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Reconstitution · Retatrutide
Pick the vial, the water you added and the dose. Get the exact draw in units for the syringe in your hand.
Step 1 of 4
This vial holds 20 mg in total.
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
20.0 units on a U-100 insulin syringe · 1 mL · lines every 2 units, which is 0.20 milliliters. The draw lands on a syringe line.
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Retatrutide is an experimental weekly injection being tested for weight loss. It acts on three hormone signals linked to appetite and metabolism. People buy unapproved versions under the nickname Reta in hopes of losing weight.
A published phase 2 trial found large average weight loss. Phase 3 trials are underway, but FDA has not approved retatrutide.
Each row starts with the same 20 mg vial and changes only the amount of water. More water makes the mixture less concentrated, so the same dose uses more syringe units.
| Water added | Concentration | Per U-100 unit | Draw for 2 mg | Nearest syringe line |
|---|---|---|---|---|
| 1 mL | 20.00 mg/mL | 200.0 mcg | 10.0 u · 0.100 mL | exactly 10 u |
| 2 mL | 10.00 mg/mL | 100.0 mcg | 20.0 u · 0.200 mL | exactly 20 u |
The vial, water and dose shown here are the calculator’s starting example for Retatrutide. Replace them with your own values. Every result in the table is calculated from those inputs.
Retatrutide’s trial arms span more than tenfold, and one mixed vial has to serve all of it. The water volume that suits the top of the range makes the bottom hard to read.
No approved retatrutide product exists, in any country, in any form. So there is no label to read, no pharmacy strength to match and no diluent volume anyone has settled on. The vial sizes and water volumes on this page are the ones sellers actually ship.
That absence is worth sitting with before the arithmetic starts. Everything below is exact. None of it is official.
The trial arms ran from a low starting amount to several times that. Mix the largest vial into the least water and the top arm draws a small, tidy number. The low arm then lands near the first syringe line. Mix into more water and the low arm becomes readable while the top arm climbs toward the end of the barrel.
The trial moved people upward in steps over months. Someone following that shape needs both ends legible from one vial. That is a real trade-off, and it is why the whole worked table matters more here than any single row of it.
Retatrutide unit counts circulate widely. They almost never travel with the vial size and water volume that produced them, and without both the number means nothing.
Two people can hold the same dose in milligrams and read it several units apart. Both of them are right. Only the milligrams are the dose. The units describe somebody’s vial.
Every dose figure on this page traces back to one published trial. The quantity in the tool at load is not one of that trial’s arms. The arms’ own notes name it as the amount people started from before reaching them.
The page’s dose entry gives a range. Its two ends are the lowest and highest amounts the trial gave anybody.
Every dose figure here rests on a single citation. It sits at the tier this site gives trial evidence rather than labels.
The trial did not publish a half-life, so repeated-dose build-up cannot be calculated reliably and is not shown.
Mix 20 mg into 2 mL and one U-100 unit carries 100.0 mcg. The table shows how much peptide is in each numbered syringe line. These are conversion examples, not suggested doses.
| U-100 line | Volume | Mass (mcg) | Mass (mg) |
|---|---|---|---|
| 10 u | 0.10 mL | 1,000 mcg | 1 mg |
| 20 u | 0.20 mL | 2,000 mcg | 2 mg |
| 30 u | 0.30 mL | 3,000 mcg | 3 mg |
| 40 u | 0.40 mL | 4,000 mcg | 4 mg |
| 50 u | 0.50 mL | 5,000 mcg | 5 mg |
| 60 u | 0.60 mL | 6,000 mcg | 6 mg |
| 70 u | 0.70 mL | 7,000 mcg | 7 mg |
| 80 u | 0.80 mL | 8,000 mcg | 8 mg |
| 90 u | 0.90 mL | 9,000 mcg | 9 mg |
| 100 u | 1.00 mL | 10,000 mcg | 10 mg |
The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.
What a studied retatrutide figure is, and what it is not
What retatrutide is, how it is used, and what has been studied
When retatrutide reactions tend to appear
What the retatrutide draw needs from bacteriostatic water
The Hospira vial for a retatrutide vial
Buying the mixing water before the retatrutide arithmetic starts