Retatrutide 30 mg reconstitution calculator
How much bac water for retatrutide 30 mg?
There’s no single right amount: the water sets the strength, not how much retatrutide is in the vial, so use the volume on your pharmacy’s instructions. For example, 1.5 mL makes 20 mg/mL and 2 mL makes 15 mg/mL; the table below shows what each volume means on a U-100 syringe.
Your retatrutide vial
Syringe
1 mL · 2-unit marks
Work backwards
Find the water for a given reading in units.
Enter your numbers to see the result.
Enter your numbers
This is arithmetic, not medical advice. Confirm with your prescriber or pharmacist.
How our calculator worksAdvanced
Vial capacityOptional
The volume printed on the vial or its box, not the mg. We’ll tell you if the water won’t fit.
What each volume makes
| Water | Strength | Each unit | 1 mg is |
|---|---|---|---|
| 1.5 mL | 20 mg/mL | 200 mcg | 5 units |
| 2 mL | 15 mg/mL | 150 mcg | 6.7 units |
| 3 mL | 10 mg/mL | 100 mcg | 10 units |
Examples; use the volume on your pharmacy’s instructions. Units are on a U-100 syringe: 100 units = 1 mL.
About the 30 mg vial
Same strength, different vial sizes
30 mg in 3 mL is 10 mg/mL (100 mcg per unit), the same as the 10 mg vial in 1 mL, the 15 mg vial in 1.5 mL and the 20 mg vial in 2 mL. 30 mg in 1.5 mL is 20 mg/mL (200 mcg per unit), the same as the 20 mg vial in 1 mL. Units carry over between vial sizes only at equal strength. With 2 mL this vial is 15 mg/mL, three times the 10 mg vial with the same water, so the same reading holds three times the mg.
Three times the draws, open for longer
A 30 mg vial holds three times what a 10 mg vial holds, so the same prescription takes three times as many draws and the vial stays in use far longer. The FDA generally recommends that vials holding multiple doses of a sterile medication be used within 28 days after first use, because the risk of contamination rises after that (FDA). Retatrutide has no label, so nothing official gives this vial a beyond-use date once mixed. Use the doses-per-vial figure in the calculator to count the draws your prescribed amount gives, and ask a pharmacist how long the mixed vial can be kept.
Sources for these notes
About retatrutide
US regulatory status
Investigational, not approved
Retatrutide is not approved by the FDA for any use and has no brand name. Eli Lilly published phase 3 trials in 2026, but no FDA filing or approval had been announced as of October 16, 2026. The FDA says retatrutide cannot be used in compounding, and it has warned telehealth companies, ingredient distributors and websites selling “research use only” retatrutide.
As of
Sources (7)
- Novel Drug Approvals for 2026U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Retatrutide, a Triple Hormone Receptor Agonist, for Treatment of ObesityN Engl J Med, 2026 (opens in a new tab)
- Retatrutide in adults with obesity and type 2 diabetes (TRIUMPH-2): a double-blind, parallel-group, randomised, placebo-controlled, phase 3 trialLancet, 2026 (opens in a new tab)
- A Study of Retatrutide (LY3437943) in Participants Who Have Obesity or Overweight (TRIUMPH-1), NCT05929066ClinicalTrials.gov, 2026 (opens in a new tab)
- FDA’s Concerns with Unapproved GLP-1 Drugs Used for Weight LossU.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: Gram Peptides (MARCS-CMS 721806)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: TXP Innovations LLC dba Tex Peptides (MARCS-CMS 735067)U.S. Food and Drug Administration, 2026 (opens in a new tab)
How this retatrutide calculator works
This calculator starts from the 30 mg in your vial. Add the water you mix it with and the dose your prescriber gave you; it divides the mg by the mL to get the strength, then turns your dose into mL and units on a 30, 50 or 100-unit syringe.
Peptinote never suggests a dose or a water volume. The example volumes are there to make the math easy to check, not as advice. For the full method, see the peptide calculator.
Questions people ask
How much bac water goes in 30 mg of retatrutide?
There’s no single right amount: use the volume on your pharmacy’s instructions. The water only sets the strength; the vial still holds 30 mg however much you add. With 1.5 mL it’s 20 mg/mL (200 mcg per unit), with 2 mL 15 mg/mL (150 mcg per unit) and with 3 mL 10 mg/mL (100 mcg per unit). Enter your volume and prescribed dose above to get the units. This product isn’t FDA-approved, so no official label sets a water volume and its contents aren’t verified.
How do I reconstitute 30 mg of retatrutide?
Wipe both stoppers with alcohol and let them dry. Draw the volume of bacteriostatic water your pharmacy specifies into a new syringe, add it slowly down the inside of the vial, then swirl gently until clear; don’t shake. Label it with the strength: 30 mg in 1.5 mL is 20 mg/mL. Full steps: how to reconstitute peptides.
What are the steps to reconstitute retatrutide 30 mg?
Mixing your retatrutide 30 mg vial takes the bacteriostatic water your pharmacy specifies and a new sterile syringe. Add the water slowly against the glass and swirl, never shake, until the liquid is clear. If it stays cloudy or has particles, don’t use it; call your pharmacy. Then write the strength and date on the vial and store it as the label says (how to store peptides).
Is there a retatrutide bac water calculator?
This page is the retatrutide 30 mg reconstitution calculator. Enter the water you add (or tap an example volume) and your prescribed dose, and it shows the units to draw on a 30, 50 or 100-unit syringe, the strength, and the doses in the vial, with every step of the math. It never suggests a dose.
How much bac water per mg of retatrutide?
Water isn’t added per mg; it sets the strength of the whole vial. mL per mg = water ÷ vial mg, so 1.5 mL in this 30 mg vial is 0.05 mL (5 units) per mg, 2 mL in this 30 mg vial is 0.067 mL (6.7 units) per mg and 3 mL in this 30 mg vial is 0.1 mL (10 units) per mg. The water volume comes from your pharmacy’s instructions. This product isn’t FDA-approved, so no official label sets a water volume and its contents aren’t verified.
Can Peptinote tell me how many units to take?
No. Peptinote never suggests a dose. Enter the dose your prescriber gave you, and the calculator shows how to measure it: the units, the mL and where the line sits on your syringe, with every step of the math. If you aren’t sure what your dose is, ask your prescriber or pharmacist before drawing anything. How our calculator works.
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Every result is plain arithmetic from formulas we publish in full and check with automated tests. Peptinote doesn’t suggest doses and never sells or links to sellers of peptides.