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 | $53.99 CAD |
| Tirzepatide | 5mg, 10mg, 15mg, 30mg, 40mg, 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 |
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.
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 Calgary, the same business day your e-Transfer clears, with a QR code on the vial that opens its Janoshik Analytical 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.
Related articles
- Tirzepatide vs Retatrutide: dual agonist or triple?Both are 39 residues with a C20 fatty chain. Retatrutide adds the glucagon receptor and drops 82 daltons. What separates them on paper and on a lab report.
- BPC-157 reconstitution, storage and the lab reportThe numbers for BPC-157 in one place: sequence, mass, vial sizes, concentration at common volumes, and what its lab report should show.
- Cagrilintide vs Semaglutide: amylin analog vs GLP-1 analogThey are paired in research, not interchanged. Cagrilintide acts at amylin and calcitonin receptors; semaglutide at the GLP-1 receptor. Different hormones, different masses.
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