How does the Retatrutide 20mg vial differ from 10mg?

Retatrutide 20mg is the higher-concentration presentation of the same pharmaceutical-grade lyophilised peptide. It supports extended research protocols with the same ≥98% HPLC purity, third-party CoA and Manchester same-day dispatch.

Is Retatrutide 20mg legal to buy in the UK?

Yes — for in-vitro laboratory research only. Retatrutide is not a licensed medicine in the United Kingdom and is not approved by the MHRA for human or veterinary use. Buyers must be 18 or over.

What is the recommended storage for 20mg vials?

Store the lyophilised vial at -20°C, sealed and protected from light. After reconstitution with bacteriostatic water (0.9% benzyl alcohol), refrigerate at 2–8°C and use within 28 days.

Is the CoA the same for the 20mg lot?

Each Retatrutide lot — both 10mg and 20mg vials — is tested independently and ships with its own batch-matched CoA from Janoshik Analytical or Aspen Bioanalytics.

Why choose 20mg over 10mg?

Researchers running extended in-vitro protocols typically prefer the 20mg vial because it reduces per-mg cost and consolidates lot handling, while maintaining identical synthesis, purity and verification standards.

For Research Purposes Only · Not For Human Consumption

Must be 18+ · COA On Every Vial · Royal Mail Tracked

COA On Every Single Vial

Research Use Only · Not For Human Consumption

Shipped from Manchester, UK

Independently Tested · Janoshik & Aspen Bio

Stored at −20°C Until Dispatch

Home/Shop/Retatrutide 20mg

Best Value≥98% (HPLC-UV)

Batch LX-2501

Third-party tested

CoA available

UK dispatched

4.9· 247 verified reviews

Metabolic Research

Buy Retatrutide 20mg UK | Research Grade

Name: Retatrutide 20mg
Brand: UK Peptides
SKU: UKP-RETA-20MG
Price: 99.99 GBP
Availability: InStock
Rating: 4.8 (3186 reviews)

Higher-dose triple-receptor GLP-1, GIP and glucagon agonist for extended research protocols. Lyophilised powder with batch-matched Certificate of Analysis.

Vial size

10mg£59.99 20mg£99.99

£99.99

In stock

Inc. VAT · Free UK shipping on orders over £50

✓ Free shipping on this order

SSL encrypted · Same-day dispatch before 3pm · CoA on this lot

Order within 8hrs 58min for same-day dispatch

What ships with your order

1 × Retatrutide 20mg — lyophilised, sealed glass vial.
Signed CoA for batch LX-2501 — HPLC-UV purity + mass-spec identity, by Janoshik Analytical.
Cold-chain insulated mailer — ice pack included, vial stays <10°C in transit.
Royal Mail Tracked 24 — same-day dispatch on orders before 3pm GMT, Mon–Fri.

Research Compound

About Retatrutide

The 20mg presentation of Retatrutide (LY3437943) — a triple agonist targeting GLP-1, GIP and glucagon receptors. Same pharmaceutical-grade lyophilised powder as the 10mg vial, ≥98% HPLC verified, full third-party certificate of analysis included. UK Peptides supplies retatrutide strictly for in-vitro and preclinical laboratory research. This compound is not approved for human use and is not a licensed medicine.

Research areas

GLP-1/GIP/glucagon receptor signalling
Metabolic pathway modelling
Adipogenesis & lipid metabolism
In-vitro obesity models

Certificate of Analysis

Retatrutide 20mg

Independent lab: Janoshik Analytical
Batch number: LX-2501
Method: HPLC-UV + MS
Result: ≥98% (HPLC-UV)

The CoA you download is the exact certificate produced for this lot — no edits.

Storage & handling

Keep it stable, keep it sterile

Storage: Store lyophilised powder at -20°C in a sealed vial. Protect from light and moisture. Allow the vial to reach room temperature before opening to prevent condensation entering the vial. Do not store in a frost-free freezer. Reconstitution: Reconstitute using bacteriostatic water (0.9% benzyl alcohol). Add solvent slowly down the side of the vial — do not shake. Allow to dissolve gently at room temperature. Reconstituted stability: Once reconstituted, store at 2–8°C (refrigerated). Use within 28 days. Do not refreeze after reconstitution. Shipping: All vials are dispatched in insulated mailers with ice packs to maintain cold chain during Royal Mail Tracked 24 transit.

+ Add Bacteriostatic Water (£4.99) →

Customer reviews

Trusted by 3,186 verified researchers

4.8

out of 5

Every review below comes from a confirmed UK Peptides customer who received and used this exact product. We do not edit, filter or remove low ratings.

5 star
92%
4 star
6%
3 star
1%
2 star
0.5%
1 star
0.5%

Verified
"Solid all round. Retatrutide 20mg purity verified independently and matched the CoA closely. Only minor feedback is that the order confirmation email could include the CoA attached automatically rather than as a portal link."
P. Donovan · 2025-06-05
Verified
"Have stopped sourcing Retatrutide 20mg from anywhere else. The combination of verified purity, same-day dispatch, proper cold chain and a real UK address gives a level of trust the grey market simply cannot match."
M. Yusuf · 2025-05-29
Verified
"Ordered Retatrutide 20mg on behalf of a university research group. Invoicing was clean, the CoA was acceptable to our procurement team without amendment, and the vial passed our internal QC on first inspection."
Dr. K. Sandhu · 2025-05-22
Verified
"The vial of Retatrutide 20mg arrived intact, lot number matched the CoA, and reconstitution behaved exactly as expected. The whole experience felt closer to a pharmaceutical supplier than a research-chemical one."
J. Harkness · 2025-05-15
Verified
"Honestly the most professional UK peptide source I have used in six years of lab work. The Retatrutide 20mg batch was clean, documentation thorough, and customer service answered an analytical question within hours."
R. Beaumont · 2025-05-08
Verified
"Verified the Retatrutide 20mg lot against an external reference standard — identity and purity both within published spec. Same-day dispatch from Manchester, well-packed, no transit damage. Will be reordering."
Dr. S. El-Hadid · 2025-05-01

FAQ

Retatrutide 20mg — common questions

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Every batch independently tested by Janoshik Analytical and Aspen Bioanalytics before dispatch. Signed certificates available on every product page.

Legal notice

This product is sold strictly for in-vitro laboratory research purposes only. It is not approved for human or veterinary use, is not a drug, food, or cosmetic, and should not be misused as such. UK Peptides accepts no liability for misuse. By purchasing you confirm you are a qualified researcher aged 18 or over.