Guide

Retatrutide reconstitution and storage

Retatrutide's numbers in one place: mass, the three receptors it targets, six vial sizes, concentration table and what its report should show.

Published September 4, 2026

Retatrutide is the triple agonist of the group: GLP-1, GIP and glucagon, in one 4,731 g/mol molecule.

Peptide	Vial sizes	From
Retatrutide	5mg, 10mg, 20mg, 30mg, 40mg, 50mg, 60mg	$53.99 CAD
Tirzepatide	5mg, 10mg, 15mg, 20mg, 30mg, 40mg, 50mg, 60mg	$42.99 CAD
Semaglutide	5mg, 10mg, 20mg, 30mg	$42.99 CAD

Free shipping across Canada. Every vial ships with a QR code linking to its own batch lab report. See all peptides

Identity


Formula	C221H342N46O68
Molecular weight	4731.32 g/mol
CAS	2381089-83-2
Receptors	GLP-1, GIP, glucagon
Vial sizes we sell	5, 10, 20, 30, 40, 50 mg

Adding a third receptor did not make the molecule dramatically bigger. Retatrutide is actually lighter than tirzepatide, by 82 g/mol. Receptor count and molecular weight are not correlated; sequence design decides both independently.

Concentration

Vial	1 mL	2 mL	3 mL	5 mL
5 mg	5 mg/mL1.06 mM	2.5 mg/mL0.528 mM	1.67 mg/mL0.352 mM	1 mg/mL0.211 mM
10 mg	10 mg/mL2.11 mM	5 mg/mL1.06 mM	3.33 mg/mL0.705 mM	2 mg/mL0.423 mM
20 mg	20 mg/mL4.23 mM	10 mg/mL2.11 mM	6.67 mg/mL1.41 mM	4 mg/mL0.845 mM
30 mg	30 mg/mL6.34 mM	15 mg/mL3.17 mM	10 mg/mL2.11 mM	6 mg/mL1.27 mM
40 mg	40 mg/mL8.45 mM	20 mg/mL4.23 mM	13.3 mg/mL2.82 mM	8 mg/mL1.69 mM
50 mg	50 mg/mL10.6 mM	25 mg/mL5.28 mM	16.7 mg/mL3.52 mM	10 mg/mL2.11 mM
60 mg	60 mg/mL12.7 mM	30 mg/mL6.34 mM	20 mg/mL4.23 mM	12 mg/mL2.54 mM

Retatrutide vial sizes we sell, at four diluent volumes. Molarity uses 4731.32 g/mol. Other volumes

A 10 mg vial is about 2.11 micromoles. The retatrutide calculator has all six sizes.

Handling

Water down the inside wall, swirl, never shake. Dry powder in the freezer at -20°C; solution in the fridge, aliquoted if you need to freeze it. Reconstitution and storage guides have the detail.

On the report

Observed mass near 4731.32, HPLC purity at 99% or higher, matching batch number, named lab. The 82 g/mol gap to tirzepatide is wide enough to resolve cleanly at this mass, so a report should be unambiguous. If it is not, that is a reason to ask.

Scan the QR on the vial or enter the batch code. Before you order, the Lab Reports tab on the product page sends you the latest batch's report by email.

Where it sits among the three

Three receptors, the most of the group. Semaglutide vs tirzepatide vs retatrutide puts all three side by side.

Every retatrutide vial from pepuro ships free, from our Calgary, Toronto and Vancouver distribution centers, the same business day your e-Transfer clears, with a QR code on the vial that opens its independent, third-party lab report.

For research use only. Not for human or animal consumption.

Frequently asked questions

What is the molecular weight of retatrutide?

4731.32 g/mol, formula C221H342N46O68. It sits between semaglutide and tirzepatide in mass.

Which receptors does retatrutide target?

Three: GLP-1, GIP and the glucagon receptor. That is what makes it a triple agonist and what separates it from the single and dual agonists.

How much water do I add to a 10 mg retatrutide vial?

1 mL gives 10 mg/mL, 2 mL gives 5 mg/mL, 5 mL gives 2 mg/mL.

Which retatrutide vial sizes are available?

5, 10, 20, 30, 40 and 50 mg.

Ready to source from Canada's most transparent peptide store?

Browse peptides