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For the GLP-3RT (Retatrutide) 30 mg vial. Enter the bacteriostatic water you add and the amount you want, and see exactly where to draw on the syringe, in units and mL.
1 mg = 1,000 mcg. Type any amount, or tap a common one.
Almost all insulin-style syringes are U-100. Check the packaging if you're not sure.
Draw to
| In each draw | Amount |
|---|
What each mark on the syringe holds with this mix.
Retatrutide (sold here as GLP-3RT 30 mg) is a triple-receptor agonist studied in metabolic research for its activity at GLP-1, GIP and glucagon receptors. It comes as a 30 mg lyophilized vial, which is a much higher strength than most single peptides.
That higher strength is why the amount is usually expressed in milligrams, not micrograms. With 3 mL of bacteriostatic water the vial is 10 mg/mL, so each unit on a U-100 syringe holds exactly 0.1 mg. That is the simplest mix to work with for this compound. For laboratory research use only.
View GLP-3RT (Retatrutide) 30 mg Read the Retatrutide research guide All peptides calculator
Every reconstitution calculator uses the same three steps. Here they are in plain numbers, so you can check any result by hand.
mg in vial ÷ mL of water = mg/mL30 mg + 3 mL of bacteriostatic water = 10 mg/mL. The water changes the strength, not the amount of peptide.
amount you want ÷ strength = mLFor 2 mg: 2 ÷ 10 = 0.2 mL.
mL × 100 = units (U-100)0.2 mL × 100 = 20 units. On a U-100 syringe, 1 unit is always 0.01 mL, whatever the barrel size.
Same vial, different amounts of water. More water spreads the same peptide across more liquid, so each mark holds less and draws get bigger.
| Water added | Strength | 10 units holds | 2 mg = |
|---|---|---|---|
| 1 mL | 30 mg/mL | 3 mg | 6.7 units |
| 2 mL | 15 mg/mL | 1.5 mg | 13.3 units |
| 3 mL | 10 mg/mL | 1 mg | 20 units |
| 5 mL | 6 mg/mL | 600 mcg | 33.3 units |
Each one opens with the right vial size and shows the numbers for that peptide.
There is no single correct amount: water changes the strength, not how much peptide is in the vial. For example, with 2 mL the vial is 15 mg/mL and every 10 units holds 1.5 mg; with 3 mL the vial is 10 mg/mL and every 10 units holds 1 mg. More water makes each draw larger and easier to measure. A common choice for this vial is 3 mL.
With 3 mL of water in the 30 mg vial, 2 mg is 20 units (0.2 mL) on a U-100 syringe. A different amount of water gives a different answer, so enter your own numbers in the calculator above.
At 2 mg per draw there are 15 draws (30 mg ÷ 2 mg). The water amount does not change this number, only the size of each draw.
Plan on about one week in the fridge (2–8°C) as a conservative standard. For longer, split the solution into single-use portions and freeze them, avoiding repeated freeze-thaw cycles. Keep the unmixed powder cold, dry and dark.
mcg and mg measure how much peptide you have (1 mg = 1,000 mcg). mL measures liquid. Units are just the markings on an insulin-style syringe: on a U-100 syringe, 1 unit = 0.01 mL, so 100 units = 1 mL.
No. 0.3 mL, 0.5 mL and 1 mL insulin syringes are all U-100: 1 unit is always 0.01 mL. Only the barrel size changes. Smaller barrels have finer markings, which makes small draws easier to read.
More detail: Reconstitution guide · Storage guide
Research peptides, blends and the bacteriostatic water to mix them.
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