised retatrutide in bacteriostatic water to a 5 mg/ml or 10 mg/ml stock for easy microlitre dispensing. Always defer to your SOP and the printed COA — this page is reference material, not a dosing recommendation.

Mounjaro engages two receptors (GLP-1 + GIP). Retatrutide adds glucagon-receptor activity, which research literature hypothesises increases hepatic lipid oxidation and resting energy expenditure. Phase-2 retatrutide data has shown larger effect sizes than tirzepatide phase-2 readouts, but head-to-head trial data is limited — see our full retatrutide vs Mounjaro comparison page for the side-by-side.

Hold the unopened lyophilised vial at 2–8 °C; freeze at −20 °C only if it will not be reconstituted within 8–12 weeks. Reconstitute with bacteriostatic water (0.9% benzyl alcohol) for in-use stability up to 28 days under refrigeration. Aliquot before first freeze to avoid repeat freeze–thaw cycles, which are the single biggest cause of measurable potency loss across long-acting analogues.

All Regena pricing is in EUR with no hidden conversion fees. UK delivery is tracked DHL Express, typically 5-14 days door-to-door, with a customs declaration matched to the COA. We do not ship to jurisdictions that prohibit research-peptide import — the consultations team will confirm before any order is placed.