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Retatrutide Dosage Calculator

Retatrutide (GLP RTA) is supplied by PX1 Research as a lyophilised powder in 10 mg, 15 mg, 20 mg and 30 mg vials. Because the vial holds a fixed mass, the bacteriostatic water volume you add sets the concentration and therefore how many syringe units any given research dose works out to.

The formula

Concentration (mg/mL) = vial strength (mg) ÷ bacteriostatic water (mL). Draw volume (mL) = dose (mg) ÷ concentration (mg/mL). On a U-100 insulin syringe, units = draw volume (mL) × 100. For Retatrutide: a 10 mg vial in 2 mL of water is 5 mg/mL, so a 2 mg dose is 0.4 mL — 40 units.

Your Retatrutide vial

1 mg = 1,000 mcg

Syringe size

Your result

Draw to

40

units on a U-100 insulin syringe

= 0.4 mL

Concentration
5mg/mL
5,000 mcg/mL
Draws per vial
5
at 2000 mcg each

For laboratory and research use only. This calculator is a unit-conversion aid and is not medical guidance or a dosing recommendation.

Buy Retatrutide — 99%+ purity, COA per lot

Retatrutide units per dose — quick reference

U-100 insulin-syringe units for each vial size we ship, reconstituted with 2 mL of bacteriostatic water.

Retatrutide insulin syringe units per dose by vial size
VialConcentration500 mcg1 mg2 mg4 mg
10 mg5 mg/mL10 u20 u40 u80 u
15 mg7.5 mg/mL6.7 u13.3 u26.7 u53.3 u
20 mg10 mg/mL5 u10 u20 u40 u
30 mg15 mg/mL3.3 u6.7 u13.3 u26.7 u

How to reconstitute a Retatrutide vial

  1. 1. Bring the vial to room temperature. Let a refrigerated or frozen vial equilibrate before opening so condensation doesn't form on the powder.
  2. 2. Swab both stoppers. Wipe the Retatrutide vial and the bacteriostatic water vial with alcohol and let them dry.
  3. 3. Draw your diluent. Pull the volume you entered above into the syringe.
  4. 4. Run it down the glass wall. Angle the needle so water flows down the side of the vial rather than jetting onto the peptide cake — shear and foaming degrade peptides.
  5. 5. Swirl, never shake. Roll the vial gently until fully clear. Do not vortex or shake.
  6. 6. Label and refrigerate. Mark the date and concentration, then store at 2-8 °C away from light.

Retatrutide calculator FAQs

How many units is 2 mg of retatrutide from a 10 mg vial?

A 10 mg vial reconstituted with 2 mL of bacteriostatic water is 5 mg/mL. A 2 mg draw is 0.4 mL, which is 40 units on a U-100 insulin syringe, and the vial holds 5 such draws.

How much bacteriostatic water should be used with a 10 mg retatrutide vial?

2 mL is the most common choice in research protocols because it produces a round 5 mg/mL solution and keeps typical draws inside a 0.5 mL syringe. Using 1 mL doubles the concentration and halves the units; using 3 mL does the reverse.

How do you calculate a Retatrutide dose in syringe units?

Divide the vial strength by the bacteriostatic water you added to get the concentration: concentration (mg/mL) = vial mg ÷ water mL. Then draw volume (mL) = dose (mg) ÷ concentration. On a U-100 insulin syringe, 1.0 mL is 100 units, so units = draw volume × 100.

Does adding more water change how much Retatrutide is in the vial?

No. The vial holds a fixed mass of lyophilised powder. More bacteriostatic water only dilutes it — each syringe unit carries less compound and the draw volume for the same dose gets larger, which can make small doses easier to measure accurately.

How is reconstituted Retatrutide stored?

After reconstitution with bacteriostatic water, research peptides are kept refrigerated at 2-8 °C, protected from light, and away from freeze-thaw cycles. Unreconstituted lyophilised vials are far more stable and are typically stored frozen.

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