How to mix Retatrutide
Reconstitution is the step where most peptide is wasted. This is the exact procedure for a 30 mg Retatrutide vial, including the arithmetic that turns milligrams into syringe units.
Open the dosage calculatorWhat you need
- One 30 mg lyophilised Retatrutide vial
- Bacteriostatic water (10 mL multi-use vial)
- One luer-lock syringe for transferring water
- U-100 insulin syringes (31G) for measuring doses
- Alcohol prep pads
Step by step
- 1Wipe both rubber stoppers with an alcohol pad and let them dry.
- 2Draw 3 mL of bacteriostatic water into the luer-lock syringe.
- 3Insert the needle into the Retatrutide vial and inject the water slowly against the inside wall of the glass — never straight onto the powder, which causes foaming.
- 4Swirl gently. Never shake. Wait until the solution is completely clear.
- 5Label the vial with the date it was reconstituted and return it to the fridge.
30 mg ÷ 3 mL = 10 mg/mL. Every dose calculation on this page follows from that single number.
Converting milligrams to syringe units
A U-100 insulin syringe is marked in units where 100 units = 1 mL. At 10 mg/mL, 1 mg = 0.1 mL = 10 units.
| Target dose | Volume | U-100 units |
|---|---|---|
| 0.5 mg | 0.05 mL | 5 units |
| 1 mg | 0.1 mL | 10 units |
| 2 mg | 0.2 mL | 20 units |
| 4 mg | 0.4 mL | 40 units |
| 8 mg | 0.8 mL | 80 units |
Common mistakes
- Using plain sterile water for a vial you plan to draw from repeatedly — it has no preservative.
- Shaking instead of swirling, which shears the peptide.
- Injecting water directly onto the powder cake and foaming the vial.
- Reconstituting at a concentration that makes your smallest dose unreadable on the syringe.
- Leaving the reconstituted vial at room temperature between uses.
Frequently asked questions
How much bacteriostatic water for a 30 mg Retatrutide vial?
3 mL is the common choice because it produces a clean 10 mg/mL concentration, where 1 mg equals 10 units on a U-100 insulin syringe.
How long does reconstituted Retatrutide last?
Stored refrigerated at 2–8 °C and protected from light, reconstituted peptide is generally treated as usable for several weeks. Never freeze it and never leave it warm.
Can I reconstitute with 1.5 mL instead?
Yes — that gives 20 mg/mL. The trade-off is that every dose halves in volume, so small steps become harder to measure precisely on a U-100 syringe.
Every vial ships with its own published certificate.
Purity, quantity, and endotoxin tested by Janoshik Analytical, published before the product goes on sale.
Still have a question?
Message our support team on WhatsApp at +63 947 174 7187.
Continue reading
Bacteriostatic water guide
Bacteriostatic water is water with 0.9% benzyl alcohol added as a preservative. That preservative is the entire reason it can be drawn from more than once.
Insulin syringe guide
Almost every dosing error in peptide research traces back to the syringe: units confused with millilitres, or a barrel too large to read a small dose.
Peptide calculator
One calculator handles every peptide, because the arithmetic never changes — only the numbers you put into it.
All Origen products are supplied for laboratory research use only and are not for human or veterinary consumption. Nothing on this page is medical advice. Last updated 2026-08-03.