Research use only — not for human consumption Batch 24-B released 14.07.26 · UK & EU dispatch within 24h
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Catalogue / Metabolic research / Retatrutide
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In stock UK dispatch 24h Batch 24-B

Retatrutide

GLP-1 / GIP / glucagon triple agonist · 4731.3 g/mol · CAS 2381089-83-2
Buy Retatrutide in the UK — a GLP-1 / GIP / glucagon triple receptor agonist supplied as a lyophilised powder for laboratory research. HPLC verified with a downloadable certificate of analysis.
99.2%
HPLC purity
4731.3
g/mol
Pass
Mass spec ID
Vial size
Open dosing calculator →

What is Retatrutide?

Retatrutide (LY3437943) is a synthetic 39-amino-acid peptide that acts as a triple agonist at the GLP-1, GIP and glucagon receptors. It is studied in metabolic research as a single molecule engaging three incretin pathways simultaneously, and is supplied here as a lyophilised powder for in-vitro laboratory investigation only.

Each vial is produced by solid-phase peptide synthesis, purified by reverse-phase HPLC and verified by mass spectrometry before release. Purity and identity for the batch you receive are published on the certificate of analysis above.

Retatrutide reconstitution reference

Reconstitute with bacteriostatic water. The table shows the concentration and syringe volume produced by common dilutions of a 10mg vial, for reference when preparing research stock solutions.

Bac water addedConcentration250 mcg =500 mcg =
1 ml10 mg/ml2.5 units5 units
2 ml5 mg/ml5 units10 units
3 ml3.33 mg/ml7.5 units15 units
5 ml2 mg/ml12.5 units25 units
Units measured on a standard U-100 insulin syringe (100 units = 1 ml). For other vial sizes use the peptide reconstitution calculator.

Storage & handling

Before reconstitution
Store lyophilised at −20 °C, protected from light. Stable for 24 months or longer in the sealed vial.
After reconstitution
Store at 2–8 °C and use within 28 days. Avoid repeated freeze-thaw cycles; aliquot where possible.

Frequently asked questions

Is Retatrutide third-party tested?

Yes. Every batch is tested by an independent laboratory for HPLC purity and mass-spectrometry identity. The certificate for the batch you receive is linked on this page before you buy — no account needed.

How should I reconstitute Retatrutide?

Add bacteriostatic water slowly down the inside wall of the vial, aimed away from the powder, then swirl gently until clear. Never shake. Use the reconstitution calculator to work out the volume for your target concentration.

How long does Retatrutide last once reconstituted?

Refrigerated at 2–8 °C and protected from light, a reconstituted vial is generally used within 28 days. Unopened lyophilised powder stored at −20 °C is stable far longer.

How quickly does it ship?

Orders placed before 3pm on a working day are dispatched the same day by Royal Mail 24h tracked. EU orders go by DPD, typically 3–5 working days.

Specification
CAS2381089-83-2
SynonymLY3437943
Mol. weight4731.3 g/mol
Residues39 amino acids
FormLyophilised powder
SolventBacteriostatic water
FormLyophilised powder, sterile vial
Storage−20 °C, protect from light
Reconstitution2 mL bacteriostatic water
Stability28 days at 2–8 °C reconstituted
ShippingUK 24h tracked · EU 3–5 days
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Research guides
How to reconstitute a lyophilised peptideHow to store research peptidesHow to read a certificate of analysisBacteriostatic water vs sterile waterAre research peptides legal in the UK?
Supplied strictly as a laboratory reference material for in-vitro research. Not a medicine, food or cosmetic. Not for human or veterinary consumption, diagnostic or therapeutic use.