Research-GradeRetatrutideUK Verified.
Every vial independently tested to 98%+ purity. Certificate of Analysis included. Same-day UK dispatch.
Shop Retatrutide
50+
Verified Reviews
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.
94.0%
Minimum Purity Guaranteed
Why Choose Reta Source UK.
We supply research-grade Retatrutide with full traceability — tested, verified, and dispatched from the UK.
HPLC-UV Verified Purity
Every batch independently tested to ≥98% purity at an ISO-accredited UK laboratory.
UK Sourced & Compliant
Controlled conditions from manufacture to dispatch. Same-day tracked delivery as standard.
Certificate of Analysis Included
Full CoA available on request. Identity, purity, and related substances confirmed per batch.
Quality
You Can Verify.
Every order ships with independently verified purity data. No guesswork — just documented, reproducible results from UK-accredited labs.
Independently tested purity
Every batch tested to ≥98% purity by Janoshik, one of the most trusted independent peptide testing laboratories.
Certificate of Analysis
Full CoA issued per batch. Identity, purity, and related substances confirmed before dispatch.
Same-day UK dispatch
Orders placed before 12pm dispatched the same day. Tracked, insured, and discreetly packaged.
Expert support
UK-based team available for reconstitution guidance, protocol questions, and order support.
Choose Your Vial.
All vials are lyophilised. Certificate of Analysis included.
lyophilised · per vial
Protocol design and dose calibration
lyophilised · per vial
Lowest cost per milligram
lyophilised · per vial
Fewest vials per protocol
Order To Door In Four Steps.
A fully tracked process from order through to delivery.
01
Order
Select your vial size and add BAC Water if needed. Checkout takes under two minutes.
02
Verified
Your order is confirmed immediately. Every batch has a Certificate of Analysis — request yours at any time.
03
Dispatched
Dispatched same or next working day in cold-chain compliant, discreet packaging with a tracked label.
04
Delivered
Delivered to your door within 1–2 working days. A preparation guide is included with every order.
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.
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 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 replied within the hour. Proper service."
"The 20mg vial is great value. Requested the CoA out of curiosity and it came back the same day, matched exactly what was listed."
"Arrived next day, well packaged and exactly as described. The reconstitution guide 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 replied within the hour. Proper service."
"The 20mg vial is great value. Requested the CoA out of curiosity and it came back the same day, matched exactly what was listed."
"First order had a courier delay but they messaged me before I even noticed and kept me posted. Product was spot on when it arrived."
"Excellent quality and fast delivery. The Janoshik CoA gave me confidence I was getting exactly what was advertised. Very impressed."
"Switched from another UK supplier after a friend recommended Reta Source. Night and day difference in communication and packaging."
"First order had a courier delay but they messaged me before I even noticed and kept me posted. Product was spot on when it arrived."
"Excellent quality and fast delivery. The Janoshik CoA gave me confidence I was getting exactly what was advertised. Very impressed."
"Switched from another UK supplier after a friend recommended Reta Source. Night and day difference in communication and packaging."
"Straightforward ordering process and the vial arrived within 24 hours. Independent testing docs were a nice touch — builds real trust."
"Third order now. Consistency has been perfect every time. The 30mg is great value if you plan to run a longer protocol."
"Replied to my email the same evening with detailed reconstitution advice. Rare to find that level of support alongside competitive pricing."
"Straightforward ordering process and the vial arrived within 24 hours. Independent testing docs were a nice touch — builds real trust."
"Third order now. Consistency has been perfect every time. The 30mg is great value if you plan to run a longer protocol."
"Replied to my email the same evening with detailed reconstitution advice. Rare to find that level of support alongside competitive pricing."
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\u2013100 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.
Common Questions,
Answered.
Everything you need to know about Retatrutide and ordering from us.
Retatrutide is a research peptide currently in Phase 3 clinical trials. It works by targeting multiple hormone receptors involved in metabolic regulation. Reta Source UK supplies it for research purposes only.
Every vial is independently tested to =98% purity by a third-party ISO-accredited laboratory before dispatch. A Certificate of Analysis is available for every batch � just ask.
BAC Water is a sterile solution used to prepare your vial before use. Your Retatrutide arrives as a powder � BAC Water dissolves it into a usable form. If you don't already have it, add it to your order.
Draw up your BAC Water and slowly inject it down the side wall of the vial. Gently swirl until fully dissolved � never shake. Full step-by-step instructions are included with every order.
Keep your vial in the fridge (2�8�C) until use. Once prepared with BAC Water, store refrigerated and use within 28 days. Do not freeze once prepared.
Orders placed before 12pm on a working day are dispatched the same day. All orders are sent via tracked courier. Typical delivery is 1�2 working days within the UK.
Yes � for every batch. The CoA shows the batch number, purity percentage, and testing methodology. Request yours through our support team after ordering.
We stock 10mg, 20mg, and 30mg vials. Pre-loaded pens are also available � contact us for pen enquiries.
Reta Source UK supplies Retatrutide for research purposes only. Not for human consumption.
Start Your Journey Today.
Every order ships with an independent lab report. Place before 12pm and it dispatches the same day.
Reconstitution Guide
Step-by-step instructions for preparing your vial included with every order.
Certificate of Analysis
Independent Janoshik lab results available on request for every batch.
UK Compliant Dispatch
Tracked, insured, and discreetly packaged. Same-day before 12pm.