Premium RetatrutideSourced from the UK.
Every vial independently tested to 98%+ purity. CoA included. Same-day UK dispatch. Calculate your dose →
Premium RetatrutideSourced from the UK.
Every vial independently tested to 98%+ purity. CoA included. Same-day UK dispatch. Calculate your dose →
The Triple Agonist In Phase 3 Trials.
Retatrutide is a research peptide currently in Phase 3 clinical trials, studied for its effects on metabolic regulation. Reta Source UK supplies research-grade Retatrutide tested to ≥98% purity, with Certificate of Analysis available and same-day UK dispatch.
View vials→Research-grade purity
Every batch independently tested to research-grade purity, with full Certificate of Analysis available on request.
UK sourced & verified
Sourced through verified UK supply chains. Compliant storage, handling, and dispatch on every order.
Fast, discreet dispatch
Orders dispatched same or next working day. Discreet packaging as standard. Tracked UK delivery.
Choose Your Vial.
All vials are lyophilised. CoA available on request.
Retatrutide
10mg Vial
Retatrutide 10mg Vial
Starting quantity for protocol design and dose calibration. Ships same day, CoA on request.
£3.50/mg
Retatrutide
20mg Vial
Retatrutide 20mg Vial
Most ordered vial size. Suited to extended research protocols with the best cost-per-milligram balance.
£2.25/mg
Retatrutide
30mg Vial
Retatrutide 30mg Vial
High-volume vial for sustained research programmes. Lowest cost per milligram.
£2.50/mg
Quality You Can Verify.
Everything researchers expect from a UK supplier.
Research-Grade Purity
Every vial independently tested at a third-party ISO-accredited lab. Purity confirmed before dispatch, no exceptions.
Certificate of Analysis
Full CoA provided on request for every batch — batch number, purity percentage, and testing methodology included.
UK Compliant Supply
Sourced, stored, and dispatched entirely within the UK. Handled under controlled conditions from our facility to your door.
Same-Day Dispatch
Orders placed before 12pm dispatched same day. Tracked, insured, and discreetly packaged as standard.
Transparent Pricing
No hidden fees. Clear per-vial pricing with bulk discounts. BAC Water bundles priced fairly with no markup games.
Expert Support
UK-based team available for reconstitution guidance, dosing protocol questions, and order support.
Trusted By Researchers.
What scientists and research professionals say about Reta Source UK.
"Arrived next day, well packaged and exactly as described. The reconstitution guide that came with it was clear and genuinely useful. Will be ordering again."
"Ordered twice now and both times it's been seamless. Fast dispatch, discreet packaging, and the support team actually replied within the hour when I had a question. Proper service."
"The 20mg vial is great value. I requested the CoA out of curiosity and it came back the same day, matched exactly what was listed. Not something you get from most suppliers."
"First order had a courier delay, outside their control, but they messaged me before I even noticed and kept me posted. Product was spot on when it arrived. Switched from another supplier and won't be going back."
"Arrived next day, well packaged and exactly as described. The reconstitution guide that came with it was clear and genuinely useful. Will be ordering again."
Tools & Guides.
Everything you need to research, reconstitute, and dose correctly.
Retatrutide Dose Calculator
Injection volume, syringe units & vial supply
Vial size
Frequency
Inject volume
ml
Syringe units
IU (U-100)
Doses per vial
injections
Weeks supply
weeks
U-100 insulin syringe scale (0–100 IU)
For research purposes only. Calculations based on U-100 insulin syringe. Always verify independently before use.
Research Articles
What Is Retatrutide? A Researcher's Introduction
Retatrutide (LY3437943) is a triple agonist targeting GLP-1, GIP, and glucagon receptors. Covers mechanism, research applications, and what makes it distinct from earlier GLP-1 compounds.
How To Reconstitute Peptide Vials Correctly
Step-by-step guide to reconstituting lyophilised peptide vials using bacteriostatic water. Covers sterile technique, storage, and common errors to avoid.
Understanding Purity & Certificate of Analysis
What ≥98% purity actually means, how to read a CoA, and why HPLC-verified peptides matter for reliable research outcomes.
Peptide Storage: Lyophilised vs Reconstituted
Lyophilised peptides are stable for months at room temperature; reconstituted vials require refrigeration. Full breakdown of optimal storage to maintain potency.
Order To Door In Four Steps.
A fully tracked process from order through to delivery.
Order
Select your vial size and add BAC Water if needed. Checkout takes under two minutes.
Verified
Your order is confirmed immediately. Every batch has a Certificate of Analysis — request yours at any time.
Dispatched
Dispatched same or next working day in cold-chain compliant, discreet packaging with a tracked label.
Delivered
Delivered to your door within 1-2 working days. A preparation guide is included with every order.
Common Questions.
Everything you need to know about Retatrutide and ordering from us.
Reta Source UK supplies Retatrutide for research purposes only. Not for human consumption.
Order Retatrutide
From Reta Source UK.
Every order includes proof of quality from an independent lab. Place your order before 12pm and it ships the same day.