Retatrutide carton · side view40 mg packaging shown
Peptide
Retatrutide research pen 20 mg / 40 mg total contents
The Zynx Retatrutide research pen uses a dual-chamber format, with 20 mg or 40 mg total contents per pen. UK and European delivery options are listed below.
Free UK delivery when you spend £25 or more. Eligible in-stock orders are dispatched the same working day, with tracked delivery available to selected European destinations.
Delivery estimate
Method
Free UK tracked delivery
Charge
Free
Dispatch
Mon, 9 Nov 2026
Delivery window
Estimated delivery Tue, 10 Nov 2026–Thu, 12 Nov 2026
Delivery windows are estimates, not guarantees. Dispatch is not the same as delivery.
Retatrutide 20 mg vs 40 mg: prices and contents
Compare the current price and stated total contents of one pen. Unit prices use the labelled total mass; delivery charges depend on the destination and order.
Supplied for laboratory and scientific research only. Not for human or veterinary use.
Dispatch
Same-day dispatch on eligible in-stock orders
Shipping and support
Free UK delivery when you spend £25 or more. Eligible in-stock orders are dispatched the same working day, with tracked delivery available to selected European destinations.
Choose your country at checkout to confirm product availability and delivery charges.
Delivery windows are estimates, not guarantees. Dispatch is not the same as delivery, and customs clearance is not controlled by Zynx.
Documentation
Supporting quality documentation is displayed where available.
Published papers describe research on the named compound or related molecules. They do not test, certify or endorse the specific material shown on this page, and they do not make the material approved for personal use.
Effects of retatrutide on body composition in people with type 2 diabetes: a substudy of a phase 2, double-blind, parallel-group, placebo-controlled, randomised trial
The Lancet Diabetes & Endocrinology, 2025
Trial stage
Phase 2 body-composition substudy
Participants
189 adults with type 2 diabetes
Duration
36-week assessment
What was measured
Total fat mass by DXA. The pooled 8 mg arms fell 26.1% from baseline, compared with 4.5% with placebo.
This substudy of an investigational medicine did not test any Zynx pen. It does not establish long-term clinical benefit or product safety.
Retatrutide is supplied as a dual-chamber research pen, with 20 mg or 40 mg total contents per pen. These are total contents, not administration instructions. For laboratory research only.
What is the difference between the 20 mg and 40 mg Retatrutide pens?
The 40 mg option has twice the stated total contents of the 20 mg option. Both are listed as dual-chamber research pens. Compare their current per-pen prices, price per stated milligram, product codes and availability in the options table. The total-content figure does not establish concentration or purity.
Is reta another name for Retatrutide?
Reta is informal shorthand for Retatrutide, also identified as LY3437943 in research literature. Zynx uses the full compound name, Retatrutide, on this product page.
Can I order Retatrutide research pens for UK delivery?
UK delivery is available for eligible orders. Select the 20 mg or 40 mg total-content option above to see its current price and availability. The delivery calculator shows the options for your destination; final delivery charges are confirmed at checkout. These materials are supplied for laboratory research only.
Is this a pre-mixed pen or a dual-chamber pen?
Zynx supplies a dual-chamber research pen. The research material and liquid are held in separate chambers within the cartridge, rather than together as a pre-mixed solution. The format guide explains the cartridge design; product documentation provides the specific handling requirements.
Do the published trials describe a Zynx batch?
No. The papers report controlled studies. They do not test a Zynx batch and they are not a laboratory report for a product on this site.
