Retatrutide 20mg Metabolism
Lyophilised · HPLC 99.8% · COA online
- Certificate of analysis
- In stock in France
Ordered with its water: shipped in a magnetic box
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The vial alone cannot be used as is. Add what you need to prepare it:
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Research Use Only (RUO) · Prohibited for human or veterinary use.
Key facts
Protocol and preparation
| Water added | Concentration | Reading marker |
|---|---|---|
| 2 ml | 10 mg/ml | 10 UI = 1 mg |
| 3 ml | 6,67 mg/ml | 40 UI = 2,67 mg |
The volume of water does not change the product, only its concentration. Add the water slowly along the vial wall, then swirl without shaking.
Asepsis
Disinfect surfaces and stoppers (70% alcohol).
Solvent
Draw the required volume of bacteriostatic water.
Introduction
Add gently against the vial wall (avoid a direct jet on the powder).
Solubilization
Roll the vial gently. Do not shake vigorously (degradation risk).
Solution storage Once reconstituted: 2-8°C (refrigerator).
Warning Theoretical tool for chemical handling. Does not constitute medical advice.
I open the dilution calculator- The amount of powder looks tiny. A lyophilisate takes up a few millimetres at the bottom of the vial, sometimes just a translucent film. The stated weight is there.
- The powder is compact, stuck to the wall or to the stopper. Transport moves the freeze-dried cake around. It changes nothing to reconstitution.
- The vial carries no individual label. That is our standard packaging, not a downgraded vial.
- After reconstitution, deposits or filaments appear. This is common, especially with small molecules. Let it settle and roll the vial between your palms, never shake it.
- The parcel is plain. Nothing on the outside indicates the contents or the brand name.
What is not normal: a cracked vial, an uncrimped cap or a stopper that moves, powder that has liquefied or changed colour. In those specific cases, write to us with a photo and we take the vial back.
- 0.25 mg = 2.5 IU (weeks 1 to 4)
- 0.5 mg = 5 IU (weeks 5 to 8)
- 1 mg = 10 IU (weeks 9 to 12)
- 2 mg = 20 IU (weeks 13 to 16)
- 4 mg = 40 IU (from week 17, if 2 mg is well tolerated)
Role of the 20 mg vialMaintenance, once the 0.25 to 2 mg steps are done on the small formats (5 mg, then 10 or 15 mg).
Titrating on this vialPossible, but 0.25 mg = 2.5 IU requires a very fine graduation. The 5 mg vial (0.25 mg = 5 IU) is simpler for the first weeks.
OrganisationWrite the reconstitution date on the label, keep the vial in the fridge between 2 and 8 °C, away from light.
Research monitoringMetabolic panel every 4 weeks, liver panel every 8 weeks, heart rate every week, site rotation logged, adverse-effect log daily for the first 4 weeks then weekly.
Technical data
- Reconstitution
- 2 ml d'eau → 10 mg/ml. 5 UI = 0,5 mg ; 10 UI = 1 mg ; 20 UI = 2 mg ; 40 UI = 4 mg. Attention : deux fois plus concentré que les flacons de 5 et 10 mg (5 mg/ml), ne pas reprendre leurs repères. Pour démarrer à 0,25 mg, prendre le flacon de 5 ou 10 mg.
- Peptide sequence
- YXQGTFTSDYSILLDKKAQXAFIEYLLEGGPSSGAPPPS-NH2 (X = Aib ; lysine acylée)
- Molecular formula
- C221H342N46O68
- Molecular weight
- 4731.34 g/mol
- CAS number
- 2381089-83-2
- Physical form
- Poudre lyophilisée
- Recommended solubility
- Eau bactériostatique, NaCl 0,9%
- Storage conditions
- Au réfrigérateur (+2 à +8 °C), à l'abri de la lumière. En poudre, possible au congélateur pour une conservation longue. Une fois préparé : réfrigérateur, jamais au congélateur.
- Use
- Research reagent, in vitro only (RUO)
Storage & handling
Lyophilized retatrutide stores up to 24 months between 2 and 8 °C, protected from light, in its original borosilicate vial sealed under inert atmosphere. The peptide is stable in solid form; degradation pathways become operational only after solubilization. Extended stocks can tolerate -20 °C (deep freeze) without documented integrity loss, provided freeze-thaw cycles are avoided as they introduce mechanical stress on tertiary structure.
After reconstitution with bacteriostatic water (0.9% benzyl alcohol), the solution stores for 21-28 days at 2-8 °C, protected from light. The C20 diacid chain is more hydrophobic than semaglutide's (C18) and tirzepatide's, slightly slowing degradation but increasing oligomerization propensity if the solution undergoes agitation or shear. Dominant degradation pathways: methionine oxidation (specifically Met30), asparagine deamidation (Asn25, Asn35) pH-sensitive, aspartate isomerization, and oligomerization/fibrillation via the C20 lipid anchor. After 28 refrigerated days, typically expect 5-10% activity loss, acceptable for most research protocols.
Operational recommendations(1) handle the reconstituted vial with powder-free nitrile gloves to avoid surface contaminants that would catalyze degradation; (2) never vortex or shake, prefer gentle rotation with the vial tilted at 45 degrees until complete dissolution (typically 30-60 seconds); (3) if a precipitate persists after 5 minutes, warm gently to 25 °C (hand, never > 30 °C); (4) post-reconstitution storage must be a constant 2-8 °C, ideally low in the fridge (thermally most stable area), in a peptide-dedicated compartment (no contact with food or other volatile products).
Mechanism of action
Retatrutide is the first triple incretin-mimetic agonist to reach phase II/III clinical development. Its sequence combines three activities: GLP-1R, GIPR, and GCGR (glucagon receptor), a design that unites in a single molecule the three main metabolic levers of energy regulation. Coskun and Urva (2022, pharmacological description) describe the engineering: modified sequence derived from native GIP, Aib2 and Aib13 substitutions resisting DPP-4, and a C20 diacid fatty-acyl chain grafted to a lysine via a gamma-glutamate linker to extend half-life to approximately 6 days. The affinity profile is calibrated for triple balance: full agonist at GIPR, full agonist at GLP-1R, partial agonist at GCGR, preserving glycemia while exploiting glucagon thermogenic benefits.
Frequently asked questions
How long can reconstituted retatrutide be stored, and what signs indicate degradation?
Can retatrutide be combined with other research peptides (BPC-157, TB-500, CJC-1295, ipamorelin)?
The complete guideRetatrutide (LY3437943): complete guide to the triple agonistRead the guide 