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Retatrutide Reconstitution Calculator

Calculate exact injection volumes for retatrutide. Pre-filled for a 10mg vial with 2ml BAC water. Adjust for your vial size.

Dose Reference Table

Pre-calculated for a 10mg vial + 2ml BAC water = 5,000 mcg/ml concentration. Using a 100-unit (1ml) insulin syringe.

Dose Inject Volume (ml) Syringe Units
1000mcg (1mg) 0.200 ml 20 units
1500mcg (1.5mg) 0.300 ml 30 units
2000mcg (2mg) 0.400 ml 40 units
2500mcg (2.5mg) 0.500 ml 50 units
3000mcg (3mg) 0.600 ml 60 units
4000mcg (4mg) 0.800 ml 80 units

About Retatrutide

Retatrutide is a triple receptor agonist targeting GIP, GLP-1, and glucagon receptors simultaneously — making it one of the most potent investigational compounds for metabolic research. In clinical trials, retatrutide demonstrated exceptional efficacy for body weight reduction, outperforming dual agonists in preliminary data.

Unlike semaglutide (GLP-1 only) or tirzepatide (GIP + GLP-1), retatrutide's addition of glucagon receptor activity is thought to contribute to enhanced thermogenesis and energy expenditure on top of appetite suppression.

Retatrutide is typically supplied in 5mg, 10mg, or 20mg vials. The standard reconstitution approach is 2ml of bacteriostatic water per 10mg vial, yielding a concentration of 5,000 mcg/ml. At this concentration, a 2mg (2000mcg) dose requires 0.4ml — or 40 units on a standard 100-unit insulin syringe.

Researchers typically administer retatrutide via weekly subcutaneous injection, starting at lower doses and escalating gradually. The half-life of approximately 6 days supports once-weekly dosing.

Vial will last calculation: Divide your total vial content (e.g. 10mg = 10,000mcg) by your weekly dose to determine how many weeks a vial will last. At 2mg/week from a 10mg vial: 10,000 ÷ 2,000 = 5 weeks per vial.

Frequently Asked Questions

The standard recommendation is 2ml of bacteriostatic water for a 10mg retatrutide vial. This gives a concentration of 5,000 mcg/ml. At this concentration, a 2mg (2000mcg) dose = 0.4ml = 40 units on a 100-unit insulin syringe.
It depends on your weekly dose. At 2mg/week, a 10mg vial lasts 5 weeks. At 1mg/week it lasts 10 weeks. Use the formula: weeks = vial size (mg) ÷ weekly dose (mg).
.5 on a 100-unit insulin syringe = 0.5ml = 50 units. For a 10mg vial + 2ml BAC (5000 mcg/ml), 0.5ml delivers 2500mcg (2.5mg) of retatrutide.
Use a fresh insulin syringe to draw up 2ml of bacteriostatic water. Inject the BAC water slowly into the vial along the side wall — do not inject directly onto the powder. Gently swirl (do not shake) until fully dissolved. Store at 2–8°C.
In clinical research settings, retatrutide has been studied at starting doses of 1–2mg per week, with gradual escalation. Consult a healthcare professional before using any peptide compound.

How Long Will My Retatrutide Vial Last?

Enter your weekly dose to see how many weeks a vial will last.

— Weeks per vial
Semaglutide Calculator Reconstitution for semaglutide vials. Tirzepatide Calculator Reconstitution for tirzepatide vials. BAC Water Calculator Find out how much BAC water to add. Peptide Dosage Chart Quick reference for all peptides.